Dr. Andrew Cornelius

Office: BPB-142 Phone: 895-1727 Email: cornel@physics.unlv.edu

View my Group Website at: www.physics.unlv.edu/~cornel/homepage.htm

Associate Professor
HiPSEC & Department of Physics and Astronomy
University of Neavada Las Vegas
4505 Maryland Parkway
Las Vegas NV 89154

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Teaching

For the Fall 2008 Semester, I am teaching:

HON 230 (Scientific World Views), MW 1:00-2:15 in BPB 247

PHY 181 (Engineering Physics 3), TR 1:00-2:15 in BPB 106

Research

My research studies the influence of high pressures and high magnetic fields on the electronic and magnetic properties of metals. This work is done as part of the UNLV High Pressure Science Center .

Education

Ph.D.: Washington University, St. Louis , February 1996

Dissertation: Investigations of Anomalous Ferromagnetism Under High Hydrostatic Pressure in a Diamond-Anvil Cell.

Advisor: Professor James S. Schilling .

B.S.: Physics/Mathematics, Drake University , 1989.

Past Research Experience

• 7/99-Present. Assistant Professor in Physics Department at University of Nevada-Las Vegas . Studying the thermodynamic properties of various systems with an emphasis on correlated-electron materials in applied magnetic fields. Developing capability of measuring magnetization and electrical resistivity in a diamond-anvil cell in high magnetic fields. Continuing de Haas-van Alphen measurements as a visitor to Los Alamos National Laboratory (LANL).

• 10/96-7/99. Postdoctoral research assistant for Dr. Al Arko in Material Science Division at LANL . Determined the Fermi surface of highly correlated electron systems by measuring de Haas-van Alphen effect in pulsed fields to 60 T at NHMFL-LA . Developed rotating probe to do angle-resolved de Haas-van Alphen measurements. Constructed a complete low temperature setup for performing de Haas-van Alphen measurements on transuranic systems.

• 11/95-10/96. Postdoctoral research assistant for Dr. Jon Lawrence in the Physics and Astronomy Department at University of California-Irvine . Studied the thermodynamic, with the primary focus on thermal expansion, hall effect and specific heat, properties of YbInCu 4 and related compounds and CMR materials. Showed that the critical point in the YbIn 1-x Ag x Cu 4 series was due to a sudden change in the carrier density.

• 5/91-10/95. Dissertation work with Professor James S. Schilling in the Physics Department at Washington University, St. Louis . Measured in a diamond-anvil cell the dependence of the magnetic ordering temperature of rare earth and actinide based ferromagnets on very high hydrostatic pressure. Wound and miniaturized small coil systems to measure the a.c. susceptibility. Increased the pressure that can be routinely reached. Developed model to estimate the anisotropic compressibility of copper-oxide based superconductors.

• 6/90-8/90. Research assistant for Dr. David Meitz at 3M in Minneapolis . Mechanical properties of laminated tapes and adhesives were investigated to improve performance and expand possible uses. Results published in internal research report.

• 5/89-8/89. Research assistant for Dr. Donglu Shi at Argonne National Laboratory . Synthesized numerous samples of copper-oxide superconductors. Fabricated samples included bulk, sintered and thick films prepared by a melt anneal technique.

• 5/88-8/88. Research assistant for Dr. L. Scott Chumbley at Ames National Laboratory . Investigated properties of copper-oxide superconductors using electron and optical microscopy. Deduced the quality of samples fabricated by various techniques using a scanning electron microscope. Studied twinning using optical techniques.

Publications

• "Vaitheeswaran, G., Kanchana, V., Kumar, R.S., Cornelius, A.L., Nicol, M.F., Svane, A., Delin, A., Johansson, B. "High-pressure structural, elastic, and electronic properties of the scintillator host material KMgF3." Physical Review B, 76, 014107 (2007).
• Hamlin, J.J., Deemyad, S., Schilling, J.S., Jacobsen, M.K., Kumar, R.S., Cornelius, A.L., Cao,G., Neumeier, J.J. "AC susceptibility studies on the weak itinerant ferromagnet SrRuO3 to 34 GPa." Physical Review B 76, 014432 (2007).
• Kumar, R.S., Kim, E., Tschauner, O., Cornelius, A.L., Sulic, M.P., and Jensen, C.M."Pressure-inducd structural phase transition in NaAlH4" Physical Review B, 75, 174110 (2007).
• Kumar, R.S., Cornelius, A.L., Pravica, M.G., Nicol, M.F., Hu, M.Y., and Chow, P.C. "Bonding changes in single wall carbon nanotubes (SWNT) on Ti and TiH2 addition probed by X-ray Raman Scattering." Diamond and Related Materials, 16, 1136-1139 (2007).
• Kumar, R.S., Pravica, M.G., Cornelius, A.L., Nicol, M.F., Hu, M.Y., and Chow, P.C. "X-ray Raman scattering studies on C-60 fullerenes and multi-walled carbon nanotubes under pressure." Diamond and Related Materials, 16, 1250-1253 (2007).
• "High-pressure structural studies of dysprosium using angle dispersive x-ray diffraction." Shen, Y.R., Kumar, R.S., Cornelius, A.L., Nicol, M.F. Physical Review B, 75, 064109 (2007).
• "High pressure structure of Tb2Ti2O7 pyrocholre at cryogenic temperatures" Kumar, R.S., Cornelius, A.L., Somayazulu, M., Errandonea, D, Nicol, M.F., and Gardner, J. Physica Status Solidi B-Basic Solid State Physics, 244, 266-269 (2007).
• "Equation of state of nanocrystalline BaTiO3 up to 52 GPa at room temperature" Kumar, R.S., Cornelius, A.L., and Nicol, M.F. Physica Status Solidi B-Basic Solid State Physics, 244, 290-294 (2007).
• "Structure of nanocrystalline ZnO up to 85 GPa." R.S. Kumar, A.L. Cornelius, and M.F. Nicol, Curr. App. Phys. 7, 135-8 (2007).
• "High-Pressure Structure of LaSr2Mn2O7 bilayer manganite." A.L. Cornelius, R.S. Kumar, D. Prabhakaran, A. Boothroyd, and M.F. Nicol, J. Phys. Chem. Solids 67, 2046-2050 (2006).
• "Observation of field-induced single impurity behavior in the heavy fermion compound Ce3Co4Sn12." A.L. Cornelius, A.D. Christianson, J.M. Lawrence, V. Fritsch, E.D. Bauer, J.L. Sarrao, J.D. Thompson, and P.G. Paqluiso, Physica B 378-380, 113-4 (2006).
• "Dynamics of diluted Ho spin ice Ho2-xYxTi2O7 studied by neutron spin echo spectroscopy and ac susceptibility." G.Ehlers, J.S. Gardner, C.H. Booth, M. Daniel, K.C. Kam, A.K. Cheetham, D. Antonio, H.E. Brooks, A.L. Cornelius, S.T. Bramwell, J. Lago, W. Haussler, and N. Rosov , Phys. Rev. B 73, 174429-1-6 (2006).
• "Pressure-induced structural transitions in Tb-pyrochlore oxides." R.S. Kumar, A.L. Cornelius, M.F. Nicol, K.C. Kam, A.K. Cheetham, and J.S. Garnder, App. Phys. Letters 88, 31903-1-3 (2006).
• “Antiferromagnetism in Pr 3 In.” A. D. Christianson, J. M. Lawrence, J.L. Zarestky, H. Suzuki, J.D. Thompson, M.F. Hundley, J.L. Sarrao, C.H. Booth, D. Antonio and A.L. Cornelius, Phys. Rev. B 72, 7089-95 (2005).
• “Pressure Induced Structural Phase Transition in AgSbTe 2 .” R. S. Kumar, A.L. Cornelius , E. Kim, Yongrong Shen, S. Yoneda, Chenfeng Chen, and M.F. Nicol, Phys. Rev. Lett 72, 60101-1-4 (2005).
• “Structural Behavior of Non-Oxide Perovskite Superconductor MgCNi 3 at Pressures up to 32 GPa.” R. S. Kumar, A.L. Cornelius , Yongrong Shen, T. G. Kumary, J. Janaki, M. C. Valsakumar and M. F. Nicol, Physica B 363, 190-5 (2005).
• “Perturbing the superconducting planes in CeCoIn 5 by Sn substitution.” M. Daniel, E.D. Bauer, S.-W. Han, C.H. Booth, A.L Cornelius , P.G. Pagliuso, and J.L. Sarrao, Phys. Rev. Lett. 95, 016406/1-4(2005).
• “Local Structure around Sn in CeCoIn 5-x Sn x .” M. Daniel, S.-W. Han, C.H. Booth, A.L Cornelius , E.D. Bauer, and J.L. Sarrao, Physica B 359-361, 401-3(2005)
• “Disturbing the spin liquid state in Tb 2 Ti 2 O 7 : Heat capacity measurements on rare earth titanates.” A.L. Cornelius , B.E. Light, R. S. Kumar, M. Eichenfield, T. Dutton, R. Pepin, and J.S. Gardner, Physica B 359-361, 1243-5(2005).
• “The crystal structure of CeRhIn 5 under pressure.” R.S. Kumar, H. Kohlmann, B.E. Light, A.L Cornelius , V. Raghavan, T.W. Darling, and J.L. Sarrao, Physica B 359-361, 407-9 (2005).
• “X-ray absorption studies of local structure and f-level occupancy in CeIr 1-x Rh x In 5 .” M. Daniel, S.-W. Han, C.H. Booth, A.L Cornelius , P.G. Pagliuso, J.L. Sarrao, and J.D. Thompson, Phys. Rev. B 71 , 054417 (2005).
• “Compressibility of Nb 2 AsC to 41GPa." R. S. Kumar, S. Rekhib, A.L. Cornelius, and M. W. Barsoum, Appl. Phys. Lett. 86, 111904-1-3 (2005).
• “Compressibility of Ce M In 5 and Ce 2 M In 8 ( M = Rh, Ir, and Co) compounds.” R.S. Kumar, A.L. Cornelius , and J.L. Sarrao, Phys. Rev. B 70 , 214526 (2004).
• “Evidence for two distinct spin relaxation mechanisms in ‘hot' spin ice Ho 2 Ti 2 O 7 .” G Ehlers, A. L. Cornelius , T. Fennell, M. Koza, S. T. Bramwell, and J. S. Gardner, J. Phys.: Condens. Matter 15 , S635 (2004).
• “Anisotropic Elastic Properties of CeRhIn 5 .” R.S. Kumar, H. Kohlmann, B.E. Light, A.L. Cornelius , V. Raghavan, T.W. Darling, J.L. Sarrao, P.G. Pagliuso, N.O. Moreno, and J.D. Thompson, Phys. Rev. B 69 , 014515 (2004).
• “Heat Capacity Studies of Ce and Rh Site Substitution in the Heavy Fermion Antiferromagnet CeRhIn 5 : Short-Range Magnetic Interactions and non-Fermi-Liquid Behavior.” B.E. Light, A.L. Cornelius , P.G. Pagliuso and J.L. Sarrao, Phys. Rev. B 69 , 024419 (2004).
• “Uranium (and Cerium) Compounds At High Pressures and Magnetic Fields.” A.L. Cornelius . MRS Proceedings Volume 802 , DD 7.7 (2004)
• . “A New Energy Scale at Low Temperatures in YbAl 3 .” T. Ebihara, A.L. Cornelius , and J.M. Lawrence, Physica B 329 , 618 (2003).
• “Evolution of the Magnetic Ground State in the Electron-Doped Antiferromagnet CaMnO 3 .” A.L. Cornelius, B.E. Light and J.J. Neumeier, Phys. Rev. B . 68, 014403 (2003).
• . “Dependence of the Effective Masses in YbAl 3 on Magnetic Field and Disorder.” T. Ebihara, E.D. Bauer, A.L. Cornelius , J.M. Lawrence, N. Harrison, J.D. Thompson, J.L. Sarrao, M.F. Hundley, and S. Uji, Phys. Rev. Lett. 90 , 166404 (2003).
• “Dynamical Crossover in 'Hot' Spin Ice.” G Ehlers, A. L. Cornelius , M. Orendác, M. Kajnaková, T. Fennell, S. T. Bramwell, and J. S. Gardner, J. Phys.: Condens. Matter 15 , L9 (2003).
• “Slow Crossover and Observation of a Second Energy Scale in YbAl 3 Above 40 T.” A.L. Cornelius , T. Ebihara, and J.M. Lawrence, Acta Physica Pol. B 34 , 1299 (2003).
• “Ce-Site Dilution Studies in the Antiferromagnetic Heavy Fermions Ce m Rh n In 3m+2n (m = 1, 2;n = 0,1).” P. G. Pagliuso, N. O. Moreno, N. J. Curro, J. D. Thompson, M. F. Hundley, J. L. Sarrao, Z. Fisk, A. D. Christianson, A. H. Lacerda, B. E. Light, and A. L. Cornelius , Phys. Rev. B 66 , 054433 (2002) .
• "Observation of a Second Energy Scale in YbAl 3 Above 40 T." A.L. Cornelius , T. Ebihara, J.M. Lawrence, P.S. Riseborough, and J.D. Thompson, in Physical Phenomena in High Magnetic Fields IV , G. Boebinger, Z. Fisk, L. Gor'kov A. Lacerda and J.R. Schrieffer, eds., (World Scientific, 2002) 82.
• “Observation of a Second Energy Scale in YbAl 3 Above 40 T.” A.L. Cornelius , T. Ebihara, J.M. Lawrence, P.S. Riseborough, and J.D. Thompson, Int. J. Mod. Phys. B 16 , 2992 (2002).
• “Two Energy Scales and Slow Crossover in YbAl 3 .” A.L. Cornelius , J.M. Lawrence, T. Ebihara, P.S. Riseborough, C.H. Booth, M.F. Hundley, P.G. Pagliuso, J.L. Sarrao, J.D. Thompson, M.H. Jung, A.H. Lacerda, and G.H. Kwei, Phys. Rev. Lett. 88 , 117201 (2002).
• “Thermodynamic Investigation of the Magnetic Phase Transitions of CaMnO 3 And SrRuO 3 .” J.J. Neumeier, A.L. Cornelius , and K. Andres, Phys. Rev. B 64 , 172406 (2001) .
• “Field-induced Magnetic Transitions in the Quasi-Two-Dimensional Heavy Fermion Antiferromagnets Ce n RhIn 3n+2 .” A.L. Cornelius , P.G. Pagliuso, M.F. Hundley, and J.L. Sarrao Phys. Rev. B 64 , 144411 (2001) .
• “Short-Range Magnetic Interactions in the Spin-Ice Compound Ho 2 Ti 2 O 7 .” A.L. Cornelius and J.S. Gardner, Phys. Rev. B 64 , (Rapid Communication) 060406(R) (2001) .
• “Spin Correlations in Ho 2 Ti 2 O 7 : a Dipolar Spin Ice System.” S.T. Bramwell, M.J. Harris, B.C. den Hertog, M.J.P. Gingras, J.S. Gardner, D.F. McMorrow, A.R. Wildes, A.L. Cornelius , J.D.M. Champion, R.G Melko, and T. Fennell, Phys. Rev. Lett. 87 , 047205 (2001).
• “Local and Average Crystal Structure and Displacements of La 11 B 6 and EuB 6 as a Function of Temperature.” C.H. Booth, J.L. Sarrao, M.F. Hundley, A.L.Cornelius , G.H. Kwei, A. Bianchi, Z. Fisk, and J.M. Lawrence.” Phys. Rev. B 63 , 224302 (2001) .
• “Low Temperature Spin Dynamics of the Geometrically Frustrated Antiferromagnetic Garnet Gd 3 Ga 5 O 12 .” S.R. Dunsiger, J.S. Gardner, J.A. Chakhalian, A.L. Cornelius , M. Jaime, R.F. Kiefl, R. Movshovich, W.A. MacFarlane, R.I. Miller, J.E. Sonier, and B.D. Gaulin, Phys. Rev. Lett. 85 , 3504 (2000).
• “Anisotropic Electronic and Magnetic Properties of the Quasi-Two-Dimensional Heavy-Fermion Antiferromagnet CeRhIn 5 .” A.L. Cornelius , A.J. Arko, J.L. Sarrao, M.F. Hundley, and Z. Fisk, Phys. Rev. B 62 , 14181 (2000).
• “The Electronic Structure of ThBe 13 .” N. Harrison, A.L. Cornelius , H. Harima, K. Takegahara, J.A. Detwiler, G.M. Schmiedeshoff, J.C. Cooley, and J.L. Smith, Phys. Rev. B 61 , 1779 (2000).
• “Electron Spin Resonance of Gd 3+ and Nd 3+ in LuIn A 4 ( A = Cu, Ni). P.G. Pagliuso, C Rettori, J. Sarrao, A. Cornelius , M.F. Hundley, Z. Fisk, and S.B. Oseroff, Phys. Rev. B 59 , 13515 (1999).
• “de Haas-van Alphen Effect and Magnetic Transitions in the Heavy-Fermion System UCd 11 .” A.L. Cornelius , A.J. Arko, J.L. Sarrao, and N. Harrison, Phys. Rev. B 59 , 13542 (1999).
• “Electronic Properties of U X 3 ( X =Ga, Al and Sn) Compounds in High Magnetic Fields: Transport, Specific Heat, Magnetization and Quantum Oscillations.” A.L. Cornelius , A.J. Arko, J.L. Sarrao, J.D. Thompson, M.F. Hundley, C. H. Booth, N. Harrison, and P.M. Oppeneer, Phys. Rev. B 59 , 14473 (1999).
• “Physical Properties of Yb X Cu 4 ( X =Ag, Au, Cd, Mg, Tl, and Zn) Compounds.” J.L. Sarrao, C.D. Immer, Z. Fisk, C.H. Booth, E. Figueroa, J.M. Lawrence, R. Modler, A.L. Cornelius , M.F. Hundley, G.H. Kwei, J.D. Thompson, and F. Bridges, Phys. Rev. B 59 , 6855 (1999).
• “Lattice Effects in La 1- x Ca x MnO 3 ( x =0 to 1): Relationships Between Distortions, Charge Distribution, and Magnetism.” C.H. Booth, F. Bridges, G.H. Kwei, J.M. Lawrence, A.L. Cornelius and J.J. Neumeier, Phys. Rev. B 57 , 10440 (1998).
• “Volume-Based Considerations for the Metal-Insulator Transition of CMR Oxides.” J.J. Neumeier, A.L. Cornelius , M.F. Hundley, K Andres and K.J. McClellan, Mat. Res. Soc. Symp. Proc. 494 , 293 (1998).
• . “Ferromagnetism and Crystal Fields in YbInNi 4 .” J.L. Sarrao, R. Modler, R Movshovich, A.H. Lacerda, D. Hristova, A.L. Cornelius , M.F. Hundley, J.D. Thompson, C.L. Benton, C.D. Immer, M.E. Torelli, G.B. Martins, Z. Fisk and S.B. Oseroff, Phys. Rev. B 57 , 7785 (1998).
• “Direct Relationship between Magnetism and MnO 6 Distortions in La 1- x Ca x MnO 3 .” C.H. Booth, F. Bridges, G.H. Kwei, J.M. Lawrence, A.L. Cornelius and J.J. Neumeier, Phys. Rev. Lett. 80 , 853 (1998).
• “ESR of Gd 3+ in LuInCu 4 Intermetallic Compound.” P.G. Pagliuso, C Rettori, S.B. Oseroff, J. Sarrao, Z. Fisk, A. Cornelius and M.F. Hundley, Solid State Commun. 104 , 223 (1997).
• “ESR of Gd 3+ in the Kondo-Lattice Compound YbAgCu 4 and its Reference Compounds R AgCu 4 ( R =Y, Lu).” P.G. Pagliuso, C Rettori, S.B. Oseroff, J. Sarrao, Z. Fisk, A. Cornelius and M.F. Hundley, Phys. Rev. B 56 , 8933 (1997).
• “Experimental Studies of the Phase Transition in YbIn 1- x Ag x Cu 4 .” A.L. Cornelius , J.M. Lawrence, J.L. Sarrao, Z. Fisk, M.F. Hundley, G.H. Kwei, J.D. Thompson, C.H. Booth and F. Bridges, Phys. Rev. B 56 , 7993 (1997).
• “Strongly Correlated Electron Systems: Photoemission and the Single-Impurity Model.” .J. Arko, J.J. Joyce, A.B. Andrews, J.D. Thompson, J.L. Smith, D. Mandrus, M.F. Hundley, A.L. Cornelius , E. Moshopoulou, Z. Fisk, P.C. Canfield and A Menovsky, Phys. Rev. B 56 (Rapid Communication), R7041 (1997).
• “Hydrostatic High-Pressure Studies on the Ferromagnetic Kondo-Lattice Compounds CePdSb and CeAg to 16 GPa.” A.L. Cornelius , A.K. Gangopadhyay, J.S. Schilling, and W. Assmus, Phys. Rev. B 55 , 14109 (1997).
• “High-Pressure Susceptibility Studies on the Ferromagnetic Uranium Monochalcogenides US, USe and UTe.” A.L. Cornelius , J.S. Schilling, O. Vogt, K. Mattenberger and U. Benedict, J. Magn. Magn. Mater. 161 , 169 (1996).
• “Anomalous Hydrostatic-Pressure Dependence of the Curie-Temperature of the Kondo-Lattice Compound YbNiSn to 38 GPa.” A.L. Cornelius , J.S. Schilling, D. Mandrus, and J.D. Thompson, Phys. Rev. B 52 (Rapid Communication), R15699 (1995).
• “High-Pressure Study of the Anomalous Ferromagnet CeRh 3 B 2 to 7 GPa: Comparison with Substitutional Experiments.” A.L. Cornelius and J.S. Schilling, Phys. Rev. B 49 , 3955 (1994).
• “Influence of Pressure on the Ferromagnetic Transition Temperature of SrRuO 3 .” J.J. Neumeier, A.L. Cornelius and J.S. Schilling, Physica B 198 , 324 (1994).
• “High Pressure Studies on the Ferromagnetic Dense Kondo Systems CeRh 3 B 2 and UCu 2 Ge 2 .” A.L. Cornelius , J.S. Schilling, T. Endstra and J.A. Mydosh, AIP Conf. Proceedings 309 , 1457 (1994).
• “A Model Calculation of the Anisotropic Compressibility for Superconducting HgBa 2 Ca n-1 Cu n O 2n+2+ d .” A.L. Cornelius and J.S. Schilling, Physica C 218 , 369 (1993).
• “A Simple Model for Estimating the Anisotropic Compressibilities of High-Temperature Superconductors.” A.L. Cornelius , S. Klotz and J.S. Schilling, Physica C 197 , 209 (1992).
• “Transport-Critical-Current Behavior and Grain-Boundary Microstructure in YBa 2 Cu 3 O x .” Donglu Shi, J.G. Chen, M. Xu, A.L. Cornelius , U. Balachandran and K.C. Goretta, Supercon. Science Tech. 3 , 222 (1990).
• “Effect of Microstructural Changes on Thermally Activated Flux-Creep Behavior in the Bi-Sr-Ca-Cu-O System.” Donglu Shi, Ming Xu, M.M. Fang, J.G. Chen, A.L. Cornelius and S.G. Lanan, Phys. Rev. B 41 , 8833 (1990).
• “Highly Textured Thick Films by a Melt-Annealing Technique in the Bi-Sr-Ca-Cu-O System.” Ming Xu, A.L. Cornelius , Donglu Shi, J.G. Chen, B. Dabrowski and D. Miller, Appl. Phys. Lett. 55 , 2236 (1989).
• “Measurement and Correlation of Optical and TEM Twins in YBa 2 Cu 3 O 7- d .” L.S. Chumbley, J.D. Verhoeven, M.R. Kim, A.L. Cornelius and M.J. Kramer, IEEE Trans. Mag. 25 , 2337 (1989).

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