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Title: Magnetic-Field Tuning of Light-Induced Superconductivity in Striped La 2 x Ba x CuO 4 [Magnetic-Field Tuning of Photo-Induced Superconductivity in Striped La 2 x Ba x CuO 4 ]

Abstract

Optical excitation of stripe-ordered La2–xBaxCuO4 has been shown to transiently enhance superconducting tunneling between the CuO2 planes. This effect was revealed by a blueshift, or by the appearance of a Josephson plasma resonance in the terahertz-frequency optical properties. Here, we show that this photoinduced state can be strengthened by the application of high external magnetic fields oriented along the c axis. For a 7 T field, we observe up to a tenfold enhancement in the transient interlayer phase correlation length, accompanied by a twofold increase in the relaxation time of the photoinduced state. These observations are highly surprising, since static magnetic fields suppress interlayer Josephson tunneling and stabilize stripe order at equilibrium. We interpret our data as an indication that optically enhanced interlayer coupling in La2–xBaxCuO4 does not originate from a simple optical melting of stripes, as previously hypothesized. Furthermore, we speculate that the photoinduced state may emerge from activated tunneling between optically excited stripes in adjacent planes.

Authors:
 [1];  [1];  [1];  [1];  [1]; ORCiD logo [2];  [3]
  1. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany); Univ. of Oxford, Oxford (United Kingdom)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1492955
Alternate Identifier(s):
OSTI ID: 1488981
Report Number(s):
BNL-211231-2019-JAAM
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:  
SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 26; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Nicoletti, Daniele, Fu, D., Mehio, O., Moore, S., Disa, A. S., Gu, G. D., and Cavalleri, A. Magnetic-Field Tuning of Light-Induced Superconductivity in Striped La2–xBaxCuO4 [Magnetic-Field Tuning of Photo-Induced Superconductivity in Striped La2–xBaxCuO4]. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.267003.
Nicoletti, Daniele, Fu, D., Mehio, O., Moore, S., Disa, A. S., Gu, G. D., & Cavalleri, A. Magnetic-Field Tuning of Light-Induced Superconductivity in Striped La2–xBaxCuO4 [Magnetic-Field Tuning of Photo-Induced Superconductivity in Striped La2–xBaxCuO4]. United States. https://doi.org/10.1103/PhysRevLett.121.267003
Nicoletti, Daniele, Fu, D., Mehio, O., Moore, S., Disa, A. S., Gu, G. D., and Cavalleri, A. 2018. "Magnetic-Field Tuning of Light-Induced Superconductivity in Striped La2–xBaxCuO4 [Magnetic-Field Tuning of Photo-Induced Superconductivity in Striped La2–xBaxCuO4]". United States. https://doi.org/10.1103/PhysRevLett.121.267003. https://www.osti.gov/servlets/purl/1492955.
@article{osti_1492955,
title = {Magnetic-Field Tuning of Light-Induced Superconductivity in Striped La2–xBaxCuO4 [Magnetic-Field Tuning of Photo-Induced Superconductivity in Striped La2–xBaxCuO4]},
author = {Nicoletti, Daniele and Fu, D. and Mehio, O. and Moore, S. and Disa, A. S. and Gu, G. D. and Cavalleri, A.},
abstractNote = {Optical excitation of stripe-ordered La2–xBaxCuO4 has been shown to transiently enhance superconducting tunneling between the CuO2 planes. This effect was revealed by a blueshift, or by the appearance of a Josephson plasma resonance in the terahertz-frequency optical properties. Here, we show that this photoinduced state can be strengthened by the application of high external magnetic fields oriented along the c axis. For a 7 T field, we observe up to a tenfold enhancement in the transient interlayer phase correlation length, accompanied by a twofold increase in the relaxation time of the photoinduced state. These observations are highly surprising, since static magnetic fields suppress interlayer Josephson tunneling and stabilize stripe order at equilibrium. We interpret our data as an indication that optically enhanced interlayer coupling in La2–xBaxCuO4 does not originate from a simple optical melting of stripes, as previously hypothesized. Furthermore, we speculate that the photoinduced state may emerge from activated tunneling between optically excited stripes in adjacent planes.},
doi = {10.1103/PhysRevLett.121.267003},
url = {https://www.osti.gov/biblio/1492955}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 26,
volume = 121,
place = {United States},
year = {Thu Dec 27 00:00:00 EST 2018},
month = {Thu Dec 27 00:00:00 EST 2018}
}

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Cited by: 14 works
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Works referenced in this record:

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Cancellation of vacuum diagrams and the long-time limit in out-of-equilibrium diagrammatic quantum Monte Carlo
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Quantum Monte Carlo algorithm for out-of-equilibrium Green's functions at long times
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Reconstructing Nonequilibrium Regimes of Quantum Many-Body Systems from the Analytical Structure of Perturbative Expansions
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A Quantum Monte Carlo algorithm for out-of-equilibrium Green's functions at long times
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