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  Anomalous relaxation kinetics and charge density wave correlations in underdoped BaPb1-xBixO3

Nicoletti, D., Casandruc, E., Fu, D., Giraldo-Gallo, P., Fisher, I., & Cavalleri, A. (2017). Anomalous relaxation kinetics and charge density wave correlations in underdoped BaPb1-xBixO3. Proceedings of the National Academy of Sciences of the United States of America, 114(34), 9020-9025. doi:10.1073/pnas.1707079114.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-C5AC-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-BF42-B
Genre: Journal Article

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https://dx.doi.org/10.1073/pnas.1707079114 (Publisher version)
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https://dx.doi.org/10.1073/pnas.1714858114 (Supplementary material)
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 Creators:
Nicoletti, D.1, Author              
Casandruc, E.1, Author              
Fu, D.1, Author              
Giraldo-Gallo, P.2, 3, Author
Fisher, I.2, 4, Author
Cavalleri, A.1, 5, 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              
2Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305; , ou_persistent22              
3Department of Physics, Stanford University, Stanford, CA 94305; , ou_persistent22              
4Department of Applied Physics, Stanford University, Stanford, CA 94305; , ou_persistent22              
5Department of Physics, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom , ou_persistent22              

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Free keywords: charge-density waves, superconductivity, bismuthates, ultrafast spectroscopy
 Abstract: Superconductivity often emerges in proximity of other symmetry-breaking ground states, such as antiferromagnetism or charge-density-wave (CDW) order. However, the subtle interrelation of these phases remains poorly understood, and in some cases even the existence of short-range correlations for superconducting compositions is uncertain. In such circumstances, ultrafast experiments can provide new insights by tracking the relaxation kinetics following excitation at frequencies related to the broken-symmetry state. Here, we investigate the transient terahertz conductivity of BaPb1−xBixO3––a material for which superconductivity is “adjacent” to a competing CDW phase––after optical excitation tuned to the CDW absorption band. In insulating BaBiO3 we observed an increase in conductivity and a subsequent relaxation, which are consistent with quasiparticles injection across a rigid semiconducting gap. In the doped compound BaPb0.72Bi0.28O3 (superconducting below TC = 7 K), a similar response was also found immediately above TC. This observation evidences the presence of a robust gap up to T ≃ 40 K, which is presumably associated with short-range CDW correlations. A qualitatively different behavior was observed in the same material for T≳ 40 K. Here, the photoconductivity was dominated by an enhancement in carrier mobility at constant density, suggestive of melting of the CDW correlations rather than excitation across an optical gap. The relaxation displayed a temperature-dependent, Arrhenius-like kinetics, suggestive of the crossing of a free-energy barrier between two phases. These results support the existence of short-range CDW correlations above TC in underdoped BaPb1−xBixO3, and provide information on the dynamical interplay between superconductivity and charge order.

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Language(s): eng - English
 Dates: 2017-05-012017-07-172017-08-082017-08-22
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1073/pnas.1707079114
arXiv: 1706.06999
 Degree: -

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Project name : European Research Council (ERC) under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement 319286 (QMAC). We acknowledge support from the Deutsche Forschungsgemeinschaft via the excellence cluster “The Hamburg Centre for Ultrafast Imaging—Structure, Dynamics and Control of Matter at the Atomic Scale” and the Priority Program SFB925. Work at Stanford University was supported by the AFOSR (Air Force Office of Scientific Research), Grant FA9550-09-1-0583.
Grant ID : 319286
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : Proc. Acad. Sci. USA
  Other : Proc. Acad. Sci. U.S.A.
  Abbreviation : PNAS
Source Genre: Journal
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Publ. Info: -
Pages: 6 Volume / Issue: 114 (34) Sequence Number: - Start / End Page: 9020 - 9025 Identifier: ISSN: 0027-8424
CoNE: /journals/resource/954925427230