Reduced spin damping in inverse spinel Mn2TiO4 by ordered occupancy of magnetic ions

Li, Qingyuan; Xu, He; Liu, Jian; Liu, Zhiguo; Huo, Mingxue; Wang, Xianjie; Sui, Yu

doi:10.1016/j.jmmm.2021.168864

Cited by 3 publications

(1 citation statement)

References 31 publications

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“…[17,27] In our previous work, we found that the single crystal of inverse spinel Mn 2 TiO 4 with ordered Mn 2+ /Ti 4+ occupation at B sites can be grown by the optical floating zone method under pure Ar atmosphere. [28] Thus, we prepared the CoTi 2 O 5 single crystals with different degrees of Co 2+ /Ti 4+ ordering by using the floating zone technique under pure Ar, pure O 2 , and the Ar/O 2 mixed gas atmosphere.…”

Section: Theoretical Calculationsmentioning

confidence: 99%

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

Xu 徐,

Liu 刘,

Xin 辛

et al. 2024

Chinese Phys. B

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Quasi-one-dimensional (1D) antiferromagnets are known to display intriguing phenomena especially when there is a spin gap in their spin-excitation spectrum. 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/T 1) 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/T 1 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.

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Section: Theoretical Calculationsmentioning

confidence: 99%