论文部分内容阅读
利用红外光源浮区法生长出大尺寸、高质量的磁失措自旋冰化合物Dy2Ti2O7单晶体.X射线衍射实验证实晶体具有面心立方结构,空间群为Fd3m,晶胞参数a=1·0112(2)nm,[111]和[400]方向X射线衍射摇摆曲线半高宽分别仅为0·07°和0·05°.直流磁化率与温度关系测量给出晶体的VanVleck顺磁因子为2·46×10-5m3/mol,有效磁矩μeff=10·24(4)μB,Cure-Weiss温度ΘCW=1·1K,揭示Dy2Ti2O7具有弱的铁磁性.对磁性起源的综合分析表明,该自旋冰晶体磁性质主要来源于磁偶极相互作用,且相关最近邻长程偶极相互作用能量标度Dnn=3·00K.
Large-size and high-quality magnetostrictive spin-ice Dy2Ti2O7 single crystals were grown by using the floating-zone infrared light source method. X-ray diffraction experiments confirmed that the crystal has a face-centered cubic structure with a space group of Fd3m and a unit cell parameter of a = 1.01212 ) nm, [111] and [400] respectively, the FWHM of the X-ray diffraction rocking curves are only -0.07 ° and 0 · 05 °, respectively.The relationship between DC susceptibility and temperature is given by the VanVleck paramagnetic factor of the crystal 46 × 10-5m3 / mol, effective magnetic moment μeff = 10 · 24 (4) μB and Cure-Weiss temperature ΘCW = 1 · 1K, revealing that Dy2Ti2O7 has weak ferromagnetism.A comprehensive analysis of magnetic origin shows that the spin The magnetic properties of ice crystals mainly come from the magnetic dipole interaction, and the energy scale Dnn of the nearest neighbor dipole dipole interaction is 3.00K.