Graduate School of Science and Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan.
Center for Liberal Arts and Sciences, Faculty of Engineering Toyama Prefectural University, 5180 Kurokawa, Toyama 939-0398, Japan.
J Phys Condens Matter. 2023 Mar 31;35(24). doi: 10.1088/1361-648X/acc562.
Low-temperature and elastic properties of the quasicrystal approximant GdCdhave been investigated by means of an ultrasonic measurement. Salient elastic anomalies were observed in the temperature and magnetic field dependence of the principal elastic constants, most probably being associated with the successive multiple magnetic phase transitions showing up at low temperatures. Based on the experimental data, a magnetic field vs temperature phase diagram was constructed. In a zero magnetic field, at least four phases appear to exist. However, the phase diagram both for the magnetic field applied for//⟨100⟩and//⟨110⟩is richer, and interestingly some phase boundaries correspond to the development of field-induced phases, leading to the intricate magnetic phase diagram possibly with multiple ordered phases. We discuss the elastic and electronic properties at low temperatures, and also the nature of the multiple magnetic phase transitions of GdCd.
低温和弹性性质的准晶近似 GdCd 已经通过超声测量的方法进行了研究。在主弹性常数的温度和磁场依赖关系中观察到显著的弹性反常，这很可能与低温下出现的连续多次磁相变有关。基于实验数据，构建了一个磁场与温度的相图。在零磁场中，至少存在四个相。然而，磁场施加于//⟨100⟩和//⟨110⟩的相图更加丰富，有趣的是，一些相界对应于场诱导相的发展，导致复杂的磁相图可能具有多个有序相。我们讨论了低温下的弹性和电子性质，以及 GdCd 的多次磁相变的本质。
