Direct observation of Fermi surface in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">YBa</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>7</mn><mi mathvariant="normal">−</mi><mi mathvariant="normal">δ</mi></mrow></msub></mrow></math>

H. Haghighi; J. H. Kaiser; S. Rayner; R. N. West; J. Z. Liu; R. Shelton; R. H. Howell; F. Solal; M. J. Fluss

doi:10.1103/PhysRevLett.67.382

Direct observation of Fermi surface in ${YBa}_{2}$ ${Cu}_{3}$ $O_{7 - δ}$

H. Haghighi, J. H. Kaiser, S. Rayner, R. N. West, J. Z. Liu, R. Shelton, R. H. Howell, F. Solal, and M. J. Fluss

Phys. Rev. Lett. 67, 382 – Published 15 July 1991

Abstract

We have performed a high-precision measurement (5× $10^{8}$ coincidence counts) of the basal-plane electron-positron momentum density in well oxygenated, twin-free, single crystals of ${YBa}_{2}$ ${Cu}_{3}$ $O_{7 - δ}$ . The raw, processed, and K-space reduced spectra unambiguously show a clear image of a major Fermi surface sheet. The form and profile of that image are in substantial quantitative agreement with theoretical predictions of a Γ-X electron ridge section associated with states in the CuO chains.

Received 15 February 1991

DOI:https://doi.org/10.1103/PhysRevLett.67.382

Authors & Affiliations

H. Haghighi, J. H. Kaiser, S. Rayner, R. N. West, J. Z. Liu, R. Shelton, R. H. Howell, F. Solal, and M. J. Fluss

University of Texas at Arlington, Arlington, Texas 76019 University of California at David, Davis, California 95616 Lawrence Livermore National Laboratory, Livermore, California 94550