Observations of Short-Range Order by Optical Birefringence in Quadratic-Layer Antiferromagnets K_2NiF_4,Rb_2NiF_4,Ba_2NiF_6 and K_2CoF_4
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概要
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By measuring optical birefringences the behaviour of short-range order has beenstudied on quadratic-layer quasi-Heisenberg antiferromagnets : K.NiF., Rb.NiF.,Ba.NiF, and K.CoF.. An explicit form of the spin-dependent birefringence forthese systems is given, which is proportional to the nearest-neighbouring cor-relation functions<.SjS l >. It is shown that with increasing Ising-like characterthe high tempet'ature persistence of<S7,5Z>is rc:duced. In the case of K2C0F.,where the Ising-like anisotropy is comparable to the isotropic exchange field,a symmetric and logarithmic anomaly in the behaviour of<,SjS,) has beenobserved for 17' -7Nl/7'N<7.5'l0 " afound the Neel point.
- 社団法人日本物理学会の論文
- 1978-11-15
著者
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NAGATA Kazukiyo
Department of Physics, Faculty of Engineering, Kanagawa University
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IIO Katsunori
Department of Physics,Faculty of Science,Tokyo Institute of Technology
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Iio Katsunori
Department Of Physics College Of Science Tokyo Institute Of Technology
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Iio Katsunori
Department Of Physics (cond. Mat. Phys.) Graduate School Of Science And Engineering Tokyo Institute
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Nagata Kazukiyo
Department Of Physics College Of Science Tokyo Institute Of Technology
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SAKATANI Mitsuo
Department of Physics,College of Science,Tokyo Institute of Technology
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Sakatani Mitsuo
Department Of Physics College Of Science Tokyo Institute Of Technology
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