Effect of very high pressure on the magnetic state of transition metal compounds

High Pressure Research

Volumn 24, Issue 1, 2004, Pages 33-43

  Pasternak, Moshe P ^a   Rozenberg, Gregory K H ^a   Xu, Weiming M ^a   Taylor, R Dean ^b  

^a TEL AVIV UNIVERSITY   (Israel)

^b LOS ALAMOS NATIONAL LABORATORY   (United States)

Author keywords

Correlated system; High pressure; Hyperfine interaction; Magnetism; Phase transition; Transition metal compound

Indexed keywords

ANTIFERROMAGNETIC MATERIALS; COMPOSITION; ELECTRIC CONDUCTIVITY; GASKETS; HIGH PRESSURE EFFECTS; INSULATING MATERIALS; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; MOSSBAUER SPECTROSCOPY; PEROVSKITE; PHASE TRANSITIONS; QUANTUM THEORY; SENSITIVITY ANALYSIS; SYNCHROTRON RADIATION; SYNTHESIS (CHEMICAL); X RAY DIFFRACTION;

CORRELATED-SYSTEMS; HYPERFINE-INTERACTION; MOTT TRANSITIONS; ORBIT-QUENCHING;

TRANSITION METAL COMPOUNDS;

EID: 4644362520     PISSN: 08957959     EISSN: None     Source Type: Journal    
DOI: 10.1080/08957950310001635783     Document Type: Conference Paper

References (19)

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2. 3 (see J. B. Torrance, et al., Phys. Rev., B45, 8209 (1992)).
3. ij denoting the hopping of an electron from site i to its nearest neighbor site j and by the extra energy cost U of putting two electrons (n↑n↓) on the same site. The bandwidth W is proportional to t. In the case of charge transfer insulator, U, the energy gap separating the empty and filled d-bands, is replaced by Δ, a gap between the empty d-band and filled-ligand bands (J. G. Zaanen, G. A. Sawatzky and J. W. Allen, Phys. Rev. Lett., 55, 418 (1985)).
4. ij denoting the hopping of an electron from site i to its nearest neighbor site j and by the extra energy cost U of putting two electrons (n↑n↓) on the same site. The bandwidth W is proportional to t. In the case of charge transfer insulator, U, the energy gap separating the empty and filled d-bands, is replaced by Δ, a gap between the empty d-band and filled-ligand bands (J. G. Zaanen, G. A. Sawatzky and J. W. Allen, Phys. Rev. Lett., 55, 418 (1985)).
5. It is of note that the CF splitting increases proportional to the inverse of the fifth power of the TM-ligand-bond length (D. M. Sherman, In: S. K. Saxena, (Ed.), Advances in Physical Geochemistry, Vol. 7 (Springer-Verlag, Berlin, 1988), p. 113).
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7. Purchased from D'Anvils Ltd. (www.danvils.com).
8. 2 vapor in the same evacuated tube.
9. Due to the proximity of electrodes (∼ 10 μm), there was no need for a pressure medium.
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12. 1g ground state.
13. Note that following the first compression cycle (filled circle curve), R(P) upon decompression reaches a value that is lower at ∼ 5 GPa, Successive compression and decompression cycles are reproducible. This phenomenon can be explained as due to compacting of the sample during the first compression cycle.
14. hf = 0.
15. =Q.
16. M. P. Pasternak et al. Phys. Rev. Lett., 82, 4663 (1999).
17. G. Kh. Rozenberg, M. P. Pasternak, R. D. Taylor (to be published).
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19. M. P. Pasternak, W. M. Xu, G. Kh. Rozenberg, R. D. Taylor, G. R. Hearne and E. Sterer, Phys. Rev. B, 65, 035106 (2001).