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arXiv · 2109.11751

Temperature-dependent structure and magnetization of YCrO$_3$ compound

Qian Zhao·Yinghao Zhu·Si Wu·Junchao Xia·Pengfei Zhou·Kaitong Sun·Hai-Feng Li
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Abstract

We have grown a YCrO$_3$ single crystal by the floating-zone method and studied its temperature-dependent crystalline structure and magnetization by X-ray powder diffraction and PPMS DynaCool measurements. All diffraction patterns were well indexed by an orthorhombic structure with space group of $Pbnm$ (No. 62). From 36 to 300 K, no structural phase transition occurs in the pulverized YCrO$_3$ single crystal. The antiferromagnetic phase transition temperature was determined as $T_\textrm{N} =$ 141.58(5) K by the magnetization versus temperature measurements. We found weak ferromagnetic behavior in the magnetic hysteresis loops below $T_\textrm{N}$. Especially, we demonstrated that the antiferromagnetism and weak ferromagnetism appear simutaniously upon cooling. The lattice parameters ($a$, $b$, $c$, and $V$) deviate downward from the Gr$\ddot{\textrm{u}}$neisen law, displaying an anisotropic magnetostriction effect. We extracted temperature variation of the local distortion parameter $\Delta$. Compared to the $\Delta$ value of Cr ions, Y, O1, and O2 ions show one order of magnitude larger $\Delta$ values indicative of much stronger local lattice distortions. Moreover, the calculated bond valence states of Y and O2 ions have obvious subduction charges.

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Qian Zhao, Yinghao Zhu, Si Wu, Junchao Xia, Pengfei Zhou, Kaitong Sun, Hai-Feng Li. 2021-09-24. Temperature-dependent structure and magnetization of YCrO$_3$ compound. https://doi.org/10.1088/1674-1056/ac2b23

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