On the Theory of Spin Fluctuations around the Magnetic Instabilities Effects of Zero-Point Fluctuations
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概要
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Efl'ects of' tenaper?tture variation of the zero-point spin flttctuations on the self-consistent renor-unalization (SCR) theory of' spin fltrctuations around the uaaagnetic instabilities are discussed. Intwo and three diztaensional f'erroraaagraets and three dinaensional antif'errortaagnets the effect isnaostly to renorutaalize the raaode-naode cotrpling constant. The renormalized x'altte, corresponding to the experirnental vttlvre, has a finite trpper bovrnd corresponding to a divergent raaean fieldvalue. In two-ditaaensional stntif'er'ronaagnets the critical behaviors of the staggered sttsceptibilityand the ntuclear spin-lattice relaxation r?tte are rnodified by logarithrnic corrections while thiscorrection hardly appears in those of' the electrical resistivity and the specific heat. The termperature varisttion of the mean sqtrare loc?r1 artaplitude of the spin density arotrnd the rtaagneticinstability is sttrdied by using 21 siuaaple unodel for the dynarnical strsceptibility and is applied todiscuss a general trend in the naagneto-voltttaae effects in weak itinerant naagnets. Possible originsof the laroe therraual exp?tnsion and the large low texnjceratvxre coefficient of the specific heat inrnagnetically frtrstrated systetaas are also disctrssed,
- 社団法人日本物理学会の論文
- 1998-11-15
著者
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Moriya Toru
Department Of Physics Faculty Of Science And Technology Science University Of Tokyo
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Ishigaki Aya
Department Of Industrial Administration Tokyo University Of Science
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Moriya Toru
Deparment Of Physics Wasea University
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