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Coexistence of charge density wave and antiferromagnetism in Er5Ir4Si10

Title data

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. Vol. 14 (2002) Issue 20 . - pp. 5067-5075.
ISSN 1361-648X
DOI: https://doi.org/10.1088/0953-8984/14/20/302

Official URL: Volltext

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 21 Mar 2016 10:39
Last Modified: 26 Nov 2019 10:30
URI: https://eref.uni-bayreuth.de/id/eprint/31926