单晶中子衍射研究了UAs 0.97Se 0.03中T N以下出现的不对称相( Modification of the magnetic structure of UAs — Appearance of an incommensurate phase below T N in UAs 0.97Se 0.03, studied by neutron diffraction from a single crystal )

M Kuznietz P Burlet J Rossat-Mignod O Vogt Experimental/ antiferromagnetic properties of substances commensurate-incommensurate transformations magnetic moments magnetic structure magnetic transitions neutron diffraction examination of materials uranium compounds/ magnetic transitions first order transitions second order transitions magnetic structure incommensurate phase UAs 0.97Se 0.03 neutron diffraction single crystal antiferromagnetic magnetic moment/ A7525 Spin arrangements in magnetically ordered materials A7530K Magnetic phase boundaries A7550E Antiferromagnetics

用中子衍射方法研究了零磁场作用下UAs0.97Se0.03单晶的磁结构。发现它是反铁磁的，在T o=75.6K以下为-Ia型(++-),在T o以上为-I(+-+-)。I型一直存在到T IC=113.5K,而在T IC=113.5K以上，直到T N=122K时，出现了一个不公度相，从而改变了纯UAS的磁结构。波器K（沿立方轴方向）的K值在T N处由0.642变化到T ic处由0.652变化。T o和T IC处的跃迁为一级跃迁，而T N处的跃迁为二级跃迁。在T=4.2K时，有序磁矩为2.15μB，在T=75.4K时，有序磁矩平稳地变化到1.95μB，在T=76K时，有序磁矩急剧下降到1.47μB。

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