Influence of short-range spin correlations on the mu SR polarization functions in the slow dynamic limit: Application to the quantum spin-liquid system Yb2Ti2O7

Article

关键词: ZERO-FIELD;    STOCHASTIC-THEORY;    RELAXATION;    FLUCTUATIONS;    TRANSITION;    ROTATION;   

DOI  :  10.1103/PhysRevB.87.134405

来源: SCIE

【 摘 要 】

Here we discuss how to account for short-range spin correlations on the measured muon spin relaxation spectra. The shape of the zero-field relaxation function is found to be highly sensitive to short-range spin correlations, as clearly inferred from the analysis of the published longitudinal relaxation function for the pyrochlore quantum spin-liquid system Yb2Ti2O7 at low temperature. The field distribution at the muon site in this compound is found to be strongly asymmetric, i.e., to deviate substantially from the usually expected Gaussian function. This is a clear signature of short-range correlations of the spins. Our analysis yields the characteristic function of the component field distribution at the muon site of Yb2Ti2O7, a well-defined statistical physics quantity accessible to theory once an interaction Hamiltonian is available and the muon site is determined. As a by-product of our study, we have found that the validity of the so-called golden formula due to Kubo is limited. DOI: 10.1103/PhysRevB.87.134405

【 授权许可】

Free