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The first study of antiferromagnetic eosphorite-childrenite series (Mn1−xFex)AlP(OH)2H2O (x=0.5)

Authors :
Sohyun Park
Christian Pfleiderer
Georg Benka
Yusuke Wakabayashi
Tsuyoshi Kimura
Bjoern Pedersen
David Behal
Benedikt Röska
Source :
Journal of Magnetism and Magnetic Materials. 428:17-27
Publication Year :
2017
Publisher :
Elsevier BV, 2017.

Abstract

This study presents for the first time the antiferromagnetic structure of the eosphorite-childrenite series (Mn1-xFex)AlPO4(OH)2H2O (x=0.5), based on neutron single crystal diffraction at 3 K in combination with group theoretical representation analysis. The new magnetic structure is described in the magnetic space group PCmnb, maintaining the atomistic unit cell size (a×b×c) with a ~6.9 A, b ~10.4 A, c ~13.4 A. Mn-rich and Fe-rich zones within solid solution crystals are expanded up to several hundred micrometers, as seen in electron microprobe and polarisation microscopy. Magnetic susceptibility and specific heat measurements on two different eosphorite-childrenite crystals show the magnetic transition temperature between 6.5 K and 6.8 K as the Mn2+/Fe2+ ratio varies over single compositional zones. Below the Neel temperature, a magnetic field between 1.5 T and 2 T parallel to the a-axis causes a 180° spin-flip, reaching the saturation (5.25 μB pfu) toward high magnetic fields.

Details

ISSN :
03048853
Volume :
428
Database :
OpenAIRE
Journal :
Journal of Magnetism and Magnetic Materials
Accession number :
edsair.doi...........2e9a67488a46c75046ad648431b4837d
Full Text :
https://doi.org/10.1016/j.jmmm.2016.12.013