Resonant X-Ray Scattering Investigation of Magnetic Ordering in NpAs1-xSex (x = 0.05, 0.10)

A resonant X-ray scattering investigation of the NpAs1-xSex system with single crystals of 5 and 10% Se content is reported. The main features of the magnetic phase diagram previously studied by neutron scattering were confirmed. The coexistence within a single domain of ferro and antiferro components in the low-T ferrimagnetic phase was established, as well as the single-k character of the incommensurate phase and of the antiferromagnetic component of the ferromagnetic phase. A tetragonal lattice distortion was found in the ferro and ferromagnetic phases which is not compatible with the proposed model for the ferromagnetic phase. The study of ferromagnetism was carried out using polarization analysis of the diffracted beam to separate the scattering intensities originating from magnetism and charge, which are superimposed in reciprocal space. The magnetic character of the ferromagnetic signal calculated from the measured intensities in the polarization analysis sp and ss channels was confirmed by analysis of the correspondent temperature dependence.

RODRIGUES V. H.;  PAIXAO J.A.;  COSTA M. M. R.;  MANNIX D.;  BOMBARDI A.;  REBIZANT J.;  LANDER G.H.; 

2011-01-12

IOP PUBLISHING LTD

JRC60779

0953-8984,   

http://iopscience.iop.org/0953-8984/23/2/026002/pdf/0953-8984_23_2_026002.pdf,    https://publications.jrc.ec.europa.eu/repository/handle/JRC60779,   

10.1088/0953-8984/23/2/026002,