Anomalous Isotopic Effect Near the Charge-Ordering Quantum Criticality. Andergassen, S., Caprara, S., Di Castro, C., & Grilli, M. Physical Review Letters, 87(5):056401+, 2001.
Anomalous Isotopic Effect Near the Charge-Ordering Quantum Criticality [link]Paper  doi  abstract   bibtex   
Within the Hubbard-Holstein model, we evaluate the crossover lines marking the opening of pseudogaps in the cuprates, which, in our scenario, are ruled by the proximity to a charge-ordering quantum criticality (stripe formation). We find that their isotopic dependence, due to critical fluctuations, implies a substantial positive shift of the pseudogap-formation temperature T*. We infer that the isotopic shift of the superconducting Tc is nearly absent in the optimally and overdoped regimes and is negative and increasing upon underdoping. The dynamical nature of the charge-ordering transition may explain the spread of the experimental values of T*.
@article{andergassen_anomalous_2001,
	title = {Anomalous {Isotopic} {Effect} {Near} the {Charge}-{Ordering} {Quantum} {Criticality}},
	volume = {87},
	issn = {0031-9007},
	url = {http://dx.doi.org/10.1103/physrevlett.87.056401},
	doi = {10.1103/physrevlett.87.056401},
	abstract = {Within the Hubbard-Holstein model, we evaluate the crossover lines marking the opening of pseudogaps in the cuprates, which, in our scenario, are ruled by the proximity to a charge-ordering quantum criticality (stripe formation). We find that their isotopic dependence, due to critical fluctuations, implies a substantial positive shift of the pseudogap-formation temperature T*. We infer that the isotopic shift of the superconducting Tc is nearly absent in the optimally and overdoped regimes and is negative and increasing upon underdoping. The dynamical nature of the charge-ordering transition may explain the spread of the experimental values of T*.},
	number = {5},
	journal = {Physical Review Letters},
	author = {Andergassen, S. and Caprara, S. and Di Castro, C. and Grilli, M.},
	year = {2001},
	pages = {056401+}
}

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