Yet again, new compounds found in systems with known binary phase diagrams. Synthesis, crystal and electronic structure of Nd<sub>3</sub>Bi<sub>7</sub>and Sm<sub>3</sub>Bi<sub>7</sub>
作者:Alexander Ovchinnikov、Julien P. A. Makongo、Svilen Bobev
DOI:10.1039/c8cc02563k
日期:——
The binary bismuthides Nd3Bi7 and Sm3Bi7 were synthesized and structurally characterized for the first time. The results from the calorimetric analysis show that both compounds are stable only up to about 500 °C, which may explain why they were overlooked during the original assessment of the corresponding phase diagrams.
首次合成了二元铋化物Nd 3 Bi 7和Sm 3 Bi 7。量热分析的结果表明,这两种化合物仅在约500°C的温度下才稳定,这可以解释为什么在最初评估相应相图时忽略了它们。
Electrical transport properties of semimetallic Gd<i>X</i>single crystals (<i>X</i>=P, As, Sb, and Bi)
作者:D. X. Li、Y. Haga、H. Shida、T. Suzuki、Y. S. Kwon
DOI:10.1103/physrevb.54.10483
日期:——
The large single crystals of stoichiometric and nonstoichiometric Gd monopnictides GdX (X=P, As, Sb, and Bi) are grown by the mineralization method (for X=P and As) and Bridgman method (for X=Sb and Bi). A systematic investigation of the transport properties of GdX single crystals is presented. We report on measurements of the electric resistivity rho(T), magnetoresistance rho(H), and Hall effect performed on the stoichiometric and nonstoichiometric samples at temperatures between 1.6 and 300 K in magnetic fields up to 10 T. The stoichiometric samples behaved as the well-compensated semimetals that order antiferromagnetically at Neel temperatures T-N=15.9 K for GdP, 18.7 K for GdAs, 23.4 K for GdSb, and 25.8 K for GdBi. The transverse magnetoresistance measured at low temperature follows a rho(H)proportional to H-2 law, and a larger positive ratio MRR=[rho(H)-rho(0)]/rho(0) is observed at 10 T for the four stoichiometric samples. The temperature dependence of the resistivity can be explained by the d-f Coulomb exchange interaction at lower temperatures. The Hall-effect measurements yield a carrier concentration n=2.1x10(20) cm(-3) for GdAs and n=4.2x10(20) cm(-3) for GdSb, which are in a good agreement with the de Haas-van Alphen effect measurements. The nonstoichiometric samples showed some anomalies that could be explained qualitatively by the model of trapped magnetic polaron.