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Polaronic effect in the x-ray absorption spectra of La1-xCaxMnO3 manganites

Journal Article · · Journal of Physics. Condensed Matter
 [1];  [2];  [3];  [4];  [4];  [5];  [6];  [2]
  1. Lund Univ., Lund (Sweden); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. National Chiao Tung Univ., Hsinchu (Taiwan)
  3. Lund Univ., Lund (Sweden); National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
  4. National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
X-ray absorption spectroscopy (XAS) is performed to study changes in the electronic structures of colossal magnetoresistance (CMR) and charged ordered (CO) La1–xCaxMnO3 manganites with respect to temperature. The pre-edge features in O and Mn K-edge XAS spectra, which are highly sensitive to the local distortion of MnO6 octahedral, exhibit contrasting temperature dependence between CMR and CO samples. The seemingly counter-intuitive XAS temperature dependence can be reconciled in the context of polarons. Furthermore these results help identify the most relevant orbital states associated with polarons and highlight the crucial role played by polarons in understanding the electronic structures of manganites.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1505421
Alternate ID(s):
OSTI ID: 1581602
OSTI ID: 23008970
Journal Information:
Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 19 Vol. 31; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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