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Proceedings Paper

Polaron size and ordering by x-ray absorption: the quantum confinement of a 2D Fermi liquid giving high-Tc superconductivity
Author(s): Antonio Bianconi; M. Missori; Hiroyuki Oyanagi; H. Yamaguchi
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Paper Abstract

We have found that the structure of the CuO2 plane of Bi2Sr2CaCu2O8+y (Bi2212) is anisotropic. Experimental investigation of the Cu site configurations in the CuO2 plane of Bi2Sr2CaCu2O8+y (Bi2212) by XANES and EXAFS shows that the quasi 2D Fermi liquid is confined in a superlattice of quantum stripes of width L running in the x direction. We have found that the recently proposed mechanism to rise the critical temperature by the confinement of an electron gas in superlattices and tuning the Fermi level to a shape resonance is verified. In fact the component of the Fermi wavevector kFy in the y direction perpendicular satisfies the condition kFy equals 2(pi) /L in Bi2212. This resonance gives an amplification of the critical temperature Tc by a factor of order of 5 in comparison with the critical temperature of the homogeneous CuO2 plane estimated to be about 15 - 20 K.

Paper Details

Date Published: 10 August 1994
PDF: 8 pages
Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); doi: 10.1117/12.182701
Show Author Affiliations
Antonio Bianconi, Univ. di Roma (Italy)
M. Missori, Univ. di Roma (Italy)
Hiroyuki Oyanagi, Electrotechnical Lab. (Japan)
H. Yamaguchi, Electrotechnical Lab. (Japan)


Published in SPIE Proceedings Vol. 2158:
Oxide Superconductor Physics and Nano-Engineering
Davor Pavuna; Ivan Bozovic, Editor(s)

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