The phononic and charge density wave behavior of entire rare-earth tritelluride series with chemical pressure and temperature

Author:

Yumigeta Kentaro1,Attarde Yashika1,Kopaczek Jan1,Sayyad Mohammed Y.1,Shen Yuxia1,Blei Mark1,Rajaei Moosavy Seyed Tohid1,Qin Ying1,Sailus Renee1,Tongay Sefaattin1ORCID

Affiliation:

1. School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, USA

Abstract

Here, we present comprehensive phononic and charge density wave properties (CDW) of rare-earth van der Waals tritellurides through temperature dependent angle-resolved Raman spectroscopy measurements. All the possible rare-earth tritellurides (RTe3) ranging from R = La–Nd, Sm, Gd–Tm were synthesized through a chemical vapor transport technique to achieve high quality crystals with excellent CDW characteristics. Raman spectroscopy studies successfully identify the emergence of the CDW state and transition temperature (TCDW), which offers a non-destructive method to identify their CDW response with micron spatial resolution. Temperature dependent Raman measurements further correlate how the atomic mass of metal cations and the resulting chemical pressure influence its CDW properties and offer detailed insight into the strength of CDW amplitude mode-phonon coupling during the CDW transition. Angle-resolved Raman measurements offer the first insights into the CDW-phonon symmetry interplay by monitoring the change in the symmetry of phonon mode across the CDW transition. Overall results introduce the library of RTe3 CDW materials and establish their characteristics through the non-destructive angle-resolved Raman spectroscopy technique.

Funder

Applied Materials Inc.

U.S. Department of Energy

Division of Civil, Mechanical and Manufacturing Innovation

Division of Materials Research

Division of Biological Infrastructure

Division of Electrical, Communications and Cyber Systems

Publisher

AIP Publishing

Subject

General Engineering,General Materials Science

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