Tricritical point and phase diagram based on critical scaling in the monoaxial chiral helimagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="bold">Cr</mml:mi><mml:mrow><mml:mn mathvariant="bold">1</mml:mn><mml:mo>/</mml:mo><mml:mn mathvariant="bold">3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="bold">NbS</mml:mi><mml:mn mathvariant="bold">2</mml:mn></mml:msub></mml:mrow></mml:math>

Hui Han, Lei Zhang, Deepak Sapkota, Ningning Hao, Langsheng Ling, Haifeng Du, Li Pi, Changjin Zhang, David Mandrus, Yuheng Zhang

Abstract

In this work, the magnetism of the single crystal Cr$_{1/3}$NbS$_{2}$, which exhibits chiral magnetic soliton lattice (CSL) state, is investigated. The magnetization displays strong magnetic anisotropy when the field is applied perpendicularly and parallel to the $c$-axis in low field region ($H<H_{S}$, $H_{S}$ is the saturation field). The critical exponents of Cr$_{1/3}$NbS$_{2}$ are obtained as $\beta=$ 0.370(4), $\gamma=$ 1.380(2), and $\delta=$ 4.853(6), which are close to the theoretical prediction of three-dimensional Heisenberg model. Based on the scaling equation and the critical exponents, the $H-T$ phase diagram in the vicinity of the phase transition is constructed, where two critical points are determined. One is a tricritical point which locates at the intersection between the CSL, forced ferromagnetic (FFM), and paramagnetic (PM) states. The other one is a critical point situated at the boundaries between CSL, helimagnetic (HM), and PM states.

Locations

• Physical review. B./Physical review. B - View - PDF
• arXiv (Cornell University) - View - PDF
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