Spin wave damping arising from phase coexistence below Tc in colossal magnetoresistive La0.7Ca0.3MnO3

Helton, Joel S.; Jones, Susumu K.; Parshall, Daniel; Stone, Matthew B.; Shulyatev, Dmitry A.; Lynn, Jeffrey W.

doi:10.1103/PhysRevB.96.104417

Title: Spin wave damping arising from phase coexistence below $T_{c}$ in colossal magnetoresistive ${La}_{0.7} {Ca}_{0.3} {MnO}_{3}$

Journal Article · Wed Sep 13 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.104417· OSTI ID:1471944

Helton, Joel S. ^[1]; Jones, Susumu K. ^[2]; Parshall, Daniel ^[3];

^[4]; Shulyatev, Dmitry A. ^[5]; Lynn, Jeffrey W. ^[3]

United States Naval Academy, Annapolis, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
United States Naval Academy, Annapolis, MD (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Univ. of Science and Technology "MISiS", Moscow (Russia)

While the spin dynamics of La_0.7Ca_0.3MnO₃ 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 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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1471944

Alternate ID(s):: OSTI ID: 1389896

Journal Information:: Physical Review B, Vol. 96, Issue 10; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Title: Spin wave damping arising from phase coexistence below $T_{c}$ in colossal magnetoresistive ${La}_{0.7} {Ca}_{0.3} {MnO}_{3}$