This study explores the bulk crystal growth, structural characterization, and physical property measurements of the cubic double perovskite Ba_2CoWO_6(BCWO). In BCWO, Co+2 ions form a face-centered cubic (FCC) lattice with non-distorted cobalt octahedra. The compound exhibits long-range antiferromagnetic order below TN = 14 K. Magnetization data indicated a slight anisotropy along with a spin-flop transition at 10 kOe , a saturation field of 310 kOe and an ordered moment of 2.17 Mu_B at T = 1.6 K. Heat capacity measurements indicate an effective j = 1/2 ground state configuration, resulting from the combined effects of the crystal electric field and spin-orbit interaction. Surface photovoltage analysis reveals two optical gaps in the UV-Visible region, suggesting potential applications in photocatalysis and photovoltaics. The magnetic and optical properties highlight the significant role of orbital contributions within BCWO, indicating various other potential applications.
Interplay between Heavy Fermions and Crystal Field Excitation in Kondo Lattices. Low-Temperature Thermodynamics and Inelastic Neutron Scattering Spectra of CeNiSn
Thermodynamic evidence for nematic superconductivity in Cu$_x$Bi$_2$Se$_3$
非常规超导的特征在于宏观超导波函数的自发对称性破缺，以及规范对称性破缺，例如相对于基本晶格对称性的旋转对称性破缺。特别是，超导性与自发的旋转对称性破缺的波函数振幅，从而在体的性质，尚未报告以前，是有趣的，可以被称为“双”超导性的类比，以双液晶相。在这里，基于比热测量的单晶Cu $_x$ Bi $_2$ Se $_3$精确的磁场方向控制下，我们报告的热力学证据的超导性，即，明确的双重对称行为的三角晶格。结果表明，实现了一个“奇宇称”的状态，只有宏观量子凝聚体和不同的液晶中的双态。结果也证实了Cu $_x$ Bi $_2$ Se $_3$的拓扑非平凡超导电性。
