Reconciliation of local and long-range tilt correlations in underdoped La2-xBaxCuO4(0 ≤ x ≤ 0.155)
Abstract
In this study, a long standing puzzle regarding the disparity of local and long range CuO₆ octahedral tilt correlations in the underdoped regime of La2-xBaxCuO₄ is addressed by utilizing complementary neutron powder diffraction and inelastic neutron scattering (INS) approaches. Long-range and static CuO₆ tilt order with orthogonally inequivalent Cu-O bonds in the CuO₂ planes in the low temperature tetragonal (LTT) phase is succeeded on warming through the low-temperature transition by one with orthogonally equivalent bonds in the low temperature orthorhombic (LTO) phase. In contrast, the signatures of LTT-type tilts in the instantaneous local atomic structure persist on heating throughout the LTO crystallographic phase on the nanoscale, although becoming weaker as temperature increases. Analysis of the INS spectra for the x = 1/8 composition reveals the dynamic nature of the LTT-like tilt fluctuations within the LTO phase and their 3D character. The doping dependence of relevant structural parameters indicates that the magnitude of the Cu-O bond anisotropy has a maximum at x = 1/8 doping were bulk superconductivity is most strongly suppressed, suggesting that the structural anisotropy might be influenced by electron-phonon coupling and the particular stability of the stripe-ordered phase at this composition. The bond-length modulation that pins stripe ordermore »
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States); Columbia Univ., New York, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1182483
- Alternate Identifier(s):
- OSTI ID: 1179936; OSTI ID: 1188211
- Report Number(s):
- BNL-107315-2014-JA; BNL-107646-2015-JA
Journal ID: ISSN 1098-0121; PRBMDO; R&D Project: PM032; KC0202010
- Grant/Contract Number:
- SC00112704; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 5; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Bozin, Emil S., Zhong, Ruidan, Knox, Kevin R., Gu, Genda, Hill, John P., Tranquada, John M., and Billinge, Simon J. L. Reconciliation of local and long-range tilt correlations in underdoped La2-xBaxCuO4(0 ≤ x ≤ 0.155). United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.91.054521.
Bozin, Emil S., Zhong, Ruidan, Knox, Kevin R., Gu, Genda, Hill, John P., Tranquada, John M., & Billinge, Simon J. L. Reconciliation of local and long-range tilt correlations in underdoped La2-xBaxCuO4(0 ≤ x ≤ 0.155). United States. https://doi.org/10.1103/PhysRevB.91.054521
Bozin, Emil S., Zhong, Ruidan, Knox, Kevin R., Gu, Genda, Hill, John P., Tranquada, John M., and Billinge, Simon J. L. Thu .
"Reconciliation of local and long-range tilt correlations in underdoped La2-xBaxCuO4(0 ≤ x ≤ 0.155)". United States. https://doi.org/10.1103/PhysRevB.91.054521. https://www.osti.gov/servlets/purl/1182483.
@article{osti_1182483,
title = {Reconciliation of local and long-range tilt correlations in underdoped La2-xBaxCuO4(0 ≤ x ≤ 0.155)},
author = {Bozin, Emil S. and Zhong, Ruidan and Knox, Kevin R. and Gu, Genda and Hill, John P. and Tranquada, John M. and Billinge, Simon J. L.},
abstractNote = {In this study, a long standing puzzle regarding the disparity of local and long range CuO₆ octahedral tilt correlations in the underdoped regime of La2-xBaxCuO₄ is addressed by utilizing complementary neutron powder diffraction and inelastic neutron scattering (INS) approaches. Long-range and static CuO₆ tilt order with orthogonally inequivalent Cu-O bonds in the CuO₂ planes in the low temperature tetragonal (LTT) phase is succeeded on warming through the low-temperature transition by one with orthogonally equivalent bonds in the low temperature orthorhombic (LTO) phase. In contrast, the signatures of LTT-type tilts in the instantaneous local atomic structure persist on heating throughout the LTO crystallographic phase on the nanoscale, although becoming weaker as temperature increases. Analysis of the INS spectra for the x = 1/8 composition reveals the dynamic nature of the LTT-like tilt fluctuations within the LTO phase and their 3D character. The doping dependence of relevant structural parameters indicates that the magnitude of the Cu-O bond anisotropy has a maximum at x = 1/8 doping were bulk superconductivity is most strongly suppressed, suggesting that the structural anisotropy might be influenced by electron-phonon coupling and the particular stability of the stripe-ordered phase at this composition. The bond-length modulation that pins stripe order is found to be remarkably subtle, with no anomalous bond length disorder at low temperature, placing an upper limit on any in-plane Cu-O bondlength anisotropy. The results further reveal that although appreciable octahedral tilts persist through the high-temperature transition and into the high temperature tetragonal (HTT) phase, there is no significant preference between different tilt directions in the HTT regime. This study also exemplifies the importance of a systematic approach using complementary techniques when investigating systems exhibiting a large degree of complexity and subtle structural responses.},
doi = {10.1103/PhysRevB.91.054521},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 5,
volume = 91,
place = {United States},
year = {Thu Feb 26 00:00:00 EST 2015},
month = {Thu Feb 26 00:00:00 EST 2015}
}
Web of Science
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