Abstract
We report resistivity measurements on the cubic heavy-fermion compound YbBiPt at ambient and hydrostatic pressures to [approx]6 kbar and in magnetic fields to 1 T. Resistivity anisotropy sets in below the phase-transition temperature [ital T][sub [ital c]]=0.4 K. We interpret a rise of resistivity below 0.4 K as due to partial gapping of the Fermi surface with the weak coupling energy gap of [Delta][sub 0]/[ital k][sub [ital B]][ital T][sub [ital c]]=1.65[plus minus]0.15. Effects of hydrostatic pressure and magnetic field on the phase transition and heat capacity data are consistent with a spin density wave formation in a very heavy electron band at [ital T]=0.4 K.
Highlights
%e report resistivity measurements on the cubic heavy-fermion compound YbBiPt at ambient and hydrostatic pressures to =6 kbar and in magnetic fields to 1 T
Resistivity anisotropy sets in below the phase-transition temperature T, = 0.4 K. %e interpret a rise of resistivity below 0.4 K as due to partial gapping of the Fermi surface with the weak coupling energy gap of 60/k&T, . = 1.65 + 0
Effects of hydrostatic pressure and magnetic field on the phase transition and heat capacity data are consistent with a spin density wave formation in a very heavy electron band at T = 0.4 K
Summary
Fer-Iaai Surface Instability and Symmetry Breaking in Heavy-Fermion Compound YbBiPt. Los Alarnos Nationa/ Laboratory, Los A/amos, New Mexico 87545 (Received 1 February 1994). Effects of hydrostatic pressure and magnetic field on the phase transition and heat capacity data are consistent with a spin density wave formation in a very heavy electron band at T = 0.4 K. Inelastic neutron scattering [2] suggests that some fraction of this large 7 may be due to the existence of low-lying crystal-field excitations Separation of these and intrinsic heavy-fermion contributions has not been possible. To address questions of the nature of the magnetic transition in YbBiPt and its ground state, we have studied the electrical resistivity as a function of pressure and applied magnetic fields and we argue that these results, combined with specific heat measurements, are consistent with the development of a spin density wave (SDW) below 0.4 K in a heavy-mass band of conduction electrons.
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