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DOI: 10.5445/IR/1000092129
Veröffentlicht am 13.03.2019
DOI: 10.1088/1361-648X/aafe29
Zitationen: 1
Web of Science
Zitationen: 1

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 ... mehr

Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0953-8984, 1361-648X
URN: urn:nbn:de:swb:90-921296
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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