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Title: Acoustic phonon dispersion and diffuse scattering across the valence transition of ( P r 0.85 Y 0.15 ) 0.7 C a 0.3 Co O 3 - δ

Abstract

A number of praseodymium-containing cobalt perovskites undergo temperature-dependent metal-insulator transitions that involve a transfer of electrons between cobalt and praseodymium cations. We have used high- resolution inelastic x-ray scattering to directly measure the changes in the acoustic phonon dispersion through this transition in one such single crystal, (Pr 0.85Y 0.15)(0.)7Ca 0.3CoO 3-$$\delta$$, in an effort to understand the role of the lattice in the transition. Transverse and acoustic modes were measured in the pseudocubic (200), (220), and (222) zones both above and below the transition temperature. The resultant dispersion curves reveal that the transition is associated with a significant hardening of the pseudocubic C 11 elastic constant, whereas C 12 and C 44 do not significantly change. Here, analysis of the temperature-dependent damping of the longitudinal acoustic mode in the (200) zone reveals a peak in the damping at temperatures just above the transition temperature. Significant elastic diffuse scattering is also observed above the transition temperature, likely resulting from clusters in which the electron transfer is beginning to occur as a precursor to the phase transition. The presence of these clusters likely limits the phonon lifetimes, thus leading to the observed damping.

Authors:
 [1];  [1];  [2];  [1];  [3];  [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Cornell Univ., Ithaca, NY (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1557613
Alternate Identifier(s):
OSTI ID: 1546823
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 5; 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

Citation Formats

Phelan, D., Krogstad, M. J., Schreiber, N. J., Osborn, R., Said, A. H., Zheng, H., and Rosenkranz, S. Acoustic phonon dispersion and diffuse scattering across the valence transition of (Pr0.85Y0.15)0.7Ca0.3CoO3-δ. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.054101.
Phelan, D., Krogstad, M. J., Schreiber, N. J., Osborn, R., Said, A. H., Zheng, H., & Rosenkranz, S. Acoustic phonon dispersion and diffuse scattering across the valence transition of (Pr0.85Y0.15)0.7Ca0.3CoO3-δ. United States. doi:10.1103/PhysRevB.100.054101.
Phelan, D., Krogstad, M. J., Schreiber, N. J., Osborn, R., Said, A. H., Zheng, H., and Rosenkranz, S. Fri . "Acoustic phonon dispersion and diffuse scattering across the valence transition of (Pr0.85Y0.15)0.7Ca0.3CoO3-δ". United States. doi:10.1103/PhysRevB.100.054101.
@article{osti_1557613,
title = {Acoustic phonon dispersion and diffuse scattering across the valence transition of (Pr0.85Y0.15)0.7Ca0.3CoO3-δ},
author = {Phelan, D. and Krogstad, M. J. and Schreiber, N. J. and Osborn, R. and Said, A. H. and Zheng, H. and Rosenkranz, S.},
abstractNote = {A number of praseodymium-containing cobalt perovskites undergo temperature-dependent metal-insulator transitions that involve a transfer of electrons between cobalt and praseodymium cations. We have used high- resolution inelastic x-ray scattering to directly measure the changes in the acoustic phonon dispersion through this transition in one such single crystal, (Pr0.85Y0.15)(0.)7Ca0.3CoO3-$\delta$, in an effort to understand the role of the lattice in the transition. Transverse and acoustic modes were measured in the pseudocubic (200), (220), and (222) zones both above and below the transition temperature. The resultant dispersion curves reveal that the transition is associated with a significant hardening of the pseudocubic C11 elastic constant, whereas C12 and C44 do not significantly change. Here, analysis of the temperature-dependent damping of the longitudinal acoustic mode in the (200) zone reveals a peak in the damping at temperatures just above the transition temperature. Significant elastic diffuse scattering is also observed above the transition temperature, likely resulting from clusters in which the electron transfer is beginning to occur as a precursor to the phase transition. The presence of these clusters likely limits the phonon lifetimes, thus leading to the observed damping.},
doi = {10.1103/PhysRevB.100.054101},
journal = {Physical Review B},
number = 5,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}

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