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Title: Quasi-two-dimensional spin and phonon excitations in La 1.965Ba 0.035CuO 4

Abstract

Here, we present time-of-fight inelastic neutron scattering measurements of La 1.965Ba 0.035CuO 4 (LBCO), a lightly doped member of the high temperature superconducting La-based cuprate family. By using time-of-flight neutron instrumentation coupled with single crystal sample rotation we obtain a four-dimensional data set (three Q and one energy) that is both comprehensive and spans a large region of reciprocal space. Our measurements identify rich structure in the energy dependence of the highly dispersive spin excitations, which are centered at equivalent (1/2, 1/2, L) wave-vectors. These structures correlate strongly with several crossings of the spin excitations with the lightly dispersive phonons found in this system. These eects are signicant and account for on the order of 25% of the total inelastic scattering for energies between ≈5 and 40meV at low |Q|. Interestingly, this scattering also presents little or no L-dependence. As the phonons and dispersive spin excitations centred at equivalent (1/2, 1/2, L) wave-vectors are common to all members of La-based 214 copper oxides, we conclude such strong quasi-two dimensional scattering enhancements are likely to occur in all such 214 families of materials, including those concentrations corresponding to superconducting ground states. Such a phenomenon appears to be a fundamental characteristic ofmore » these materials and is potentially related to superconducting pairing.« less

Authors:
 [1];  [2];  [3];  [3];  [4];  [1];  [5]
  1. McMaster Univ., Hamilton, ON (Canada)
  2. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. National Institute of Standards and Technology, Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  5. McMaster Univ., Hamilton, ON (Canada); Canadian Institute for Advanced Research, Toronto, ON (Canada)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1207050
Alternate Identifier(s):
OSTI ID: 1183784
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 22; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Wagman, J. J., Parshall, D., Stone, Matthew B., Savici, Andrei T., Zhao, Yang, Dabkowska, H. A., and Gaulin, B. D. Quasi-two-dimensional spin and phonon excitations in La1.965Ba0.035CuO4. United States: N. p., 2015. Web. doi:10.1103/PhysRevB.91.224404.
Wagman, J. J., Parshall, D., Stone, Matthew B., Savici, Andrei T., Zhao, Yang, Dabkowska, H. A., & Gaulin, B. D. Quasi-two-dimensional spin and phonon excitations in La1.965Ba0.035CuO4. United States. doi:10.1103/PhysRevB.91.224404.
Wagman, J. J., Parshall, D., Stone, Matthew B., Savici, Andrei T., Zhao, Yang, Dabkowska, H. A., and Gaulin, B. D. Wed . "Quasi-two-dimensional spin and phonon excitations in La1.965Ba0.035CuO4". United States. doi:10.1103/PhysRevB.91.224404. https://www.osti.gov/servlets/purl/1207050.
@article{osti_1207050,
title = {Quasi-two-dimensional spin and phonon excitations in La1.965Ba0.035CuO4},
author = {Wagman, J. J. and Parshall, D. and Stone, Matthew B. and Savici, Andrei T. and Zhao, Yang and Dabkowska, H. A. and Gaulin, B. D.},
abstractNote = {Here, we present time-of-fight inelastic neutron scattering measurements of La1.965Ba0.035CuO4 (LBCO), a lightly doped member of the high temperature superconducting La-based cuprate family. By using time-of-flight neutron instrumentation coupled with single crystal sample rotation we obtain a four-dimensional data set (three Q and one energy) that is both comprehensive and spans a large region of reciprocal space. Our measurements identify rich structure in the energy dependence of the highly dispersive spin excitations, which are centered at equivalent (1/2, 1/2, L) wave-vectors. These structures correlate strongly with several crossings of the spin excitations with the lightly dispersive phonons found in this system. These eects are signicant and account for on the order of 25% of the total inelastic scattering for energies between ≈5 and 40meV at low |Q|. Interestingly, this scattering also presents little or no L-dependence. As the phonons and dispersive spin excitations centred at equivalent (1/2, 1/2, L) wave-vectors are common to all members of La-based 214 copper oxides, we conclude such strong quasi-two dimensional scattering enhancements are likely to occur in all such 214 families of materials, including those concentrations corresponding to superconducting ground states. Such a phenomenon appears to be a fundamental characteristic of these materials and is potentially related to superconducting pairing.},
doi = {10.1103/PhysRevB.91.224404},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 22,
volume = 91,
place = {United States},
year = {2015},
month = {6}
}

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