ISSN:
1434-6036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Powder neutron diffraction investigations performed in the temperature range from 20 mK to 300K prove that the magnetic Nd moments of the superconductor NdBa2Cu3O6.86 withT c=88 K order three-dimensionally (3D) antiferromagnetic belowT N=(551±10) mK. As in similar Gd and Dy compounds the corresponding wave vector isk=[1/2, 1/2, 1/2]. In approximate agreement with crystal field calculations the ordered magnetic moment of Nd amounts at saturation to (1.14±0.06) μ B and at 25 mK the magnetic moments are oriented parallel [0,0,1]. The transition to the magnetically ordered state corresponds to the Landau type critical exponent β≈0.5, in contrast to the predominant 2D character of such heavy rare-earth systems. The crystal structure of NdBa2Cu3O6.86 is orthorhombic similar to the one of YBa2Cu3O7−x.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01307384
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