TITLE:
Oxygen Isotope Effects on Tc Related to Polaronic Superconductivity in Underdoped Cuprates
AUTHORS:
B. I. Kochelaev, K. A. Müller, A. Shengelaya
KEYWORDS:
Cuprates, High-Temperature Superconductivity, Polarons, Isotope Effect
JOURNAL NAME:
Journal of Modern Physics,
Vol.5 No.6,
April
28,
2014
ABSTRACT: The
planar oxygen isotope effect on Tc observed in copper oxide superconductors is remarkable in that it increases
from near nil at optimal doping to a value twice that derived from BCS theory
in the underdoped region. This behavior is quantitatively followed by a formula proposed by Kresin and Wolf in 1994 for polarons along the c-axis. Herein it is revisited in a more transparent way, and it is
pointed out that the heterogeneity of pairing is relevant and has to be taken
into account to explain the unusual planar isotope effects on Tc in underdoped cuprates.