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Title: Coherent order parameter dynamics in SmTe 3

Abstract

We present ultrafast optical pump-probe and ultrafast x-ray diffraction measurements of the charge density wave dynamics in SmTe3 at 300 K. We performed ultrafast x-ray diffraction measurements at the Linac Coherent Light Source to directly probe the dynamics of the finite-wave-vector order parameter. The dynamics reveal coherent oscillations at ~1.6 THz that become overdamped with increasing fluence. We identify this oscillation with the lattice component of the amplitude mode. Furthermore, our data allow for a clear identification of the amplitude mode frequency in the optical pump-probe data. In both measurements, the system reaches the symmetric phase at high fluence, where the order parameter vanishes and the response (reflectivity and x-ray intensity) is quadratic in the order parameter. This is observed in the x-ray diffraction as a small overdamped modulation near zero intensity. Similar overdamped features are observed in the optical reflectivity at high fluence. In conclusion, a time-dependent Ginzburg-Landau model captures qualitatively the essential features of the experimental observations.

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [3];  [4];  [1];  [4];  [4];  [4]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); Univ. de Los Andes, Bogota (Colombia)
  3. Japan Synchrotron Radiation Research Institute, Hyogo (Japan)
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1526471
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Trigo, M., Giraldo-Gallo, P., Kozina, M. E., Henighan, T., Jiang, M. P., Liu, H., Clark, J. N., Chollet, M., Glownia, J. M., Zhu, D., Katayama, T., Leuenberger, D., Kirchmann, P. S., Fisher, I. R., Shen, Z. X., and Reis, D. A. Coherent order parameter dynamics in SmTe3. United States: N. p., 2019. Web. doi:10.1103/physrevb.99.104111.
Trigo, M., Giraldo-Gallo, P., Kozina, M. E., Henighan, T., Jiang, M. P., Liu, H., Clark, J. N., Chollet, M., Glownia, J. M., Zhu, D., Katayama, T., Leuenberger, D., Kirchmann, P. S., Fisher, I. R., Shen, Z. X., & Reis, D. A. Coherent order parameter dynamics in SmTe3. United States. doi:10.1103/physrevb.99.104111.
Trigo, M., Giraldo-Gallo, P., Kozina, M. E., Henighan, T., Jiang, M. P., Liu, H., Clark, J. N., Chollet, M., Glownia, J. M., Zhu, D., Katayama, T., Leuenberger, D., Kirchmann, P. S., Fisher, I. R., Shen, Z. X., and Reis, D. A. Thu . "Coherent order parameter dynamics in SmTe3". United States. doi:10.1103/physrevb.99.104111.
@article{osti_1526471,
title = {Coherent order parameter dynamics in SmTe3},
author = {Trigo, M. and Giraldo-Gallo, P. and Kozina, M. E. and Henighan, T. and Jiang, M. P. and Liu, H. and Clark, J. N. and Chollet, M. and Glownia, J. M. and Zhu, D. and Katayama, T. and Leuenberger, D. and Kirchmann, P. S. and Fisher, I. R. and Shen, Z. X. and Reis, D. A.},
abstractNote = {We present ultrafast optical pump-probe and ultrafast x-ray diffraction measurements of the charge density wave dynamics in SmTe3 at 300 K. We performed ultrafast x-ray diffraction measurements at the Linac Coherent Light Source to directly probe the dynamics of the finite-wave-vector order parameter. The dynamics reveal coherent oscillations at ~1.6 THz that become overdamped with increasing fluence. We identify this oscillation with the lattice component of the amplitude mode. Furthermore, our data allow for a clear identification of the amplitude mode frequency in the optical pump-probe data. In both measurements, the system reaches the symmetric phase at high fluence, where the order parameter vanishes and the response (reflectivity and x-ray intensity) is quadratic in the order parameter. This is observed in the x-ray diffraction as a small overdamped modulation near zero intensity. Similar overdamped features are observed in the optical reflectivity at high fluence. In conclusion, a time-dependent Ginzburg-Landau model captures qualitatively the essential features of the experimental observations.},
doi = {10.1103/physrevb.99.104111},
journal = {Physical Review B},
number = 10,
volume = 99,
place = {United States},
year = {2019},
month = {3}
}

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