Possible emergence of a skyrmion phase in ferroelectric GaMoS
arXiv:1906.03399 · doi:10.1103/PhysRevB.99.214427
Abstract
Polar lacunar spinels, such as GaVS and GaVSe, were proposed to host skyrmion phases under magnetic field. In this work, we put forward, as a candidate for Néel-type skyrmion lattice, the isostructural GaMoS, here systematically studied via both first-principles calculations and Monte Carlo simulations of model Hamiltonian. Electric polarization, driven by Jahn-Teller distortion, is predicted to arise in GaMoS, showing a comparable size but an opposite sign with respect to that evaluated in V-based counterparts and explained in terms of different electron counting arguments and resulting distortions. Interestingly, a larger spin-orbit coupling of 4d orbitals with respect to 3d orbitals in vanadium-spinels leads to stronger Dzyaloshinskii-Moriya interactions, which are beneficial to stabilize a cycloidal spin texture, as well as smaller-sized skyrmions (radius<10 nm). Furthermore, the possibly large exchange anisotropy of GaMo4S8 may lead to a ferroelectric-ferromagnetic ground state, as an alternative to the ferroelectric-skyrmionic one, calling for further experimental verification.
arXiv comment6 figures
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- Antiferromagnetic Skyrmions and Skyrmion Density Wave in Rashba Hund's Insulator
- Skyrmionic order and magnetically induced polarization change in lacunar spinel compounds GaVS and GaMoS: comparative theoretical study
- Magnetoentropic mapping and computational modeling of cycloids and skyrmions in the lacunar spinels GaVS and GaVSe
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