Quantum and thermal spin relaxation in the diluted spin ice Dy2-xMxTi2O7 (M=Lu,Y)

Article

关键词: MAGNETIC-PROPERTIES;    PYROCHLORE;    SUSCEPTIBILITY;    FRUSTRATION;    TEMPERATURE;    CROSSOVER;    DY2TI2O7;    BEHAVIOR;    STATE;   

DOI  :  10.1103/PhysRevB.70.184431

来源: SCIE

【 摘 要 】

We have studied the low-temperature ac magnetic susceptibility of the diluted spin ice compound Dy2-xMxTi2O7, where the magnetic Dy ions on the frustrated pyrochlore lattice have been replaced with nonmagnetic ions, M=Y or Lu. We examine a broad range of dilutions, 0less than or equal toxless than or equal to1.98, and we find that the Tsimilar to16 K freezing is suppressed for low levels of dilution but re-emerges for x>0.4 and persists to x=1.98. This behavior can be understood as a nonmonotonic dependence of the quantum spin relaxation time with dilution. The results suggest that the observed spin freezing is fundamentally a single spin process that is affected by the local environment, rather than the development of spin-spin correlations as earlier data suggested.

【 授权许可】

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