Intrinsic percolative superconductivity in heavily overdoped high-temperature superconductors

H. H. Wen; S. L. Li; Z. W. Zhao; Z. Y. Liu; H. P. Yang; D. N. Zheng; Z. X. Zhao

doi:10.1209/epl/i2002-00570-7

All issues

Volume 57 / No 2 (January 2002)

Europhys. Lett., 57 2 (2002) 260-266

Abstract

Issue		Europhys. Lett. Volume 57, Number 2, January 2002


Page(s)		260 - 266
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2002-00570-7
Published online		01 September 2002

Europhys. Lett., 57 (2), pp. 260-266 (2002)

Intrinsic percolative superconductivity in heavily overdoped high-temperature superconductors

H. H. Wen, S. L. Li, Z. W. Zhao, Z. Y. Liu, H. P. Yang, D. N. Zheng and Z. X. Zhao

National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences P.O. Box 603, Beijing 100080, PRC

Corresponding author: hhwen@aphy.iphy.ac.cn

Received: 28 June 2001
Accepted: 1 November 2001

Abstract

Magnetic measurements on heavily overdoped $\chem{La}$ $_{2-x}$ $\chem{Sr}$ _x $\chem{CuO}$ ₄, $\chem{Tl_2Ba_2CuO_6}$ , $\chem{Bi_2Sr_2CuO_6}$ , $\chem{Y}$ $_{1-x}$ ( $\chem{Ca}$ _x) $\chem{Ba_2Cu_3O_{7-\delta}}$ and $\chem{Bi_2Sr_2CaCu_2O_8}$ single crystals reveal a new type of magnetization hysteresis loops characterized by the vanishing of the usual central peak near zero field. Since this effect has been observed in various systems with very different structural details, it probably reflects a generic behavior for all high-temperature superconductors. This easy penetration of magnetic flux can be understood in the picture of percolative superconductivity due to the inhomogeneous electronic state in heavily overdoped regime.

PACS: 74.25.Bt – Thermodynamic properties / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)

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