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CVM study of FCC and BCC Ising magnets with generalised spin number
Affiliation:1. Department of Metallurgical and Materials Engineering, Computational Materials Science Laboratory, University of São Paulo, CEP 05508-900 São Paulo-SP, Brazil;2. Max-Planck-Institut für Eisenforschung GmbJ, Postfach 140 444, D-40074 Düsseldorf, Germany;1. Shenzhen Key Laboratory of Advanced Machine Learning and Applications, College of Mathematics and Statistics, Shenzhen University, Shenzhen 518060, China;2. School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 518107, China;1. Christian Doppler Laboratory for Interface and Precipitation Engineering, Institute of Materials Science and Technology, TU Wien, Getreidemarkt 9, 1060, Vienna, Austria;2. Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700, Leoben, Austria;3. MatCalc Engineering GmbH, Gumpendorferstraße 21, 1060, Vienna, Austria;4. Institute of Materials Science and Technology, TU Wien, Getreidemarkt 9, 1060, Vienna, Austria;1. Department of Materials Science and Engineering, Kyushu University, 774, Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;2. International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 774, Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;3. Graduate student, Department of Materials Science and Engineering, Kyushu University, 774, Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;4. Mechanical Electronics Institute, Fukuoka Industrial Technology Center, 3-6-1, Norimatsu, Yahatanishi-ku, Kitakyushu 807-0831, Japan;5. Max-Planck-Institute für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany;1. Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049 Madrid, Spain;2. Texas Materials Institute and Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX 78712, United States
Abstract:Calculations using the cluster variation method (CVM) in the tetrahedron approximation have been applied to multicomponent FCC and BCC Ising systems with spin number up to s=7/2. The magnetic specific heat capacity (CH) of ferro- and antiferromagnetic FCC and BCC systems has been calculated in the first neighbour approximation and compared with data obtained with other methods. A concavity in the CH curve at TTC/2 develops with increasing spin number.
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