Tricritical-point phase diagram in PrCu9Sn4
Tricritical-point phase diagram in PrCu9Sn4
复制标题
PrCu9Sn4 的三临界点相图
DOI：
10.1088/1361-648x/ac4f7c
复制
发表时间：
2022-01
期刊：
影响因子：
--
通讯作者：
Yuheng Zhang
中科院分区：
文献类型：
--
作者：
Fanying Meng;Min Ge;Wensen Wei;Azizur Rahman;Wei Liu;Aina Wang;Jun Zhao;Jiyu Fan;Chunlan Ma;Li Pi;Lei Zhang;Yuheng Zhang
多相三临界现象是凝聚态物理中的一个基本而有吸引力的问题。在这项工作中，场调制的三临界现象实现在单晶PrCu 9 Sn 4。不同磁场方向下的磁化强度表明PrCu 9 Sn 4具有很强的磁各向异性，表明H//c具有铁磁耦合.在T C = 11.7K时，H//c发生顺磁-铁磁相变，属一级磁相变.系统地研究了H//c的临界行为，得到β = 0.195（8），γ = 0.911（1），δ = 0.0592（1），符合三临界平均场模型，表明存在场调制的三临界现象。对单晶PrCu 9 Sn 4在H//c下的三临界点（TCP）附近的H-T相图进行了详细的绘制，其中铁磁态、强迫铁磁相和顺磁态在TCP处相遇（Htr = 799 kOe，Ttr = 11.3K）.单晶PrCu_9Sn_4为深入研究场调制磁耦合和三临界现象提供了一个平台。
Tricritical phenomenon appearing in multiple phases is a fundamental and attractive issue in condensed-matter physics. In this work, a field-modulated tricritical phenomenon is realized in single-crystal PrCu9Sn4. The magnetization under variable directions of field indicates strong magnetic anisotropy in PrCu9Sn4, which reveals ferromagnetic coupling for H//c. A paramagnetic-to-ferromagnetic magnetic transition occurs with H//c at T C = 11.7 K, which is evidenced to be of a first-ordered type. The systematical study of the critical behavior gives that β = 0.195(8), γ = 0.911(1), and δ = 0.0592(1) for H//c consistent with a tricritical mean-field model, which suggests a field-modulated tricritical phenomenon. A detailed H − T phase diagram around the tricritical point (TCP) is constructed for single-crystal PrCu9Sn4 for H//c, where ferromagnetic state, forced ferromagnetic phase and paramagnetic state meet at the TCP (H tr = 799 kOe, T tr = 11.3 K). The single-crystal PrCu9Sn4 supplies a platform to deep investigate the field-modulated magnetic couplings and tricritical phenomenon.