Universität zu Köln

Wasser, F., Schneidewind, A., Sidis, Y., Wurmehl, S., Aswartham, S., Buechner, B. and Braden, M. (2015). Spin reorientation in Ba0.65Na0.35Fe2As2 studied by single-crystal neutron diffraction. Phys. Rev. B, 91 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

We have studied the magnetic ordering in Ba1-xNaxFe2As2 with 0.25 <= x <= 0.4 by unpolarized and polarized neutron diffraction using single crystals. Unlike most FeAs-based compounds that magnetically order, Na-doped BaFe2As2 exhibits two successive magnetic transitions: For x = 0.35, upon cooling, magnetic order occurs at similar to 70K with in-plane magnetic moments being arranged as in pure orNi-, Co-, orK-doped BaFe2As2 samples. At a temperature of similar to 46 K a second phase transition occurs, which the single-crystal neutron-diffraction experiments can unambiguously identify as a spin reorientation. At low temperatures, the ordered magnetic moments in Ba0.65Na0.35Fe2As2 point along the c direction. The two nearly degenerate magnetic states document orbital degeneracy to persist in the superconducting phase.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wasser, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneidewind, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sidis, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wurmehl, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aswartham, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buechner, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Braden, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-412239
DOI:	10.1103/PhysRevB.91.060505
Journal or Publication Title:	Phys. Rev. B
Volume:	91
Number:	6
Date:	2015
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1550-235X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language IRON-BASED SUPERCONDUCTOR; ANISOTROPY; ORDER; STATE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/41223