Crystal-electric-field effects and quadrupole fluctuations in Ce3Au3Sb4 detected by Sb NQR

Article

关键词: SEMICONDUCTING PROPERTIES;    TRANSPORT-PROPERTIES;    HEAVY-FERMION;    GAP;    RELAXATION;    CE3BI4PT3;    METALS;    YBSB;    NMR;    CU;   

DOI  :  10.1103/PhysRevB.82.035203

来源: SCIE

【 摘 要 】

We report Sb-121,Sb-123 nuclear quadrupole resonance (NQR) studies on single crystals of the narrow-gap semiconductor Ce3Au3Sb4. Five NQR lines from the two Sb isotopes were successfully identified. The temperature dependence of the nuclear quadrupole frequency (nu(Q)), as well as the static magnetic susceptibility (chi), is well explained by crystal-electric-field effects. The nuclear spin-lattice relaxation rates (T1(-1)) of both Sb-121 and Sb-123 increase rapidly with decreasing temperature. The ratio of T-1(-1) for the two Sb isotopes is constant at high temperature but it decreases at low temperatures, indicating the role of quadrupole fluctuations of the Ce ions. The possible origin of the large specific heat at low temperatures is discussed basing on our results.

【 授权许可】

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