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Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba1-x KxFe2As2

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posted on 27.10.2021, 00:59 by Benjamin MallettBenjamin Mallett, P Marsik, M Yazdi-Rizi, T Wolf, AE Böhmer, F Hardy, C Meingast, D Munzar, C Bernhard
With infrared spectroscopy we investigated the spin-reorientation transition from an orthorhombic antiferromagnetic (o-AF) to a tetragonal AF (t-AF) phase and the reentrance of the o-AF phase in the superconducting state of underdoped Ba1-xKxFe2As2. In agreement with the predicted transition from a single-Q to a double-Q AF structure, we found that a distinct spin density wave develops in the t-AF phase. The pair breaking peak of this spin density wave acquires much more low-energy spectral weight than the one in the o-AF state which indicates that it competes more strongly with superconductivity. We also observed additional phonon modes in the t-AF phase which likely arise from a Brillouin-zone folding that is induced by the double-Q magnetic structure with two Fe sublattices exhibiting different magnitudes of the magnetic moment.

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Preferred citation

Mallett, B. P. P., Marsik, P., Yazdi-Rizi, M., Wolf, T., Böhmer, A. E., Hardy, F., Meingast, C., Munzar, D. & Bernhard, C. (2015). Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba1-x KxFe2As2. Physical Review Letters, 115(2), 027003-. https://doi.org/10.1103/PhysRevLett.115.027003

Journal title

Physical Review Letters

Volume

115

Issue

2

Publication date

08/07/2015

Pagination

027003

Publisher

American Physical Society (APS)

Publication status

Published

Online publication date

08/07/2015

ISSN

0031-9007

eISSN

1079-7114

Article number

027003

Language

en