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Coexistence of charge density wave and antiferromagnetism in Er5Ir4Si10

Titelangaben

Galli, Federica ; Feyerherm, R. ; Hendrikx, R. W. A. ; Dudzik, E. ; Nieuwenhuys, Gerard J. ; Ramakrishnan, S. ; Brown, S. D. ; van Smaalen, Sander ; Mydosh, J. A.:
Coexistence of charge density wave and antiferromagnetism in Er5Ir4Si10.
In: Journal of Physics: Condensed Matter. Bd. 14 (2002) Heft 20 . - S. 5067-5075.
ISSN 0953-8984
DOI: https://doi.org/10.1088/0953-8984/14/20/302

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Abstract

Er 5 Ir 4 Si 10 exhibits three phase transitions upon cooling below room temperature. At T CDW = 151 K a combined commensurate and incommensurate superstructure develops, that has been attributed to the formation of charge density waves (CDWs). At T LI = 60 K (LI = lock-in) the superstructure becomes commensurate, and at T N = 2.8 K a state with long-range antiferromagnetic order develops. In this contribution we report the results of high-intensity, high-resolution x-ray diffraction for the temperature region encompassing all four phases. We have found that above T CDW the critical scattering of the commensurate superlattice reflections persists up to much higher temperatures than the critical scattering of the incommensurate satellites. It is argued that this finding substantiates the hypothesis in which the mechanism of the CDW transition involves a structural transition towards a twofold superstructure. The superlattice reflections are found to be broader in the lock-in phase than above T LI . This suggests that the lock-in transition results in relatively small domains, that are responsible for the broadening of the reflections. Finally, the antiferromagnetic order is observed by resonant x-ray scattering. The commensurate superlattice reflections persist down to 1.87 K, and no effect of the magnetic transition on their positions or intensities is found. Thus the magnetic order and the CDW coexist below T N in this compound.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie > Lehrstuhl Kristallographie - Univ.-Prof. Dr. Sander van Smaalen
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 21 Mär 2016 10:39
Letzte Änderung: 21 Mär 2016 10:39
URI: https://eref.uni-bayreuth.de/id/eprint/31926