15-18 March 2021
DESY
Europe/Berlin timezone

Charge density wave order in Pr2Ru3Ge5

16 Mar 2021, 11:15
20m
https://desy.zoom.us/j/99208594918

https://desy.zoom.us/j/99208594918

Oral contribution Inorganic crystal structures Inorganic crystal structures

Speaker

Jin-Ke Bao (University of Bayreuth)

Description

The charge density wave (CDW) is a collective phenomenon where electrons at the Fermi level form a density wave with an additional periodicity as compared to the atomic lattice. RE$_2$Ru$_3$Ge$_5$ (RE = Pr, Sm, Dy) crystallize in the Sc$_2$Fe$_3$Si$_5$-type structure (space group $P$4/$nmc$). They show peculiar CDW-induced lattice modulations in a certain temperature range below which those modulations disappear.[1] Compared to Sm$_2$Ru$_3$Ge$_5$, Pr$_2$Ru$_3$Ge$_5$ has a higher transition temperature and no detailed structure refinements have been reported for the modulated phase for this compound. In this presentation, we will show that Pr$_2$Ru$_3$Ge$_5$ exhibits phase transitions at around 200 K from specific heat and transport property measurements. Satellite peaks have been observed in x-ray diffraction with a modulation wave vector q = (0.18,$\pm$0.18, 0). Unanticipatedly, satellite peaks disappear below 180 K. The modulated crystal structure of the CDW phase of Pr$_2$Ru$_3$Ge$_5$ will be presented on the basis of the superspace method.
[1] Bugaris, D. E et al. Charge Density Wave in the New Polymorphs of RE$_2$Ru$_3$Ge$_5$ (RE = Pr, Sm, Dy). J. Am. Chem. Soc. 2017, 139 (11), 4130-4143.

Primary authors

Jin-Ke Bao (University of Bayreuth) Dr Yupeng Li (Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University) Dr Sitaram Ramakrishnan (Laboratory of Crystallography, University of Bayreuth) Mr Surya Rohith Kotla (Laboratory of Crystallography, University of Bayreuth) Mr Claudio Eisele (Laboratory of Crystallography, University of Bayreuth) Dr Duck Young Chung (Materials Science Division, Argonne National Laboratory) Dr Carsten Paulmann (DESY) Dr Leila Noohinejad (DESY) Dr Martin Tolkiehn (DESY) Prof. Zhu-An Xu (Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University) Prof. Mercouri Kanatzidis (Northwestern University) Sander van Smaalen (University of Bayreuth)

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