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:
CreatorsEmailORCIDORCID Put Code
Wasser, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schneidewind, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sidis, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wurmehl, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aswartham, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Buechner, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Braden, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-407342
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:
KeywordsLanguage
IRON-BASED SUPERCONDUCTOR; ANISOTROPY; ORDER; STATEMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/40734

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