High-<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></mrow></math></span> superconductor <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">Y</mi><mrow><msub><mrow><mi mathvariant="normal">Ba</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>7</mn><mo>−</mo><mi>δ</mi></mrow></msub></mrow></math></span> studied by positron annihilation

S. J. Wang; S. V. Naidu; S. C. Sharma; D. K. De; D. Y. Jeong; T. D. Black; S. Krichene; J. R. Reynolds; J. M. Owens

doi:10.1103/PhysRevB.37.603

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High- $T_{c}$ superconductor $Y {Ba}_{2} {Cu}_{3} O_{7 - δ}$ studied by positron annihilation

S. J. Wang, S. V. Naidu, S. C. Sharma, D. K. De, D. Y. Jeong, T. D. Black, S. Krichene, J. R. Reynolds, and J. M. Owens

Phys. Rev. B 37, 603(R) – Published 1 January 1988

Abstract

We have measured the positron-lifetime and the Doppler-broadening spectra in the high-temperature superconductor $Y {Ba}_{2} {Cu}_{3} O_{7 - δ}$ as a function of temperature between 77 and 295 K. Positron-lifetime and Doppler-broadening data show new features in the superconducting phase. These results are interpreted in terms of positron localization in lattice distortions and positron surface states.

Received 26 August 1987

DOI:https://doi.org/10.1103/PhysRevB.37.603

Authors & Affiliations

S. J. Wang^*, S. V. Naidu, S. C. Sharma^†, D. K. De, D. Y. Jeong, and T. D. Black

Center for Positron Studies, Department of Physics, The University of Texas at Arlington, Arlington, Texas 76019

S. Krichene and J. R. Reynolds

Department of Chemistry, The University of Texas at Arlington, Arlington, Texas 76019

J. M. Owens^‡

Center for Advanced Electron Devices and Systems, The University of Texas at Arlington, Arlington, Texas 76019

^*Permanent address: Wuhan University, People's Republic of China.
^†To whom all correspondence should be addressed.
^‡Present address: Department of Electrical Engineering and Computer Science, Santa Clara University, Santa Clara, California.

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Vol. 37, Iss. 1 — 1 January 1988

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