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Since the early days of the discovery of hole doped high-Tc cuprates, thevariation of the oxygen isotope exponent (IE) with the number of doped holes,p, in the CuO2 planes has been a source of considerable debate. There is agrowing acceptance in the high-Tc community that the mediating bosons leadingto Cooper pairing have largely electronic character. At the same time there isan increasing acknowledgement that at some level the lattice-chargeinteractions might be important in cuprates. The experimentally observedsubstantially large IE over certain doping range always casts a shadow over anyproposal where non-phononic mechanism is invoked. Besides, the various existingtheoretical schemes, based on electron-phonon interactions, cannot describe theanomalous features shown by the IE as a function of holeconcentration/disorder, either quantitatively or qualitatively. Based on arecent experiment relating the possibility of Fermi-surface reconstruction tothe thermoelectric transport measurements (Nature Commun. 2:432 doi:10.1038/ncomms1440 (2011)), we propose here a simple scenario where isotopesubstitutions affect the charge/spin stripe state via the coupling to theunderlying lattice and thereby change the superconducting Tc. In this picture,significant part of the IE, over an extended p-range, actually originates fromthe isotope induced stripe modulation and is not directly related to thecharacteristic energy scale of the pairing phonons as is the case inconventional BCS theory. Our proposal qualitatively explains all the disorder-and p-dependent features of the IE seen in hole doped high-Tc cuprates. We alsoprovide with an outline of some experiments that can verify the degree ofvalidity of the proposed scenario.

The doping and disorder dependent variation of the isotope exponent in hole doped cuprates: A non-superconducting perspective