CEMG --- PERSONNEL

Peter Khalifah, Postdoctoral Associate
Oak Ridge National Laboratory
Condensed Matter Sciences Division
1 Bethel Valley Road, P. O. Box 2008
Bldg. 3150, MS 6056
Oak Ridge, TN 37831-6056
Phone: (865) 574-5496
Fax: (865) 574-4814
E-mail: kpete@ornl.gov

Research Interests:
Electronic and magnetic materials: discovery, synthesis and characterization

Education:
Post-doc Oak Ridge National Laboratory (2001-present)
Condensed Matter Sciences Division, Correlated Electron Materials Group
Advisor, Dr. David Mandrus

Ph. D. Princeton University (1996-2001)
Department of Chemistry and Princeton Materials Institute
Advisor, Dr. Robert J. Cava
Thesis: “Beyond perovskites: a magnetic, electronic, and theoretical exploration of less common ruthenate structure types”

B.S. Duke University (1992-1996)
Department of Chemistry
Graduated cum laude and with distinction (departmental honors)

Publications:
1. P. Khalifah, Q. Huang, J. W. Lynn, R. W. Erwin and R. Cava. “Magnetic Behavior of La₇Ru₃O₁₈”, Journal of Physics: Condensed Matter, 15, 5747-5753 (2003).

2. P. Khalifah, R. Osborn, Q. Huang, H. W. Zandbergen, R. Jin, Y. Liu, D. Mandrus, and R. J. Cava. “Orbital ordering transition in La₄Ru₂O₁₀”, Science, 297, 2237-40 (2002).

3. P. Khalifah, D. M. Ho, Q. Huang, and R. J. Cava. “The structure and properties of ?–La₃RuO₇: A new structure type with isolated RuO₆ octahedra”, Journal of Solid State Chemistry, 165, 359-362 (2002).

4. P. Khalifah and R. J. Cava. “Metal-metal bonding in the KSbO₃-type oxides La₄Ru₆O₁₉ and La₃Ru₃O₁₁: A mechanism for band gap formation in t2g states”, Physical Review B, 64, 085111 (2001).

5. T. Yildrim, O. Gulseren, J. W. Lynn, C. M. Brown, T. J. Udovic, Q. Huang, N. Rogado, K. A. Regan, M. A. Hayward, J. S. Slusky, M. K. Haas, P. Khalifah, K. Inumaru, and R. J. Cava. “Giant anharmonicity and nonlinear electron-phonon coupling in MgB₂: A combined first-principles calculation and neutron scattering study”, Physical Review Letters, 87, 037001 (2001).

6. P. Khalifah, K. D. Nelson, R. Jin, Z. Q. Mao, Y. Liu, Q. Huang, X. P. A. Gao, A. P. Ramirez, and R. J. Cava. “Non-Fermi-liquid behavior in La₄Ru₆O₁₉”, Nature, 411, 669-71 (2001).

7. J. S. Slusky, N. Rogado, K. A. Regan, M. A. Hayward, P. Khalifah, T. He, K. Inumaru, S. M. Loureiro, M. K. Haas, H. W. Zandbergen, and R. J. Cava. “Loss of superconductivity with the addition of Al to MgB2 and a structural transition in Mg1-xAlxB2”, Nature, 410, 343-5 (2001).

8. D. C. Larbalestier, L. D. Cooley, M. O. Rikel, A. A. Polyanksi, J. Jiang, S. Patnaik, X. Y. Cai, D. M. Feldmann, A. Gurevich, A. A. Squiteri, M. T. Naus, C. B. Eom, E. E. Hellstrom, R. J. Cava, K. A. Regan, N. Rogado, M. A. Hayward, T. He, J. S. Slusky, P. Khalifah, K. Inumaru, and M. Haas. “Strongly linked current flow in polycrystalline forms of the superconductor MgB2”, Nature, 410, 186-9 (2001).

9. P. Khalifah, Q. Huang, D. M. Ho, H. W. Zandbergen, and R. J. Cava. “La7Ru3O18 and La4.87Ru2O12: Geometric frustration in two closely related structures with isolated RuO6 octahedra”, Journal of Solid State Chemistry, 155, 189-97 (2000).

10. D. P. Young, C. L. Brown, P. Khalifah, R. J. Cava, and A. P. Ramirez. “Thermoelectric properties of Ag3AuTe2”, Journal of Applied Physics, 88, 5221-4 (2000).

11. I. S. Hagemann, P. Khalifah, A. Ramirez, and R. J. Cava. “Geometric magnetic frustration in olivines”, Physical Review B, 62, R771-4 (2000).

12. P. Khalifah, Q. Huang, J. W. Lynn, R. W. Erwin and R. Cava. “Synthesis and Crystal Structure of La3RuO7”, Materials Research Bulletin, 35, 1-7 (2000).

13. D. P. Young, P. Khalifah, A. P. Ramirez and R. J. Cava. “Thermoelectric properties of pure and doped FeMSb (M=V,Nb)”, Journal of Applied Physics, 87, 317-321 (2000).

14. P. Khalifah, R. W. Erwin, J. W. Lynn, Q. Huang, B. Batlogg and R. J. Cava, “Magnetic and electronic characterization of quasi-one-dimensional La3RuO7”, Physical Review B, 60, 9573–9578 (1999).

15. D. P. Young, P. Khalifah, A. P. Ramirez and R. J. Cava. “Ln3Au3Sb4: Thermoelectrics with low thermal conductivity”, Applied Physics Letters, 74, 3999-4001 (1999).

16. K. Mastronardi, D. Young, C.-C. Wang, P. Khalifah, R. J. Cava and A. P. Ramirez. “Antimonides with the half-Heusler structure: New thermoelectric materials”, Applied Physics Letters, 74, 1415 (1999).

17. R. Grandori, P. Khalifah, J. A. Boice, R. Fairman, K. Giovanielli and J. Carey. “Biochemical characterization of WrbA, founding member of a new family of multimeric flavodoxin-like proteins”, Journal of Biological Chemistry, 273, 20960-20966 (1998).

APL, 2; JAP, 2; JBC, 1; JP:CM, 1; JSSC, 2; MRB, 1; Nature, 3; PRB, 3; PRL, 1; Science, 1

Pending Publication:
1. P. Khalifah, I. Ohkubo, H. Christen and D. Mandrus, “Non-Fermi liquid behavior near the ferromagnetic quantum critical point in the series CaxSr1-xRuO3”, submitted to Physical Review Letters, cond-mat/0308514 (2003).

2. R. Jin, B. Sales, P. Khalifah and D. Mandrus, “Observation of Bulk Superconductivity in NaxCoO2•yH2O and NaxCoO2•yD2O Powder and Single Crystals”, submitted to Physical Review Letters, cond-mat/0306066 (2003)

3. P. Khalifah, Q. Huang, H. W. Zandbergen, D. M. Ho, R. J. Cava, “La4Ru2O10: a layered ruthenate with double 110 perovskite planes”, in preparation.

Invited Talks:
2002 Brookhaven National Laboratory, Physics Department
2001 American Physical Society, March Meeting
IBM Research Labs, Yorktown Heights
Oak Ridge National Laboratory, Solid State Division
Argonne National Laboratory, Materials Science Division