Abstract
Spin-lattice (SL) coupling plays an important role in spintronic applications given its effects on magnetic, ferroelectric, optical, and thermodynamic properties. Experiments and theoretical calculations have revealed a large SL coupling effect in CrGeTe3 and CrI3 monolayers. However, the microscopic origin of SL coupling in these systems is still unclear. In this work, we develop a systematic method to explore the atomistic mechanism of SL coupling based on the density functional theory. We find that the first- and second-order SL couplings in ternary system CrGeTe3 are considerably stronger than those in binary system CrI3. For the first-order SL coupling, the Cr ions of the magnetic pair and Ge ions positively contribute to the strain enhancement of ferromagnetism in CrGeTe3. However, the Cr ions provide a negative contribution in CrI3. Furthermore, our tight-binding analysis suggests that the p-d hopping in CrGeTe3 gradually decreases with the tensile strain, rapidly enhancing the ferromagnetism under the tensile strain. The large frequency shifts in CrGeTe3 are caused by the large second-order exchange derivatives (one type of second-order SL coupling) of the Cr ions of the magnetic pair.
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The work at Fudan was supported by the National Natural Science Foundation of China (Grant Nos. 11825403, and 11804138), and the Program for Professor of Special Appointment (Eastern Scholar). JunSheng Feng was supported by Anhui Provincial Natural Science Foundation (Grant No. 1908085MA10), and the Opening Foundation of State Key Laboratory of Surface Physics Fudan University (Grant No. KF2019_07).
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Li, J., Feng, J., Wang, P. et al. Nature of spin-lattice coupling in two-dimensional CrI3 and CrGeTe3. Sci. China Phys. Mech. Astron. 64, 286811 (2021). https://doi.org/10.1007/s11433-021-1717-9
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DOI: https://doi.org/10.1007/s11433-021-1717-9