I-centered vs F-centered orthorhombic symmetry and negative thermal expansion of the charge density wave of EuAl₂Ga₂

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00009184
URN to cite this document: urn:nbn:de:bvb:703-epub-9184-6

Title data

Agarwal, Harshit ; Kotla, Surya Rohith ; Noohinejad, Leila ; Bag, Biplab ; Eisele, Claudio ; Ramakrishnan, Sitaram ; Tolkiehn, Martin ; Paulmann, Carsten ; Thamizhavel, Arumugam ; Ramakrishnan, Srinivasan ; van Smaalen, Sander:
I-centered vs F-centered orthorhombic symmetry and negative thermal expansion of the charge density wave of EuAl₂Ga₂.
In: Physical Review B. Vol. 111 (2025) . - 155144.
ISSN 2469-9969
DOI der Verlagsversion: https://doi.org/10.1103/PhysRevB.111.155144

	Format: PDF Name: PhysRevB.111.155144.pdf Version: Published Version Available under License Creative Commons BY 4.0: Attribution
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Abstract

Together with EuGa4 and EuAl4, EuAl2Ga2 belongs to the BaAl4 structure type with space group symmetry I4/mmm. EuAl2Ga2 develops an incommensurate charge density wave (CDW) at temperatures below TCDW = 51 K. On the basis of temperature dependent single-crystal X-ray diffraction (SXRD) data, the incommensurately modulated CDW crystal structure of EuAl2Ga2 is determined to possess orthorhombic superspace symmetry Immm(00g)s00. This symmetry is different from the orthorhombic Fmmm based symmetry of the CDW state of EuAl4. Nevertheless, both symmetries Immm(00g)s00 and Fmmm(00g)s00 lead to the same conclusion, that the CDW is supported by the layers of Al1 type atoms, while the Eu and Al2 or Ga atoms are not directly involved in CDW formation. The different symmetries of the CDW states of EuAl4 and EuAl2Ga2, as well as the observation of negative thermal expansion in the CDW state of EuAl2Ga2 might be explained by the effects of Ga substitution in the latter compound.

Further data

Item Type:	Article in a journal
DDC Subjects:	500 Science > 530 Physics
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 > Department of Physics > Former Professors > 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 > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-9184-6
Date Deposited:	11 May 2026 12:46
Last Modified:	11 May 2026 12:47
URI:	https://epub.uni-bayreuth.de/id/eprint/9184

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