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High pressure studies were performed on the neptunium pnictides NpAs and NpBi via electrical resistance up to approximately 25 GPa between 1.3 K and room temperature, and on a high pressure investigation up to 9 GPa and at 4.2 K on NpSb using (237)Np Mössbauer spectroscopy. In NpX (X = As, Sb, Bi) crystallizing in the cubic NaCl phase the ground state is antiferromagnetic and displays a noncollinear 3k spin structure. The strong increase of the resistivity with decreasing temperature observed in the temperature range of the 3k order at ambient pressure collapses at 0.23 (NpAs), 2.7 (NpSb) and 3.9 GPa (NpBi). No significant change of the hyperfine interactions is found in NpAs or NpSb at the pressure where the resistance collapse is observed.

Additional information

Authors: ICHAS V, JRC Karlsruhe (DE);ZWIRNER S, JRC Karlsruhe (DE);SPIRLET J C, JRC Karlsruhe (DE);REBIZANT J, JRC Karlsruhe (DE);BRAITHWAITE D, CEA, CEN Grenoble (FR)
Bibliographic Reference: Article: Physical Review B Condensed Matter
Record Number: 199710672 / Last updated on: 1997-06-10
Original language: en
Available languages: en