Observation of enhanced ferromagnetic spin-spin correlations at a triple point in quasi-two-dimensional magnets

被引：4

作者：

Zhang, Yugang ^{[1
,2
]}

Li, Zefang ^{[3
]}

Zhang, Jing ^{[1
,2
]}

Cao, Ning ^{[2
]}

Zhang, Long ^{[1
,2
]}

Li, Yonghong ^{[1
,2
]}

Liu, Shuang ^{[2
]}

Zhou, Xiaoyuan ^{[2
]}

Sun, Young ^{[2
]}

Wang, Wenhong ^{[3
,4
]}

Chai, Yisheng ^{[1
,2
]}

机构：

[1] Chongqing Univ, Coll Phys, Low Temp Phys Lab, Chongqing 401331, Peoples R China

[2] Chongqing Univ, Ctr Quantum Mat & Devices, Chongqing 401331, Peoples R China

[3] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[4] Tiangong Univ, Sch Elect & Informat Engn, Tianjin 300387, Peoples R China

来源：

PHYSICAL REVIEW B | 2023年 / 107卷 / 13期

关键词：

ANOMALOUS THERMAL-EXPANSION; FORCED MAGNETOSTRICTION;

D O I：

10.1103/PhysRevB.107.134417

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic field-temperature phase diagrams and spin-spin correlations of quasi-two-dimensional fer-romagnetic Cr2Ge2Te6 and Cr2Si2Te6 and antiferromagnetic MnBi2Te4 are investigated and compared by a sensitive composite magnetoelectric method. The phase diagrams of Cr2Ge2Te6 and Cr2Si2Te6 disclose a triple point around the Curie temperature where three phases coexist, for both H II c axis and ab plane configurations. In contrast, a triple/tricritical point is found in MnBi2Te4 only for the H II c axis configuration. Anomalous enhancement of magnetoelectric signals is observed near the triple points of Cr2Ge2Te6 and Cr2Si2Te6, suggest-ing significant enhancement of ferromagnetic spin-spin correlations at this point. Nevertheless, no short-range spin-spin correlation is found in MnBi2Te4 above the Neel temperature.

引用

页数：8

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