Theory of Antiferromagnetic Order in High-T_{\text{c}} Oxides: An Approach Based on Ginzburg--Landau Expansion
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概要
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The mean-field phase diagram of antiferromagnetic order in t--J model has been examined, using the free energy obtained by Ginzburg--Landau (GL) expansion. We extended the usual GL theory in two ways: First, we have included higher order terms with respect to the spatial derivative (or wave number) to incorporate the incommensurate antiferromagnetic order. Second, we have also included higher order terms with respect to the order parameter amplitude, in order to treat the first order phase transition between paramagnetic and antiferromagnetic phase, which appears at some doping rates. We found the possibility of tricritical point and critical endpoint in the magnetic phase diagram of the high-T_{\text{c}} oxides associated with the commensurate and incommensurate antiferromagnetic order. The possible effects of thermal fluctuations and randomness (spin glass) are also discussed qualitatively based on the GL free energy.
- 2013-12-15
著者
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Kuboki Kazuhiro
Department Of Physics Kobe University
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Kuboki Kazuhiro
Department of Physics, Kobe University, Kobe 657-8501, Japan
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Hayashi Masahiko
Faculty of Education and Human Studies, Akita University, Akita 010-8502, Japan
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Tanuma Yasunari
Faculty of Engineering and Resource Science, Akita University, Akita 010-8502, Japan
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