- Physical Review Journals
All JournalsPhysics Magazine

Physical Review B

Export citation

Export citation

Choose format for download:

Download Citation
  • Letter

Phonon softening and slowing-down of charge density wave fluctuations in BaNi2As2

Yu Song1,2,*, Shan Wu3,4, Xiang Chen3,4, Yu He5,3,4, Hiroshi Uchiyama6, Baizhuo Li2, Saizheng Cao1, Jiayu Guo1, Guanghan Cao2 et al.

Robert Birgeneau3,4

  • 1Center for Correlated Matter and School of Physics, Zhejiang University, Hangzhou 310058, China
  • 2Zhejiang Province Key Laboratory of Quantum Technology and Device, School of Physics, Zhejiang University, Hangzhou 310058, China
  • 3Physics Department, University of California, Berkeley, California 94720, USA
  • 4Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA
  • 6Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan

  • *yusong_phys@zju.edu.cn
PDF

Phys. Rev. B 107, L041113 – Published 30 January, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L041113

Abstract

BaNi2As2 is a nonmagnetic analog of the iron pnictide superconductors, and exhibits an incommensurate charge density wave (IC-CDW) and a sizable elastoresistance. In this Letter, phonons in BaNi2As2 associated with the IC-CDW and uniform in-plane lattice distortions are investigated using high-resolution inelastic x-ray scattering. The in-plane transverse acoustic phonons reveal no softening at temperatures where the elastoresistance increases strongly, indicating the latter to be electronically driven. Systematic phonon measurements suggest the IC-CDW occurs in two stages upon cooling: Underdamped phonons first soften to zero energy well above the IC-CDW ordering temperature, then the resulting quasielastic IC-CDW fluctuations gradually slow down and coalesce into the static IC-CDW order. A possible origin for our observations is the IC-CDW in BaNi2As2 being uniaxial, which provides an additional Ising degree of freedom favorable for disordered IC-CDW modulations, and accounts for the elastoresistance through a weak coupling to the lattice.

View figure in article

Physics Subject Headings (PhySH)

Authorization Required

We need you to provide your credentials before accessing this content.
Article Available via CHORUS
Download Accepted Manuscript

Other Options

Supplemental Material (Subscription Required)

References (Subscription Required)

Outline

Information

Phys. Rev. B 107, L041113– Published 30 January, 2023
  • Received 10 July 2022
  • Revised 16 November 2022
  • Accepted 17 January 2023
Crossmark - Check for updates button

©2023 American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation