Multiferroic quantum criticality in (Eu,Ba,Sr)TiO₃ solid solution

2024/01/09 by Repček, Dalibor, Proschek, Petr, Savinov, Maxim +6 · 1 citation
#FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2401.04677

Abstract

Based on the earlier published theory (Nature Mat. 18, 223--228 (2019)), a comprehensive experimental investigation of multiferroic quantum critical behavior of (Eu,Ba,Sr)TiO₃ polycrystalline and single crystal samples was performed. Presence of the displacive ferroelectric quantum criticality is revealed through non-classical (T²) temperature scaling of inverse dielectric susceptibility up to 60 K. With increasing hydrostatic pressure, this ferroelectric quantum criticality is gradually suppressed. Inverse magnetic susceptibility follows classical Curie-Weiss law down to 4 K, but quantum fluctuations belonging to an antiferromagnetic phase transition (T_N < 0.8 K) change its scaling below 3 K to T^{(1.7± 0.1)} and T^{(2.1± 0.2)} for samples containing 29 % and 25 % of Eu²⁺ ions, respectively. Experimental indications of the coexisting ferroelectric and antiferromagnetic, i.e. multiferroic, quantum fluctuations and qualitative explanation why they could be seen only in the immediate proximity of T_N is given.

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