An oxygen isotope shift is observed in superconducting La1.85Sr0.15CuO4 when 18O is substituted partially for 16O; the superconducting transition temperature Tc is lowered by 0.3 to 1.0 K in different samples. We examine these results using conventioanl phonon-mediated BCS theory and conclude that, for La1.85Sr0.15CuO4, phonons play an important role in the pairing mechanism.
Published in Physical Review Letters, Volume 59, Issue 8, 1987, pages 915-918.
© 1987 The American Physical Society
Publisher's Version: http://link.aps.org/doi/10.1103/PhysRevLett.59.915
PACS: 74.70.Ya, 74.30.-e