de Haas[endash]van Alphen and Shubnikov[endash]de Haas oscillations in RAgSb[sub 2] (R=Y, La-Nd, Sm)
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
- National High Field Laboratory, Los Alamos Facility, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
de Haas[endash]van Alphen and Shubnikov[endash]de Haas oscillations have been used to study the Fermi surface of the simple tetragonal RAgSb[sub 2] series of compounds with R=Y, La-Nd, and Sm. The high quality of the flux-grown single crystals, coupled with very small extremal cross sections of Fermi surface, allow the observation of quantum oscillations at modest fields (H[lt]30 hthinsp;kG) and high temperatures (up to 25 K in SmAgSb[sub 2]). For H[parallel]c, the effective masses, determined from the temperature dependence of the amplitudes, are quite small, typically between 0.07 and 0.5m[sub 0]. The topology of the Fermi surface was determined from the angular dependence of the frequencies for R=Y, La, and Sm. In SmAgSb[sub 2], antiferromagnetic ordering below 8.8 K is shown to dramatically alter the Fermi surface. For LaAgSb[sub 2] and CeAgSb[sub 2], the effect of applied hydrostatic pressure on the frequencies was also studied. Finally, the experimental data were compared to the Fermi surface calculated within the tight-binding linear muffin-tin orbital approximation. Overall, the calculated electronic structure was found to be consistent with the experimental data. [copyright] [ital 1999] [ital The American Physical Society]
- OSTI ID:
- 6115907
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 60:19; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANTIMONIDES
DE HAAS-VAN ALPHEN EFFECT
EFFECTIVE MASS
ELECTRONIC STRUCTURE
FERMI LEVEL
LANTHANUM CARBIDES
LANTHANUM COMPOUNDS
MUFFIN-TIN POTENTIAL
NEODYMIUM COMPOUNDS
PRASEODYMIUM COMPOUNDS
SAMARIUM COMPOUNDS
SHUBNIKOV-DE HAAS EFFECT
SILVER COMPOUNDS
TEMPERATURE DEPENDENCE
YTTRIUM COMPOUNDS
ANTIMONY COMPOUNDS
CARBIDES
CARBON COMPOUNDS
ENERGY LEVELS
MASS
PNICTIDES
POTENTIALS
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360104* - Metals & Alloys- Physical Properties