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Frontiers of High Pressure Research II: Application of High Pressure to Low-Dimensional Novel Electronic Materials pp 371–382Cite as

Pressure-Induced Superconducting Phase Separation in Oxygen-Doped La2-xSrxCuO4+δ

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Part of the book series: NATO Science Series ((NAII,volume 48))

Abstract

The pressure effect on the superconducting transitions in La2-xSrxCuO4+δ is investigated by ac susceptibility measurements up to 2 GPa. Two series of samples with x=0 and x=0.015 and 0<δ<0.11 are compared with respect to the ambient and high pressure properties. At ambient pressure both sets of samples fit into the same phase diagram as a function of the total hole concentration (Sr– and oxygen doping contribute to the total carrier density, p). A single superconducting transition (Tc≈30 K) for p<0.085 splits into two transitions (Tc≈15 K and 30 K) at higher hole density indicating that electronic phase separation sets in above p=0.085. The pressure effect on Tc of the 30 K transition is unusually large, dTc (30)/dP≈10 K/GPa. The electronic phase separation at higher hole density is enhanced by pressure and Tc of the 15 K superconducting state exhibits a negative pressure shift, dTc (15)/dP≈-4 K/GPa. At a hole density close to 0.085 the electronic phase separation into the two superconducting states can be induced by pressure. The results are interpreted in terms of a strong correlation of the hole system and the interstitial (mobile) oxygen ions. Pressure, applied at ambient temperature, causes a redistribution of holes and oxygen and enhances superconductivity (Tc) as well as the tendency to phase separation.

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Authors and Affiliations

  1. Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, TX, 77204-5932, USA

    B. Lorenz, Z. G. Li & P.-H. Hor

  2. Department of Physics, Asahikawa Medical College, Asahikawa, 078-8510, Japan

    T. Honma

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  1. B. Lorenz
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  2. Z. G. Li
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  3. T. Honma
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  4. P.-H. Hor
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Editor information

Editors and Affiliations

  1. Department of Physics, Colorado State University, Fort Collins, CO, USA

    Hans D. Hochheimer

  2. Institute of Physical and Theoretical Chemistry, Wroclaw University of Technology, Wroclaw, Poland

    Bogdan Kuchta

  3. Department of Chemistry, Colorado State University, Fort Collins, CO, USA

    Peter K. Dorhout

  4. Department of Chemistry, University of Wyoming, Laramie, WY, USA

    Jeffery L. Yarger

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© 2001 Springer Science+Business Media Dordrecht

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Lorenz, B., Li, Z.G., Honma, T., Hor, PH. (2001). Pressure-Induced Superconducting Phase Separation in Oxygen-Doped La2-xSrxCuO4+δ . In: Hochheimer, H.D., Kuchta, B., Dorhout, P.K., Yarger, J.L. (eds) Frontiers of High Pressure Research II: Application of High Pressure to Low-Dimensional Novel Electronic Materials. NATO Science Series, vol 48. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0520-3_28

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  • DOI: https://doi.org/10.1007/978-94-010-0520-3_28

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-1-4020-0160-4

  • Online ISBN: 978-94-010-0520-3

  • eBook Packages: Springer Book Archive

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