Two- and three-dimensional magnetic correlations of tb in Pb2Sr2TbCu3O8

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题名:	Two- and three-dimensional magnetic correlations of tb in Pb2Sr2TbCu3O8
作者:	Wu,SY;Li,WH;Lee,KC;Lynn,JW;Meen,TH;Yang,HD
贡献者:	物理研究所
关键词:	RARE-EARTH IONS;NEUTRON-SCATTERING;ORDER;PR;GD;SUPERCONDUCTIVITY;FLUCTUATIONS;ERBA2CU3O7;BEHAVIOR;ER
日期:	1996
上传时间:	2010-07-08 14:08:10 (UTC+8)
出版者:	中央大學
摘要:	The magnetic order of the Tb ions in polycrystalline Pb(2)Sr(2)TbCu3O(8) has been studied by neutron-diffraction and ac-susceptibility measurements. Magnetic correlations are observed to develop below T approximate to 9 K, and the correlation length diverges at T-N=5.3 K. At high temperatures the in-phase component of the ac susceptibility chi' exhibits Curie-Weiss behavior, while it departs from this behavior as the magnetic correlations between the Tb ions develop, and exhibits a cusp at lower temperatures characteristic of antiferromagnetic ordering. The T-N determined from the critical behavior of the correlation length measured by neutron diffraction is in good agreement with that determined by the relative maximum in d chi'/dT. Both two-dimensional (2D) and three-dimensional Bragg peaks are observed, but the magnetic correlations are predominantly 2D in nature. The sublattice magnetization drops sharply as the critical point is approached, as is typical for low-dimensional systems, and the value of 1.00(5) obtained for the critical exponent nu agrees very well with nu=1 for the S=1/2 2D Ising model.
關聯:	PHYSICAL REVIEW B
显示于类别:	[物理研究所] 期刊論文

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