The isothermal section of the phase diagrams of ternary V-Mn-Sn and V-Mn-Sb systems has been investigated at 770 and 870 K, respectively. No ternary compounds were observed. The systems are characterised by the existence of solid solutions based on the binary compounds. The temperature dependence of the electrical resistivity and differential thermopower for (V,Mn)(3)Sb solid solution has been measured. (C) 2001 Elsevier Science B.V. All rights reserved.
Giant magnetoresistance and magnetocaloric effects of the Mn1.82V0.18Sb compound
作者:Yu Qin Zhang、Zhi Dong Zhang
DOI:10.1016/s0925-8388(03)00643-1
日期:2004.2
A giant magnetoresistance effect in the Mn(1.82)Vo(0.18)Sb compound is reported, which is associated with a first-order metamagnetic transition from an antiferromagnetic to a ferrimagnetic state, induced by an external field. The largest GMR ratio equals 26% for Mn1.82V0.18Sb and is achieved at 250 K in a field of 5 T. The origin of the GMR effect is ascribed to the reconstruction of the Fermi surface due to the collapse of the super-zone gap after the metamagnetic transition. In addition, a magnetocaloric effect with a magnetic-entropy change of -5.5 J/kg K is observed in this compound around the magnetic transition temperature. (C) 2003 Elsevier B.V. All rights reserved.