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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 |
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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 TN ~ 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 TN, 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 TN. 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.
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Received: 15 September 2023
Revised: 26 November 2023
Accepted manuscript online: 08 December 2023
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PACS:
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75.50.Ee
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(Antiferromagnetics)
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75.30.Gw
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(Magnetic anisotropy)
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| Fund: 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). |
Corresponding Authors:
Yu Sui
E-mail: suiyu@hit.edu.cn
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Cite this article:
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 2024 Chin. Phys. B 33 037505
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