Universität zu Köln

Wasser, Florian, Park, Jitae T., Aswartham, Saicharan ORCID: 0000-0001-9006-9797, Wurmehl, Sabine, Sidis, Yvan, Steffens, Paul, Schmalzl, Karin, Buechner, Bernd and Braden, Markus ORCID: 0000-0002-9284-6585 (2019). Strong spin resonance mode associated with suppression of soft magnetic ordering in hole-doped Ba1-xNaxFe2As2. npj Quantum Mater., 4. LONDON: NATURE PUBLISHING GROUP. ISSN 2397-4648

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Abstract

Spin-resonance modes (SRM) are taken as evidence for magnetically driven pairing in Fe-based superconductors, but their character remains poorly understood. The broadness, the splitting and the spin-space anisotropies of SRMs contrast with the mostly accepted interpretation as spin excitons. We study hole-doped Ba1-xNaxFe2As2 that displays a spin reorientation transition. This reorientation has little impact on the overall appearance of the resonance excitations with a high-energy isotropic and a low-energy anisotropic mode. However, the strength of the anisotropic low-energy mode sharply peaks at the highest doping that still exhibits magnetic ordering resulting in the strongest SRM observed in any Fe-based superconductor so far. This remarkably strong SRM is accompanied by a loss of about half of the magnetic Bragg intensity upon entering the SC phase. Anisotropic SRMs thus can allow the system to compensate for the loss of exchange energy arising from the reduced antiferromagnetic correlations within the SC state.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wasser, Florian UNSPECIFIED UNSPECIFIED UNSPECIFIED Park, Jitae T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aswartham, Saicharan UNSPECIFIED orcid.org/0000-0001-9006-9797 UNSPECIFIED Wurmehl, Sabine UNSPECIFIED UNSPECIFIED UNSPECIFIED Sidis, Yvan UNSPECIFIED UNSPECIFIED UNSPECIFIED Steffens, Paul UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmalzl, Karin UNSPECIFIED UNSPECIFIED UNSPECIFIED Buechner, Bernd UNSPECIFIED UNSPECIFIED UNSPECIFIED Braden, Markus UNSPECIFIED orcid.org/0000-0002-9284-6585 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-124803
DOI:	10.1038/s41535-019-0198-4
Journal or Publication Title:	npj Quantum Mater.
Volume:	4
Date:	2019
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	2397-4648
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SUPERCONDUCTIVITY Multiple languages Materials Science, Multidisciplinary; Quantum Science & Technology; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/12480