Anomalous spin dynamics and excitations of the quasizigzag chain compound AgCrP2S6
Dr. Raman Sankar and his group, in collaboration with Prof. Kwang-Yong Choi at Sungkyunkwan University (Republic of Korea) investigated the spin dynamics and low-energy magnetic excitations of an S = 3/2 spin zigzag chain system in the van der Waals material AgCrP2S6 using electron spin resonance (ESR) and Raman spectroscopy. The temperature-dependent resonance intensity and g factor reveal the development of critical correlations as the temperature approaches the ordering temperature. Additionally, the temperature-dependent linewidth of the magnetic resonance exhibits power-law behavior, characteristic of low-dimensional spin systems. The twofold angular dependence of the ESR linewidth and the significant magnetic Raman scattering in interchain (bb) polarization suggests coupling between the zigzag Cr3+ chains. Furthermore, anomalies in the ESR parameters and the Fano mode observed in Raman data around T* ≈ 120K, together with an order-parameter-like shift of the magnetic spectral weight toward T*, indicate a change in the nature of the underlying magnetic excitations, induced by non-negligible next-nearest neighbor interactions and interchain couplings, which become effective below T*.
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期刊連結: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.111.134415