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Title: Spin wave damping arising from phase coexistence below T c in colossal magnetoresistive La 0.7 Ca 0.3 MnO 3

Abstract

While the spin dynamics of La 0.7Ca 0.3MnO 3 in the ferromagnetic phase are known to be unconventional, previous measurements have yielded contradictory results regarding the damping of spin wave excitations. Neutron spectroscopy measurements on a sample with a transition temperature of T c = 257 K, higher than most single crystals, unambiguously reveal an anomalous increase in spin wave damping for excitations approaching the Brillouin zone boundary along the [100] direction that cannot be explained as an artifact due to a noninteracting phonon branch. Spin waves throughout the ( HK0) plane display a common trend where the spin wave damping is dependent upon the excitation energy, increasing for energies above roughly 15 meV and reaching a full width at half maximum of at least 20 meV. In conclusion, the results are consistent with a model of intrinsic spatial inhomogeneity with phase separated regions approximately 18 Å in size persisting over a large range of temperatures below T c.

Authors:
 [1];  [2];  [3]; ORCiD logo [4];  [5];  [3]
  1. United States Naval Academy, Annapolis, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  2. United States Naval Academy, Annapolis, MD (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. National Univ. of Science and Technology "MISiS", Moscow (Russia)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1471944
Alternate Identifier(s):
OSTI ID: 1389896
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; 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

Citation Formats

Helton, Joel S., Jones, Susumu K., Parshall, Daniel, Stone, Matthew B., Shulyatev, Dmitry A., and Lynn, Jeffrey W. Spin wave damping arising from phase coexistence below Tc in colossal magnetoresistive La0.7Ca0.3MnO3. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.104417.
Helton, Joel S., Jones, Susumu K., Parshall, Daniel, Stone, Matthew B., Shulyatev, Dmitry A., & Lynn, Jeffrey W. Spin wave damping arising from phase coexistence below Tc in colossal magnetoresistive La0.7Ca0.3MnO3. United States. doi:10.1103/PhysRevB.96.104417.
Helton, Joel S., Jones, Susumu K., Parshall, Daniel, Stone, Matthew B., Shulyatev, Dmitry A., and Lynn, Jeffrey W. Wed . "Spin wave damping arising from phase coexistence below Tc in colossal magnetoresistive La0.7Ca0.3MnO3". United States. doi:10.1103/PhysRevB.96.104417. https://www.osti.gov/servlets/purl/1471944.
@article{osti_1471944,
title = {Spin wave damping arising from phase coexistence below Tc in colossal magnetoresistive La0.7Ca0.3MnO3},
author = {Helton, Joel S. and Jones, Susumu K. and Parshall, Daniel and Stone, Matthew B. and Shulyatev, Dmitry A. and Lynn, Jeffrey W.},
abstractNote = {While the spin dynamics of La0.7Ca0.3MnO3 in the ferromagnetic phase are known to be unconventional, previous measurements have yielded contradictory results regarding the damping of spin wave excitations. Neutron spectroscopy measurements on a sample with a transition temperature of Tc = 257 K, higher than most single crystals, unambiguously reveal an anomalous increase in spin wave damping for excitations approaching the Brillouin zone boundary along the [100] direction that cannot be explained as an artifact due to a noninteracting phonon branch. Spin waves throughout the (HK0) plane display a common trend where the spin wave damping is dependent upon the excitation energy, increasing for energies above roughly 15 meV and reaching a full width at half maximum of at least 20 meV. In conclusion, the results are consistent with a model of intrinsic spatial inhomogeneity with phase separated regions approximately 18 Å in size persisting over a large range of temperatures below Tc.},
doi = {10.1103/PhysRevB.96.104417},
journal = {Physical Review B},
number = 10,
volume = 96,
place = {United States},
year = {Wed Sep 13 00:00:00 EDT 2017},
month = {Wed Sep 13 00:00:00 EDT 2017}
}

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Works referenced in this record:

Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides
journal, September 1976