Fig. 2: Comparison of thermal expansion and magnetization.
From: Thermodynamic evidence for polaron stabilization inside the antiferromagnetic order of Eu5In2Sb6
a Relative length change ΔL(T)/L0 measured along the three main crystallographic directions of Eu5In2Sb6. Inset: Low-temperature thermal expansion coefficient α(T, H) along the b axis and for representative magnetic fields μ0H = 0, 1.5, 2.0, 2.5 T. The feature near 8 K evolves non-monotonically with H. b Zero-field cooled (ZFC) magnetization of Eu5In2Sb6 measured in μ0H = 0.1 T for the three directions. For comparison, the field-cooled (FC) curve along the a axis is also shown. Arrows mark TN1 and TN2, respectively. Sketch: spin configuration just below TN1 in phase I, as suggested in ref. 15.
