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Abstract

Uranium and transuranium compounds are amongst the richest systems with regard to their magnetic properties. However, few experiments are conducted on transuranium materials because of the decreasing number of organisations able to handle them. At ITU-Karlsruhe, we have developed an "Actinides user laboratory" concept in offering access to our infrastructure and equipment to external users. We illustrate the capabilities offered through SQUID magnetometry studies recently undertaken on a single crystal of the NpP monopnictide. This neptunium compound orders at TN of 114 K into an incommensurate antiferromagnetic phase and undergoes a first order transition at Tic of 73 K to a commensurate structure with an associated tetragonal distortion of the lattice. In this paper, we revisit and complement the intricate magnetic phase diagram. An additional metamagnetic phase is observed at low temperature and interpreted as the missing intermediate step between the low field (3+3-) magnetic structure and the high field ferromagnetic phase.

Additional information

Authors: WASTIN F ET AL, European Commission, Joint Research Centre, Institute for Transuranium Elements, Karlsruhe (DE)
Bibliographic Reference: An oral report given at: Actinides 2001 International Conference. Organised by: Japan Atomic Energy Research Institute and Atomic Energy Society of Japan. Held in: Hayama (JP), 4-11 November 2001.
Record Number: 200214359 / Last updated on: 2002-02-15
Category: PUBLICATION
Original language: en
Available languages: en
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