Ground state and low-energy magnetic dynamics in the frustrated magnet CoAl2O4 as revealed by local spin probes

Article

关键词: LATTICE ANTIFERROMAGNET;    CRYSTALS;    LIQUID;    ORDER;   

DOI  :  10.1103/PhysRevB.91.144419

来源: SCIE

【 摘 要 】

We report a combined experimental study of magnetic properties of a single crystal of the frustrated diamond lattice antiferromagnet CoAl2O4 with Co2+ electron spin resonance, Al-27 nuclear magnetic resonance, and muon spin rotation/relaxation techniques. With our local probes, we show that the frustration of spin interactions and the Co/Al site disorder strongly affect the spin dynamics. The experimental results evidence inhomogeneous and slow magnetic fluctuations and the occurrence of short-range electron spin correlations far above a characteristic temperature T* = 8 K at which the spin system turns into in a quasistatic state. Our data indicate that this spin order is likely short range and unconventional with spin fluctuations persistent even at T << T*. The results of three spectroscopy techniques highlight a nontrivial role of structural disorder for the magnetism of a frustrated diamond spin lattice at the proximity to the critical point.

【 授权许可】

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