Chemical doping and improved flux pinning in Hg-based superconductors

K. Kishio; J. Shimoyama; A. Yoshikawa; K. Kitazawa; O. Chmaissem; J. D. Jorgensen

doi:10.1007/BF00753889

Chemical doping and improved flux pinning in Hg-based superconductors

K. Kishio, J. Shimoyama, A. Yoshikawa, K. Kitazawa, O. Chmaissem, J. D. Jorgensen

Research output: Contribution to journal › Article › peer-review

48 Citations (Scopus)

Abstract

Chemical doping of a small amount (0.02∼0.3) of rhenium (Re) ion into HgBa₂Ca_n-1Cu_nO_y(n=1∼4) has been studied. The flux pinning strength in these Hg-based superconductors is significantly enhanced compared to the undoped parent materials. Neutron diffraction analysis of representative samples (n=3) revealed that Re partially substitutes the Hg-site with octahedrally fully coordinated oxygen atoms, giving rise to the stabilization of Hg(Re)O layer and reduction of this blocking layer thickness. Associated with the expected hybridization of Re-5d and O-2p orbitals and possible metallization of the Hg(Re)O layer, the improved flux pinning behavior is considered to be caused by the decrease of the electromagnetic anisotropy and the enhanced interlayer superconducting coupling strength.

Original language	English
Pages (from-to)	1359-1365
Number of pages	7
Journal	Journal of Low Temperature Physics
Volume	105
Issue number	5-6
DOIs	https://doi.org/10.1007/BF00753889
Publication status	Published - 1996 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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10.1007/BF00753889

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abstract = "Chemical doping of a small amount (0.02∼0.3) of rhenium (Re) ion into HgBa2Can-1CunOy(n=1∼4) has been studied. The flux pinning strength in these Hg-based superconductors is significantly enhanced compared to the undoped parent materials. Neutron diffraction analysis of representative samples (n=3) revealed that Re partially substitutes the Hg-site with octahedrally fully coordinated oxygen atoms, giving rise to the stabilization of Hg(Re)O layer and reduction of this blocking layer thickness. Associated with the expected hybridization of Re-5d and O-2p orbitals and possible metallization of the Hg(Re)O layer, the improved flux pinning behavior is considered to be caused by the decrease of the electromagnetic anisotropy and the enhanced interlayer superconducting coupling strength.",

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AU - Kishio, K.

AU - Shimoyama, J.

AU - Yoshikawa, A.

AU - Kitazawa, K.

AU - Chmaissem, O.

AU - Jorgensen, J. D.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - Chemical doping of a small amount (0.02∼0.3) of rhenium (Re) ion into HgBa2Can-1CunOy(n=1∼4) has been studied. The flux pinning strength in these Hg-based superconductors is significantly enhanced compared to the undoped parent materials. Neutron diffraction analysis of representative samples (n=3) revealed that Re partially substitutes the Hg-site with octahedrally fully coordinated oxygen atoms, giving rise to the stabilization of Hg(Re)O layer and reduction of this blocking layer thickness. Associated with the expected hybridization of Re-5d and O-2p orbitals and possible metallization of the Hg(Re)O layer, the improved flux pinning behavior is considered to be caused by the decrease of the electromagnetic anisotropy and the enhanced interlayer superconducting coupling strength.

AB - Chemical doping of a small amount (0.02∼0.3) of rhenium (Re) ion into HgBa2Can-1CunOy(n=1∼4) has been studied. The flux pinning strength in these Hg-based superconductors is significantly enhanced compared to the undoped parent materials. Neutron diffraction analysis of representative samples (n=3) revealed that Re partially substitutes the Hg-site with octahedrally fully coordinated oxygen atoms, giving rise to the stabilization of Hg(Re)O layer and reduction of this blocking layer thickness. Associated with the expected hybridization of Re-5d and O-2p orbitals and possible metallization of the Hg(Re)O layer, the improved flux pinning behavior is considered to be caused by the decrease of the electromagnetic anisotropy and the enhanced interlayer superconducting coupling strength.

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Chemical doping and improved flux pinning in Hg-based superconductors

Abstract

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