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Polaronic correlations and phonon renormalization in La1–xSrxMnO3(x = 0.2, 0.3)

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [3];  [4]
  1. Karlsruhe Inst. of Technology (KIT) (Germany); Delft Univ. of Technology (Netherlands); University of Colorado Boulder, Dept. of Physics
  2. Karlsruhe Inst. of Technology (KIT) (Germany); Laboratoire Léon Brillouin (CEA-CNRS), Gif-sur-Yvette (France)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. Karlsruhe Inst. of Technology (KIT) (Germany)
According to standard theory the magnetoresistance magnitude in ferromagnetic manganites crucially depends on the electron-phonon coupling strength. We showed that in La0.7Sr0.3MnO3 the phonon renormalization is strong, despite its relatively small magnetoresistance. Here, we report results of a similar inelastic neutron-scattering investigation of a closely related compound, La0.8Sr0.2MnO3, where the magnetoresistance is enhanced. We find similar phonon renormalization and dynamic CE-type polaron correlations as in La0.7Sr0.3MnO3. Furthermore, quantitative comparison of the results for the two samples shows that only polaron lifetime is well correlated with the strength of the colossal magnetoresistance.
Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0006939
OSTI ID:
1842510
Alternate ID(s):
OSTI ID: 1540885
OSTI ID: 1457075
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 24 Vol. 97; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (29)

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Polaronic metal phases in L a 0.7 S r 0.3 Mn O 3 uncovered by inelastic neutron and x-ray scattering journal January 2016
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Ferromagnetism and electron-phonon coupling in the manganites text January 2002

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