To elucidate the ground state of the pressure-stabilized high-temperature (HT) phase of YbInCu4, we have carried out electrical resistivity ρ and ac-susceptibility χac measurements at high pressures. For pressures above 2.49 GPa, the first-order valence transition is completely suppressed (below 80 mK). Separately, above 2.39 GPa, a clear peak appears in χac with a small kink in ρ at around TM = 2.4 K. The χac peak is easily diminished by applying low magnetic fields and disappears above 500 Oe. The characteristic behavior of χac at TM can generally be ascribed to the onset of long-range ferromagnetic ordering and, therefore, the ground state of the pressure-stabilized HT phase is most probably a ferromagnetically ordered state. This result is compatible with the occurrence of weak ferromagnetism recently reported for the Y-substituted compound Yb0.8Y0.2InCu4 under pressure of 1.2 GPa.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Jun 11 2003|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics