Spin Fluctuations in an Octahedral Antiferromagnet Mn_3Pt Alloy (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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A new spin frustration system with an octahedral configuration of magnetic atoms was found. In neutron scattering measurements for an ordered Mn_3Pt alloy, inelastic diffuse scattering intensity distributes along the first Brillouin zone-boundary of the fee structure in the paramagnetic and the F-phases. Within the calculations based on a RPA, the experimental data in the paramagnetic phase are reproduced using antiferromagnetic couplings between the spins up to the third-neighbor exchange interactions. In the F-phase below the Neel temperature, a part of the Mn spins still fluctuates at the special site. The existence of the F-phase is a characteristic of the octahedral spin frustration system. The effects of the chemical disorder on the spin frustration are also studied using a specimen with a small atomic LRO parameter.
- 社団法人日本物理学会の論文
- 2003-10-15
著者
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TSUNODA Yorihiko
School of Science and Engineering, Waseda University
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Tsunoda Yorihiko
School Of Science And Engineering Waseda University
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IKEDA Takashi
School of Agriculture, Meiji University
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Ikeda T
Department Of Physics Chuo University
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TSUNODA Yorihiko
School of Science and Engineering ,Waseda University
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