Crystallography and magnetism of the heavy-fermion compound YbBiPt
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) National Laboratory for High-Energy Physics, Tsukuba 305 (Japan)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) New Mexico State University, Las Cruces, New Mexico 88003 (United States)
- Department of Physics, Tohoku University, Sendai 980 (Japan)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States)
- Institute of Materials Science, University of Tsukuba, Tsukuba 305 (Japan)
- Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
The super-heavy-fermion compound YbBiPt has the largest known linear specific-heat coefficient [gamma]=8 J mol[sup [minus]1] K[sup [minus]2], and the source of this enormous electronic'' specific heat is of great current interest. Here we describe neutron-diffraction studies that indicate its previously reported crystallographic structure to be incorrect. We find that the Pt atom is on the unique site and can be thought of as an interstitial in a fictitious rock-salt structure YbBi, which can in turn be thought of as an ordered form of elemental bismuth. We find no evidence of disorder between sites, occupancy on the nominally vacant site, nor for any tetragonal or rhombohedral distortions or displacements. Furthermore, any ordered magnetic moment at low temperature must be less than 0.25[mu][sub [ital B]]. The sample contains 8.1 wt. % elemental Bi, and if this is typical of other samples, the previously published values for molar susceptibilities and specific heats should be scaled up by this amount to obtain the intrinsic properties of YbBiPt alone.
- OSTI ID:
- 7229541
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 50:13; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BISMUTH COMPOUNDS
CRYSTAL STRUCTURE
PLATINUM COMPOUNDS
YTTERBIUM COMPOUNDS
INTERMETALLIC COMPOUNDS
MAGNETIC MOMENTS
NEUTRON DIFFRACTION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
X-RAY DIFFRACTION
ALLOYS
COHERENT SCATTERING
DIFFRACTION
RARE EARTH COMPOUNDS
SCATTERING
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
360102* - Metals & Alloys- Structure & Phase Studies
360104 - Metals & Alloys- Physical Properties