Spin gap in quasi-one-dimensional S=3/2 antiferromagnet CoTi2O5

doi:10.1088/1674-1056/ad1381

中国物理B ›› 2024, Vol. 33 ›› Issue (3): 37505-037505.doi: 10.1088/1674-1056/ad1381

Spin gap in quasi-one-dimensional S=3/2 antiferromagnet CoTi₂O₅

Hao-Hang Xu(徐浩航)¹, Qing-Yuan Liu(刘庆元)^1,5, Chao Xin(辛潮)², Qin-Xin Shen(申沁鑫)³, Jun Luo(罗军)³, Rui Zhou(周睿)³, Jin-Guang Cheng(程金光)³, Jian Liu(刘健)⁴, Ling-Ling Tao(陶玲玲)¹, Zhi-Guo Liu(刘志国)¹, Ming-Xue Huo(霍明学)⁴, Xian-Jie Wang(王先杰)¹, and Yu Sui(隋郁)^1,4,†

1 School of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 School of Science, Changchun University of Science and Technology, Changchun 130022, China;
3 Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
4 Laboratory for Space Environment and Physical Sciences, Harbin Institute of Technology, Harbin 150001, China;
5 Southwest Institute of Applied Magnetics, Mianyang 621000, China

收稿日期:2023-09-15 修回日期:2023-11-26 接受日期:2023-12-08 出版日期:2024-02-22 发布日期:2024-02-29
通讯作者: Yu Sui E-mail:suiyu@hit.edu.cn
基金资助:
his work was supported by the National Natural Science Foundation of China (Grant No. 52372003) and the Funds from Beijing National Laboratory for Condensed Matter Physics. A portion of this work was carried out at the Synergetic Extreme Condition User Facility (SECUF).

Spin gap in quasi-one-dimensional S=3/2 antiferromagnet CoTi₂O₅

1 School of Physics, Harbin Institute of Technology, Harbin 150001, China;
2 School of Science, Changchun University of Science and Technology, Changchun 130022, China;
3 Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
4 Laboratory for Space Environment and Physical Sciences, Harbin Institute of Technology, Harbin 150001, China;
5 Southwest Institute of Applied Magnetics, Mianyang 621000, China

Received:2023-09-15 Revised:2023-11-26 Accepted:2023-12-08 Online:2024-02-22 Published:2024-02-29
Contact: Yu Sui E-mail:suiyu@hit.edu.cn
Supported by:
his work was supported by the National Natural Science Foundation of China (Grant No. 52372003) and the Funds from Beijing National Laboratory for Condensed Matter Physics. A portion of this work was carried out at the Synergetic Extreme Condition User Facility (SECUF).

1. 附件.pdf(463KB)

摘要/Abstract

摘要： Quasi-one-dimensional (1D) antiferromagnets are known to display intriguing phenomena especially when there is a spin gap in their spin-excitation spectra. Here we demonstrate that a spin gap exists in the quasi-1D Heisenberg antiferromagnet CoTi₂O₅ with highly ordered Co²⁺/Ti⁴⁺ occupation, in which the Co²⁺ ions with S=3/2 form a 1D spin chain along the a-axis. CoTi₂O₅ undergoes an antiferromagnetic transition at T_N ~ 24 K and exhibits obvious anisotropic magnetic susceptibility even in the paramagnetic region. Although a gapless magnetic ground state is usually expected in a quasi-1D Heisenberg antiferromagnet with half-integer spins, by analyzing the specific heat, the thermal conductivity, and the spin-lattice relaxation rate (1/T₁) as a function of temperature, we found that a spin gap is opened in the spin-excitation spectrum of CoTi₂O₅ around T_N, manifested by the rapid decrease of magnetic specific heat to zero, the double-peak characteristic in thermal conductivity, and the exponential decay of 1/T₁ below T_N. Both the magnetic measurements and the first-principles calculations results indicate that there is spin-orbit coupling in CoTi₂O₅, which induces the magnetic anisotropy in CoTi₂O₅, and then opens the spin gap at low temperature.

关键词: quasi-one-dimensional antiferromagnet, magnetic anisotropy, spin gap

Abstract: Quasi-one-dimensional (1D) antiferromagnets are known to display intriguing phenomena especially when there is a spin gap in their spin-excitation spectra. Here we demonstrate that a spin gap exists in the quasi-1D Heisenberg antiferromagnet CoTi₂O₅ with highly ordered Co²⁺/Ti⁴⁺ occupation, in which the Co²⁺ ions with S=3/2 form a 1D spin chain along the a-axis. CoTi₂O₅ undergoes an antiferromagnetic transition at T_N ~ 24 K and exhibits obvious anisotropic magnetic susceptibility even in the paramagnetic region. Although a gapless magnetic ground state is usually expected in a quasi-1D Heisenberg antiferromagnet with half-integer spins, by analyzing the specific heat, the thermal conductivity, and the spin-lattice relaxation rate (1/T₁) as a function of temperature, we found that a spin gap is opened in the spin-excitation spectrum of CoTi₂O₅ around T_N, manifested by the rapid decrease of magnetic specific heat to zero, the double-peak characteristic in thermal conductivity, and the exponential decay of 1/T₁ below T_N. Both the magnetic measurements and the first-principles calculations results indicate that there is spin-orbit coupling in CoTi₂O₅, which induces the magnetic anisotropy in CoTi₂O₅, and then opens the spin gap at low temperature.

Key words: quasi-one-dimensional antiferromagnet, magnetic anisotropy, spin gap

中图分类号: (Antiferromagnetics)

75.50.Ee

75.30.Gw (Magnetic anisotropy)

Hao-Hang Xu(徐浩航), Qing-Yuan Liu(刘庆元), Chao Xin(辛潮), Qin-Xin Shen(申沁鑫), Jun Luo(罗军), Rui Zhou(周睿), Jin-Guang Cheng(程金光), Jian Liu(刘健), Ling-Ling Tao(陶玲玲), Zhi-Guo Liu(刘志国), Ming-Xue Huo(霍明学), Xian-Jie Wang(王先杰), and Yu Sui(隋郁). Spin gap in quasi-one-dimensional S=3/2 antiferromagnet CoTi₂O₅[J]. 中国物理B, 2024, 33(3): 37505-037505.

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Spin gap in quasi-one-dimensional S=3/2 antiferromagnet CoTi₂O₅

Spin gap in quasi-one-dimensional S=3/2 antiferromagnet CoTi₂O₅

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