Low-temperature phase diagram of YbBiPt
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Resistivity measurements are reported on the cubic heavy-fermion compound YbBiPt at ambient and hydrostatic pressures to [approx]19 kbar and in magnetic fields to 1 T. The phase transition at [ital T][sub [ital c]]=0.4 K is identified by a sharp rise in resistivity. That feature is used to build low-temperature [ital H]-[ital T] and [ital P]-[ital T] phase diagrams. The phase boundary in the [ital H]-[ital T] plane follows the weak-coupling BCS expression remarkably well from [ital T][sub [ital c]] to [ital T][sub [ital c]]/4, while small hydrostatic pressure of [approx]1 kbar suppresses the low-temperature phase entirely. These effects of hydrostatic pressure and magnetic field on the phase transition are consistent with an spin-density-wave (SDW) formation in a very heavy electron band at [ital T]=0.4 K. Outside of the SDW phase at low temperature, hydrostatic pressure increases the [ital T][sup 2] coefficient of resistivity, signaling an increase in heavy-fermion correlations with hydrostatic pressure. The residual resistivity decreases with pressure, contrary to trends in other Yb heavy-fermion compounds.
- OSTI ID:
- 6909960
- Journal Information:
- Journal of Applied Physics; (United States), Vol. 76:10; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BISMUTH COMPOUNDS
PHASE DIAGRAMS
PLATINUM COMPOUNDS
YTTERBIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
HIGH PRESSURE
MAGNETIC FIELDS
MEDIUM PRESSURE
PRESSURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
VERY HIGH PRESSURE
DIAGRAMS
ELECTRICAL PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
360102* - Metals & Alloys- Structure & Phase Studies