Article (Scientific journals)
Anisotropic lattice dynamics and intermediate-phase magnetism in delafossite CuFeO2
Klobes, B.; Herlitschke, Marcus; Rushchanskii, K. Z. et al.
2015In Physical Review. B, Condensed Matter and Materials Physics, 92 (1)
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Abstract :
[en] Hyperfine interactions and Fe-specific lattice dynamics in CuFeO2 were investigated by nuclear resonance scattering methods and compared to ab initio lattice dynamics calculations. Using nuclear forward scattering the collinear spin structure at temperatures below about 11 K could be confirmed, whereas the nuclear forward scattering results in the intermediate temperature range between about 11 K and 14 K are incompatible with the assumption of a sinusoidal distribution of spins parallel to the c axis of CuFeO2. The critical behavior of the average hyperfine field at the phase transition at about 14 K further supports a three-dimensional model for the magnetism in this compound. Moreover, using nuclear inelastic scattering by the 57Fe Mössbauer resonance, Fe-specific lattice dynamics are found to be strongly anisotropic with stiffer bonds in the ab plane of the crystal. The powder averaged, Fe partial density of phonon states can be well modeled using ab initio calculations and low-energy phonons are found to deviate from classical Debye-like behavior, indicating spin-phonon coupling in this compound. Besides, the theoretical phonon spectrum exhibits typical characteristics for delafossite-type material. © 2015 American Physical Society. ©2015 American Physical Society.
Disciplines :
Chemistry
Author, co-author :
Klobes, B.;  Jülich Centre for Neutron Science JCNS, Peter Grünberg Institute PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany
Herlitschke, Marcus ;  FS-PE, Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany
Rushchanskii, K. Z.;  Peter Grünberg Institut, Quanten-Theorie der Materialien, Forschungszentrum Jülich and JARA, Jülich, Germany
Wille, H.-C.;  FS-PE, Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany
Lummen, T. T. A.;  Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, AG Groningen, Netherlands
Van Loosdrecht, P. H. M.;  Jülich Centre for Neutron Science JCNS, Peter Grünberg Institute PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany
Nugroho, A. A.;  Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, Indonesia
Hermann, Raphaël ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
Anisotropic lattice dynamics and intermediate-phase magnetism in delafossite CuFeO2
Publication date :
2015
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
American Physical Society
Volume :
92
Issue :
1
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 November 2020

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