Metallic spin-liquid-like behavior of LiV2O4

Article

关键词: TEMPERATURE SPECIFIC-HEAT;    QUANTUM CRITICALITY;    GROUND-STATE;   

DOI  :  10.1103/PhysRevB.99.041113

来源: SCIE

【 摘 要 】

LiV2O4 spinel is known to exhibit heavy-fermion-like behavior below a characteristic temperature T-K similar or equal to 20 K, while it preserves a paramagnetic state down to T similar to 10(-2) K due to geometrical frustration. Here, it is shown that the dynamical spin susceptibility chi (q, omega) in LiV(2)O(4 )exhibits an anomalous duality which is modeled as a sum of itinerant (chi(F)) and local (chi(L)) components, and that the local spin dynamics inferred from chi(L) (q, omega) is qualitatively different from that expected from time-averaged bulk properties. The anomaly coexists with the marginal Fermi-liquid behavior inferred from the - ln T dependence of the electronic specific heat over a wide temperature range below T-K. We argue that such unusual properties of LiV2O4 can be attributed to the putative metallic spin-liquid state emerging near the quantum critical point between spin-glass and Fermi-liquid states.

【 授权许可】

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