Low temperature phase diagram of YbBiPt
- Los Alamos National Lab., NM (United States)
We report resistivity measurements on the cubic heavy-fermion compound YbBiPt at ambient and hydrostatic pressures to {approx} 19kbars and in magnetic fields to 1 Tesla. The phase transition at T{sub c}, = 0.4K is identified by a sharp rise in resistivity. We use that feature to build low temperature H-T and P-T phase diagrams. The phase boundary in the H-T plane follows the weak coupling BCS expression remarkably well from T{sub c}, to T{sub c}/4, while small hydrostatic pressure of {approx} lkbar suppresses the low temperature phase entirely. These effects of hydrostatic pressure and magnetic field on the phase transition are consistent with an SDW (Spin Density Wave) formation in a very heavy electron band at T = 0.4K. Outside of the SDW phase at low temperature, hydrostatic pressure increases the 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.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10138244
- Report Number(s):
- LA-UR-94-975; CONF-940874-1; ON: DE94009345
- Resource Relation:
- Conference: 6. magnetism and magnetic materials-INTERMAG conference,Albuquerque, NM (United States),10 Aug 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fermi surface instability at 0.4K in a heavy-fermion YbBiPt: SDW?
Fermi surface instability at 0.4K in a heavy-fermion YbBiPt: SDW?