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 diffracti...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 K to 300 K,no structural phase transition occurs in the pulverized YCrO_(3)single crystal.The antiferromagnetic phase transition temperature was determined as T_(N)=141.58(5)K by the magnetization versus temperature measurements.We found weak ferromagnetic behavior in the magnetic hysteresis loops below TN.Especially,we demonstrated that the antiferromagnetism and weak ferromagnetism appear simultaneously upon cooling.The lattice parameters(a,b,c,and V)deviate downward from the Grüneisen law,displaying an anisotropic magnetostriction effect.We extracted temperature variation of the local distortion parameterΔ.Compared to theΔvalue of Cr ions,Y,O1,and O2 ions show one order of magnitude largerΔvalues indicative of much stronger local lattice distortions.Moreover,the calculated bond valence states of Y and O2 ions have obvious subduction charges.展开更多
基金the opening project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure(Grant No.SKL201907SIC)Science and Technology Development Fund,Macao SAR,China(File Nos.0090/2021/A2 and 0051/2019/AFJ)+2 种基金Guangdong Basic and Applied Basic Research Foundation,China(GuangdongDongguan Joint Fund No.2020B1515120025)University of Macao(MYRG2020-00278-IAPME and EF030/IAPMELHF/2021/GDSTIC)Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology(Grant No.2019B121205003)。
文摘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 K to 300 K,no structural phase transition occurs in the pulverized YCrO_(3)single crystal.The antiferromagnetic phase transition temperature was determined as T_(N)=141.58(5)K by the magnetization versus temperature measurements.We found weak ferromagnetic behavior in the magnetic hysteresis loops below TN.Especially,we demonstrated that the antiferromagnetism and weak ferromagnetism appear simultaneously upon cooling.The lattice parameters(a,b,c,and V)deviate downward from the Grüneisen law,displaying an anisotropic magnetostriction effect.We extracted temperature variation of the local distortion parameterΔ.Compared to theΔvalue of Cr ions,Y,O1,and O2 ions show one order of magnitude largerΔvalues indicative of much stronger local lattice distortions.Moreover,the calculated bond valence states of Y and O2 ions have obvious subduction charges.
