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Origins of temperature-dependent magnetism in open-shell 4$d$ and 5$d$ halide perovskites
Ying Li, Ram Seshadri, Stephen D. Wilson, Anthony K. Cheetham, Roser Valenti
https://arxiv.org/abs/2402.14064

Origins of temperature-dependent magnetism in open-shell 4$d$ and 5$d$ halide perovskites
A few $4d$ and $5d$ transition metal compounds with various electron fillings were recently found to exhibit magnetic susceptibilities $χ$ and magnetic moments that deviate from the well-established Kotani model. This model has been considered for decades to be the canonical expression to describe the temperature dependence of magnetism in systems with non-negligible spin-orbit coupling effects. In this work, we uncover the origin of such discrepancies and determine the applicability and limit…