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  Probing optically silent superfluid stripes in cuprates

Rajasekaran, S., Okamoto, J., Mathey, L., Fechner, M., Thampy, V., Gu, G. D., et al. (2018). Probing optically silent superfluid stripes in cuprates. Science, 359(6375), 575-579. doi:10.1126/science.aan3438.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-63E0-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-F4E1-D
Genre: Journal Article

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https://dx.doi.org/10.1126/science.aan3438 (Publisher version)
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 Creators:
Rajasekaran, S.1, Author              
Okamoto, J.2, Author
Mathey, L.2, Author
Fechner, M.1, Author              
Thampy, V.3, Author
Gu, G. D.3, Author
Cavalleri, A.1, 4, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2Centre for Optical Quantum Technologies and Institute for Laser Physics, University of Hamburg, Hamburg, Germany., ou_persistent22              
3Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, 11973 NY, USA., ou_persistent22              
4Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK., ou_persistent22              

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 Abstract: In many theoretical models of high-temperature superconductors, remnants of superconductivity persist to temperatures higher than the transition temperature, TC. Rajasekaran et al. used nonlinear terahertz spectroscopy to probe this region of the phase diagram of a cuprate superconductor that is well known for a stripe phase that appears for certain doping levels (see the Perspective by Erge˛ cen and Gedik). For a sample deep in the stripe phase, a large nonlinear signal persisted from the superconducting region up to temperatures much higher than TC. The findings suggest the formation of a peculiar spatially modulated superconducting state called the pair-density wave.Science, this issue p. 575; see also p. 519Unconventional superconductivity in the cuprates coexists with other types of electronic order. However, some of these orders are invisible to most experimental probes because of their symmetry. For example, the possible existence of superfluid stripes is not easily validated with linear optics, because the stripe alignment causes interlayer superconducting tunneling to vanish on average. Here we show that this frustration is removed in the nonlinear optical response. A giant terahertz third harmonic, characteristic of nonlinear Josephson tunneling, is observed in La1.885Ba0.115CuO4 above the transition temperature Tc = 13 kelvin and up to the charge-ordering temperature Tco = 55 kelvin. We model these results by hypothesizing the presence of a pair density wave condensate, in which nonlinear mixing of optically silent tunneling modes drives large dipole-carrying supercurrents.

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Language(s): eng - English
 Dates: 2017-03-302017-12-222018-02-02
 Publication Status: Published in print
 Pages: 5
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1126/science.aan3438
BibTex Citekey: Rajasekaran575
arXiv: 1705.06112
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Project name : The research leading to these results received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013) and ERC grant agreement no. 319286 [Frontiers in Quantum Materials’ Control (Q-MAC)]. Work performed at Brookhaven was supported by the U.S. Department of Energy, Division of Materials Science under contract no. DE-AC02-98CH10886.
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Title: Science
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Association for the Advancement of Science
Pages: - Volume / Issue: 359 (6375) Sequence Number: - Start / End Page: 575 - 579 Identifier: ISSN: 0036-8075
CoNE: /journals/resource/991042748276600_1