NQR and T1 studies of the high-pressure phase in YbInCu4

Ben-Li Young*, N. J. Curro, V. A. Sidorov, J. D. Thompson, J. L. Sarrao

*Corresponding author for this work

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The pressure and temperature phase diagram of YbInCu4 has been investigated by nuclear quadrupolar resonance (NQR) and spin-lattice relaxation rate (T1-1) experiments. The pressure dependence of the Cu63 NQR frequency indicates that the first-order valence transition temperature, Tv, does not vanish continuously at the critical pressure (Pc≈23.7kbar) and thus there is no quantum critical point (Tv=0) in YbInCu4. This result is consistent with the T1-1 data, which show no evidence for non-Fermi-liquid behavior near Pc. For pressures P Pc, T1-1 increases sharply near 2.4K, which suggests the presence of critical fluctuations associated with ferromagnetic (FM) ordering. We analyze the T1-1, resistivity, and the pressure-enhanced susceptibility data in the mixed-valent state of YbInCu4 and find no evidence to indicate that the pressure-induced FM phase can be described by the Stoner theory for itinerant ferromagnetism. Rather, the pressure-induced FM order may be due to pressure-stabilized Yb3+ local moments. We also examine the possibility of FM order induced by an external magnetic field near Pc, but find no evidence down to 1.5K.

Original languageEnglish
Article number224106
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
StatePublished - 1 Jun 2005

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