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Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe0.957Co0.043)₂As₂

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

The hypothesis that strain has a permeating influence on ferroelastic, magnetic and superconducting transitions in 122 iron pnictides has been tested by investigating variations of the elastic and anelastic properties of a single crystal of Ba(Fe0.957Co0.043)2As2 by resonant ultrasound spectroscopy as a function of temperature and externally applied magnetic field. Non-linear softening and stiffening of C 66 in the stability fields of both the tetragonal and orthorhombic structures has been found to conform quantitatively to the Landau expansion for a pseudoproper ferroelastic transition which is second order in character. The only exception is that the transition occurs at a temperature (T S  ≈  69 K) ~10 K above the temperature at which C 66 would extrapolate to zero (  ≈  59 K). An absence of anomalies associated with antiferromagnetic ordering below T N  ≈  60 K implies that coupling of the magnetic order parameter with shear strain is weak. It is concluded that linear-quadratic coupling between the structural/electronic and antiferromagnetic order parameters is suppressed due to the effects of local heterogeneous strain fields arising from the substitution of Fe by Co. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000092129
Veröffentlicht am 13.03.2019
DOI: 10.1088/1361-648X/aafe29
Zitationen: 1
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: 1000092129
HGF-Programm 43.21.01 (POF III, LK 01)
Erschienen in Journal of physics / Condensed matter
Band 31
Heft 15
Seiten 155401
Vorab online veröffentlicht am 15.02.2019
Nachgewiesen in Scopus
Web of Science
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