Slow Spin Relaxation and Low-Temperature Spin Freezing in Disordered Fluorite Ho₂Zr₂O₇

2024/07/18 by A. Elghandour, Elghandour, A., Sheeta +4 · 2 citations
Environmental Science · #Methane Hydrates and Related Phenomena

paper · doi:10.48550/arxiv.2407.13580

Abstract

We report on the origin of spin freezing in the disordered fluorite Ho₂Zr₂O₇. The system is investigated by low-temperature heat capacity as well as by DC and AC magnetization. While the system does not show a long-range magnetic order down to at least T = 280~mK, we observe signatures of slow spin dynamics, magnetic field induced relaxation processes at relatively high temperatures, and a spin-frozen state below T = 0.6~K. Our results suggest that similar to the canonical spin ice systems Ho₂Ti₂O₇ [Ehlers 2004] and Dy₂Ti₂O₇ [Snyder 2001], spin freezing in Ho₂Zr₂O₇ is preceded by two slow spin relaxation processes; the first forms a field-induced region extending to at least 18~K and the second is rather field-independent and appears at T_{\mathrm g2} = 1~K [Ramon 2020].

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• Excitation spectrum and low-temperature magnetism in disordered defect-fluorite Ho2Zr2O7
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