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Strain relaxation behaviour of vortices in a multiferroic superconductor

Evans, D M; Schiemer, J A; Wolf, T; Adelmann, P; Böhmer, A E; Meingast, C; Dutton, S E; Mukherjee, P; Hsu, Y-T; Carpenter, M A

The elastic and anelastic properties of a single crystal of Co-doped pnictide Ba(Fe0.957Co0.043)2As2 have been determined by resonant ultrasound spectroscopy in the frequency range 10–500 kHz, both as a function of temperature through the normalsuperconducting transition (Tc ≈ 12.5 K) and as a function of applied magnetic field up to 12.5 T. Correlation with thermal expansion, electrical resistivity, heat capacity, DC and AC magnetic data from crystals taken from the same synthetic batch has revealed the permeating influence of strain on coupling between order parameters for the ferroelastic (QE) and superconducting (QSC) transitions and on the freezing/relaxation behaviour of vortices. Elastic softening through Tc in zero field can be understood in terms of classical coupling of the order parameter with the shear strain e6, λe6Q2SC, which means that there must be a common strain mechanism for coupling of the form λQ2SCQE. At fields of ~5 T and above, this softening is masked by Debye-like stiffening and acoustic loss processes due to vortex freezing. The first loss peak may be associated with the establishment of superconductivity ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000091204
Veröffentlicht am 19.02.2019
DOI: 10.1088/1361-648X/aafbd7
Web of Science
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0953-8984, 1361-648X
KITopen-ID: 1000091204
HGF-Programm 43.21.01 (POF III, LK 01)
Erschienen in Journal of physics / Condensed matter
Band 31
Heft 13
Seiten Art. Nr.: 135403
Vorab online veröffentlicht am 06.02.2019
Schlagworte pnictide, vortices, strain coupling
Nachgewiesen in Web of Science
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