Polaron size and ordering by x-ray absorption: the quantum confinement of a 2D Fermi liquid giving high-Tc superconductivity

Antonio Bianconi; M. Missori; Hiroyuki Oyanagi; H. Yamaguchi

doi:10.1117/12.182701

10 August 1994 Polaron size and ordering by x-ray absorption: the quantum confinement of a 2D Fermi liquid giving high-T_c superconductivity

Antonio Bianconi, M. Missori, Hiroyuki Oyanagi, H. Yamaguchi

Author Affiliations +

Proceedings Volume 2158, Oxide Superconductor Physics and Nano-Engineering; (1994) https://doi.org/10.1117/12.182701
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

We have found that the structure of the CuO₂ plane of Bi₂Sr₂CaCu₂O_8+y (Bi2212) is anisotropic. Experimental investigation of the Cu site configurations in the CuO₂ plane of Bi₂Sr₂CaCu₂O_8+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 k_Fy in the y direction perpendicular satisfies the condition k_Fy equals 2(pi) /L in Bi2212. This resonance gives an amplification of the critical temperature T_c 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.

Citation Download Citation

Antonio Bianconi, M. Missori, Hiroyuki Oyanagi, and H. Yamaguchi "Polaron size and ordering by x-ray absorption: the quantum confinement of a 2D Fermi liquid giving high-T_c superconductivity", Proc. SPIE 2158, Oxide Superconductor Physics and Nano-Engineering, (10 August 1994); https://doi.org/10.1117/12.182701

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