Abstract
Magnetic ordering in NdMn2 has been studied by magnetization measurements and powder X-ray and neutron diffraction experiments. Giant magnetoelastic effects giving rise to both a large magnetovolume effect and a monoclinic crystal distortion at the magnetic ordering are found. A magnetic structure with two different propagation vectors and an unusual decoupling phenomenon is deduced. All these effects are discussed and shown to lead to reduction in the high frustration of the Mn magnetism in NdMn2. A reorientation process involving the Nd moments and only a quarter of the Mn moments is also found with decreasing temperature and is discussed in terms of the Mn and Nd anisotropy.
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