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J. Phys. I France
Volume 4, Number 3, March 1994
Page(s) 361 - 365
DOI: 10.1051/jp1:1994100
J. Phys. I France 4 (1994) 361-365

Short Communication

High ${\rm T_c}$ superconductivity by quantum confinement

A. Bianconi and M. Missori

Università di Roma, Dipartimento di Fisica, P.A. Moro 2, 00185 Roma, Italy

(Received 21 December 1993, accepted 4 January 1994)

We report the results of a careful experimental investigation of the Cu site configurations in the CuO 2 plane of Bi 2Sr 2CaCu 2O 8+y (Bi2212) showing that the quasi 2D Fermi liquid is confined in the stripes of width L with a superlattice period $\lambda_p = 4.65a$. The high T c superconductivity is stabilized at high temperature by tuning the Fermi energy of the 2D electron gas to the quantum resonance $k_{F_y} = 2\pi/L$. The confinement of a 3D electron gas in quantum wires can be realized by synthetizing Bi-Ca-Sr-Cu-0 systems with some adjacent CuO 2 layers forming a metallic slab of thickness H. In this case the amplification of the critical temperature is assigned to quantization of the wavevectors along both the y and z directions satisfying the $k_{F_y} = 2\pi/L$ and $k_{F_z} = m\pi/H$ conditions.

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