Crystal growth and magnetic properties of quantum spin liquid candidate KErTe2

doi:10.1088/1674-1056/ac1574

中国物理B ›› 2021, Vol. 30 ›› Issue (10): 107504-107504.doi: 10.1088/1674-1056/ac1574

Crystal growth and magnetic properties of quantum spin liquid candidate KErTe₂

Weiwei Liu(刘维维)^1,†, Dayu Yan(闫大禹)^2,†, Zheng Zhang(张政)¹, Jianting Ji(籍建葶)², Youguo Shi(石友国)^2,‡, Feng Jin(金峰)^2,§, and Qingming Zhang(张清明)^2,3

1 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China

收稿日期:2021-04-21 修回日期:2021-06-04 接受日期:2021-07-18 出版日期:2021-09-17 发布日期:2021-09-30
通讯作者: Youguo Shi, Feng Jin E-mail:ygshi@aphy.iphy.ac.cn;jinfeng@iphy.ac.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0302904 and 2016YFA0300504), the National Natural Science Foundation of China (Grant Nos. U1932215 and 11774419), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33010100), and Postdoctoral Science Foundation of China (Grant No. 2020M670500), Q.M.Z. acknowledges the support from Users with Excellence Program of Hefei Science Center and High Magnetic Field Facility, CAS.

Crystal growth and magnetic properties of quantum spin liquid candidate KErTe₂

Weiwei Liu(刘维维)^1,†, Dayu Yan(闫大禹)^2,†, Zheng Zhang(张政)¹, Jianting Ji(籍建葶)², Youguo Shi(石友国)^2,‡, Feng Jin(金峰)^2,§, and Qingming Zhang(张清明)^2,3

1 Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China

Received:2021-04-21 Revised:2021-06-04 Accepted:2021-07-18 Online:2021-09-17 Published:2021-09-30
Contact: Youguo Shi, Feng Jin E-mail:ygshi@aphy.iphy.ac.cn;jinfeng@iphy.ac.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2017YFA0302904 and 2016YFA0300504), the National Natural Science Foundation of China (Grant Nos. U1932215 and 11774419), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB33010100), and Postdoctoral Science Foundation of China (Grant No. 2020M670500), Q.M.Z. acknowledges the support from Users with Excellence Program of Hefei Science Center and High Magnetic Field Facility, CAS.

摘要/Abstract

摘要： Recently rare-earth chalcogenides have been revealed as a family of quantum spin liquid (QSL) candidates hosting a large number of members. In this paper we report the crystal growth and magnetic measurements of KErTe₂, which is the first member of telluride in the family. Compared to its cousins of oxides, sulfides and selenides, KErTe₂ retains the high symmetry of R3m and Er³⁺ ions still sit on a perfect triangular lattice. The separation between adjacent magnetic layers is expectedly increased, which further enhances the two dimensionality of the spin system. Specific heat and magnetic susceptibility measurements on KErTe₂ single crystals reveal no structural and magnetic transition down to 1.8 K. Most interestingly, the absorption spectrum shows that the charge gap of KErTe₂ is roughly 0.93±0.35 eV, which is the smallest among all the reported members in the family. This immediately invokes the interest towards metallization even superconductivity using the compound.

关键词: quantum spin liquids, exchange and superexchange interactions, magnetic anisotropy

Abstract: Recently rare-earth chalcogenides have been revealed as a family of quantum spin liquid (QSL) candidates hosting a large number of members. In this paper we report the crystal growth and magnetic measurements of KErTe₂, which is the first member of telluride in the family. Compared to its cousins of oxides, sulfides and selenides, KErTe₂ retains the high symmetry of R3m and Er³⁺ ions still sit on a perfect triangular lattice. The separation between adjacent magnetic layers is expectedly increased, which further enhances the two dimensionality of the spin system. Specific heat and magnetic susceptibility measurements on KErTe₂ single crystals reveal no structural and magnetic transition down to 1.8 K. Most interestingly, the absorption spectrum shows that the charge gap of KErTe₂ is roughly 0.93±0.35 eV, which is the smallest among all the reported members in the family. This immediately invokes the interest towards metallization even superconductivity using the compound.

Key words: quantum spin liquids, exchange and superexchange interactions, magnetic anisotropy

中图分类号: (Quantum spin liquids, valence bond phases and related phenomena)

75.10.Kt

75.30.Et (Exchange and superexchange interactions) 75.30.Gw (Magnetic anisotropy)

Weiwei Liu(刘维维), Dayu Yan(闫大禹), Zheng Zhang(张政), Jianting Ji(籍建葶), Youguo Shi(石友国), Feng Jin(金峰), and Qingming Zhang(张清明). Crystal growth and magnetic properties of quantum spin liquid candidate KErTe₂[J]. 中国物理B, 2021, 30(10): 107504-107504.

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Crystal growth and magnetic properties of quantum spin liquid candidate KErTe₂

Crystal growth and magnetic properties of quantum spin liquid candidate KErTe₂

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