Abstract
spinel is known to exhibit heavy-fermion-like behavior below a characteristic temperature K, while it preserves a paramagnetic state down to K due to geometrical frustration. Here, it is shown that the dynamical spin susceptibility in exhibits an anomalous duality which is modeled as a sum of itinerant () and local () components, and that the local spin dynamics inferred from is qualitatively different from that expected from time-averaged bulk properties. The anomaly coexists with the marginal Fermi-liquid behavior inferred from the dependence of the electronic specific heat over a wide temperature range below . We argue that such unusual properties of can be attributed to the putative metallic spin-liquid state emerging near the quantum critical point between spin-glass and Fermi-liquid states.
- Received 20 April 2018
- Revised 13 July 2018
DOI:https://doi.org/10.1103/PhysRevB.99.041113
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