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Science 11 December 1987:
Vol. 238. no. 4833, pp. 1558 - 1560
DOI: 10.1126/science.238.4833.1558
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Articles

Oxygen Isotope Effect in High-Temperature Oxide Superconductors

HANS-CONRAD ZUR LOYE 1, KEVIN J. LEARY 1, STEVEN W. KELLER 1, WILLIAM K. HAM 1, TANYA A. FALTENS 1, JAMES N. MICHAELS 1, and ANGELICA M. STACY 1

1 College of Chemistry, University of California, and Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720.

The effect of oxygen isotope substitution on the superconducting transition temperature, Tc, has been measured for BaBi0.25Pb0.75O3 (Tc, ap 11 K) and Lal1.85 Ca0.15CuO4 (Tc ap 20 K), and is compared to the shifts observed for La1.85Sr0.15CuO4 (Tc ap 37 K) and YBa2Cu3O7 (Tc ap 92 K). For all four materials, the transition temperature is shifted to lower temperature upon substitution of oxygen-18 for oxygen-16. The observed shifts demonstrate that phonons are involved in the electron-pairing mechanism in these oxide superconductors.

Submitted on August 19, 1987
Accepted on September 25, 1987

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Science. ISSN 0036-8075 (print), 1095-9203 (online)