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Effect of strain-induced orbital splitting on the magnetic excitations in undoped cuprates

Title
Effect of strain-induced orbital splitting on the magnetic excitations in undoped cuprates
Authors
Singh, Dheeraj KumarBANG, YUNKYU
Date Issued
15-Jan-2021
Publisher
AMER PHYSICAL SOC
Abstract
We investigate the magnetic excitations in view of the recent reports suggesting that the spin-wave energy may exhibit a significant dependence on the in-plane strain of a thin film of La2CuO4. The nature of dependence, as we find, can be explained naturally within a two-orbital model based on the d(x2)(-y2) and d(3z)(2-r2) orbitals. In particular, as the orbital-splitting energy between the d(x2)(-y2) and d(3z2-)(r2) orbitals increases with compressive strain, the zone-boundary spin-wave energy hardens. However, the hardening persists only until the orbital splitting reaches similar to 2 eV, beyond which there is no significant change. The behavior of zone-boundary spin-wave energy is explained in terms of the extent of hybridization between one of the exchange-split d(x2)(-y2) bands which is nearly half-filled and the d(3z2-)(r2) band. The role of second order antiferromagnetic superexchange process involving the interorbital hopping is also discussed.
Keywords
INSULATOR
URI
http://oasis.postech.ac.kr/handle/2014.oak/104929
ISSN
2469-9950
Article Type
Article
Citation
PHYSICAL REVIEW B, vol. 103, no. 3, 2021-01-15
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