Magnetic and Electrical Properties of Manganese Telluride

概要

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The temperature dependence of the susceptibility of the antiferro-magnetic compound MnTe was measured over a range of temperature between liquid nitrogen temperature and 720℃. An abrupt change in slope and a maximum of the susceptibility curve were found at 37℃ and at 55℃ respectively. These results are compared with the observed Neel temperatures previously reported by Squire and by Serre. A thermal hysteresis was also found above the Neel temperature, relating to the heat history of the specimen. It is shown that the susceptibility of MnTe_<1+x>(0≦x≦1), where x is the excess content of tellurium, is explicable in terms of two phases, MnTe and MnTe_2 which posses different susceptibilities. The electrical properties, i.e., the resistivity, the thermo-emf and the Hall emf, were measured as functions of temperature. Evidence was found of anomalous behaviours at the Neel temperature for them. A large thermal hysteresis of the resistivity is also found above the Neel temperature, which suggests a change of the crystal structure at about 130℃.
社団法人日本物理学会の論文
1956-01-05