Analysis of relationship between magnetic property and crystal structure of La_1−xSr_xCrO₃ (x=0.13, 0.15)

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• 作者：Yuhta Matsunaga ; Fumihiko Nakamura ; Hiroki Takahashi ; Takuya Hashimoto
• 关键词：A. Perovskite chromites ; C. Crystal structure and symmetry ; D. Magnetic property ; D. Phase transitions
• 刊名：Solid State Communications
• 出版年：2008
• 出版时间：March 2008
• 年：2008
• 卷：145
• 期：9-10
• 页码：502-506
• 全文大小：792 K

文摘

Dependence of dc magnetization, M, of La_1−xSr_xCrO₃ (x=0.13, 0.15) polycrystalline specimens on external magnetic field, H, was measured at various temperatures. At higher temperatures above 274 K and 265 K for the specimens with x=0.13 and 0.15, respectively, almost linear relationships were observed, indicating paramagnetic property. At the lower temperatures, hystereses, indicating canted antiferromagnetic property, were observed in M–H curves. The temperatures where the magnetic phase transition was observed showed agreement with those where base line shift was observed in differential scanning calorimetry (DSC) measurement. In the M–H curves of La_1−xSr_xCrO₃ (x=0.13, 0.15), saturation magnetization, M_s, was not observed at external magnetic fields as high as 70 kOe. At 226 K and 189 K for the specimens with x=0.13 and 0.15, respectively, structural phase transition from orthorhombic- to rhombohedral-distorted perovskite was observed in DSC curves. At the temperature, abrupt decreases of residual magnetization, M_r, and variation of temperature dependence of coercive force, H_c, were detected. We regard that the abrupt decrease of M_r and the variation of temperature dependence of 11973014d12"" title=""Click to view the MathML source"">H_c at the structural phase transition temperature can be ascribed to discontinuous variation of Cr–O–Cr angles.