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Evidence for strong lattice effects as revealed from huge unconventional oxygen isotope effects on the pseudogap temperature in La2-xSrxCuO4

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Simon,  A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Bussmann-Holder,  A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Electronic Structure Theory (Ali Alavi), Max Planck Institute for Solid State Research, Max Planck Society;
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Bendele, M., von Rohr, F., Guguchia, Z., Pomjakushina, E., Conder, K., Bianconi, A., et al. (2017). Evidence for strong lattice effects as revealed from huge unconventional oxygen isotope effects on the pseudogap temperature in La2-xSrxCuO4. Physical Review B, 95(1): 014514.


Cite as: https://hdl.handle.net/21.11116/0000-000E-D478-C
Abstract
The oxygen isotope (O-16/O-18) effect (OIE) on the pseudogap (charge-stripe ordering) temperature T* is investigated for the cuprate superconductor La2-xSrxCuO4 as a function of doping x by means of x-ray absorption near edge structure studies. A strong x dependent and sign reversed OIE on T* is observed. The OIE exponent alpha(T*) systematically decreases from alpha(T*) = -0.6(1.3) for x = 0.15 to alpha(T*) = -4.4(1.1) for x = 0.06, corresponding to increasing T* and decreasing superconducting transition temperature T-c. Both T* (O-16) and T* (O-18) exhibit a linear doping dependence with different slopes and critical end points [where T* (O-16) and T* (O-18) fall to zero] at x(c) (O-16) = 0.201(4) and xc (O-18) = 0.182(3), indicating a large positive OIE of xc with an exponent of alpha(xc) = 0.84(22). The remarkably large and strongly doping dependent OIE on T* signals a substantial involvement of the lattice in the formation of the pseudogap, consistent with a polaronic approach to cuprate superconductivity and the vibronic character of its ground state.