Thermodynamically stable skyrmion lattice at low temperatures in a bulk crystal of lacunar spinel GaV4Se8

被引：110

作者：

Fujima, Y. ^{[1
]}

Abe, N. ^{[1
]}

Tokunaga, Y. ^{[1
]}

Arima, T. ^{[1
]}

机构：

[1] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 18期

基金：

日本学术振兴会;

关键词：

STRUCTURAL PHASE-TRANSITION; RAY-POWDER DIFFRACTION; MAGNETIC SKYRMIONS; COMPOUND; GAMO4S8;

D O I：

10.1103/PhysRevB.95.180410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic field-temperature (H-T) phase diagram of a lacunar spinel GaV4Se8 is determined by means of ac magnetic susceptibility and magnetoelectric measurements on single crystals and classical Monte Carlo simulation. GaV4Se8 is pyroelectric below the structural phase transition temperature T-S = 41 K and magnetically ordered below T-C = 17.5 K. Ac magnetic susceptibility measurement has revealed that GaV4Se8 undergoes successive magnetic phase transitions with increasing applied magnetic field. Each phase is assigned to cycloidal, skyrmion lattice, and forced ferromagnetic phases. Both cycloidal and skyrmion-lattice magnetic orders induce electric polarization up to around 10 mu C/m(2) compared with ferromagnetic order, suggesting a spin-driven magnetoelectric nature in GaV4Se8. The skyrmion lattice phase seems to be stable down to T = 2 K and up to mu H-0 = 370 mT. This enhanced stability of skyrmion lattice in GaV4Se8 compared with GaV4S8 may provide a key to understanding the formation mechanism of the skyrmion lattice.

引用

页数：5

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