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Ferromagnetic-phase transition in the spinel-type CuCr2Te4 |
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| Authors: | Takeshi Suzuyama Hiroki Yamamoto Masakazu Ito Takao Nakama Shoichi Nagata |
| Affiliation: | a Department of Materials Science and Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran, Hokkaido 050-8585, Japan b Department of Quantum Matter, Graduate School of Advanced Science of Matter, Hiroshima University, Higashi-Hiroshima 739-8526, Japan c Department of Physics, University of the Ryukyus, Okinawa 903-0213, Japan |
| Abstract: | Ferromagnetic-phase transition in spinel-type CuCr2Te4 has been clearly observed. CuCr2Te4 is a telluride-spinel with the lattice constant  , which has been synthesized successfully. The heat capacity exhibits a sharp peak due to the ferromagnetic-phase transition with the Curie temperature  . This value of TC corresponds exactly to that of the negative peak of dM/dT in low field of 1.0 Oe. The magnetic susceptibility shows the Curie-Weiss behavior between 380 and 650 K with the effective magnetic moment  /Cr-ion and the Weiss constant  . The low temperature magnetization indicates the spin-wave excitations, where the existence of first term of Bloch T3/2 law and the next T5/2 term are verified experimentally. This spin-wave excitation is detected up to approximately 250 K which is a fairly high temperature. |
| Keywords: | Spinel-type CuCr2Te4 Telluride-spinel Ferromagnetism Heat capacity Magnetization Magnetic susceptibility Spin-wave excitation |
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