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Extracting the dynamical effective interaction and competing order from an analysis of Raman spectra of the high-temperature La2-xSrxCuO4 superconductor (Articolo in rivista)

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Extracting the dynamical effective interaction and competing order from an analysis of Raman spectra of the high-temperature La2-xSrxCuO4 superconductor (Articolo in rivista) (literal)

Anno

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Alternative label

S. Caprara (1); C. Di Castro (1); B. Muschler (2); W. Prestel (2); R. Hackl (2); M. Lambacher (2); A. Erb (2); S. Komiya (3); Y. Ando (4); M. Grilli (1) (2011)
Extracting the dynamical effective interaction and competing order from an analysis of Raman spectra of the high-temperature La2-xSrxCuO4 superconductor
in Physical review. B, Condensed matter and materials physics
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

S. Caprara (1); C. Di Castro (1); B. Muschler (2); W. Prestel (2); R. Hackl (2); M. Lambacher (2); A. Erb (2); S. Komiya (3); Y. Ando (4); M. Grilli (1) (literal)

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Note

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1) CNR-ISC, CNISM, and Dipartimento di Fisica, Università di Roma \"La Sapienza\", P.le Aldo Moro 5, 00185 Roma, Italy 2) Walther Meissner Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany 3) Central Research Institute of the Electric Power Industry, Komae, Tokyo 201-8511, Japan 4) Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan (literal)

Titolo

Extracting the dynamical effective interaction and competing order from an analysis of Raman spectra of the high-temperature La2-xSrxCuO4 superconductor (literal)

Abstract

We discuss the problem of the glue mediating the effective electron-electron interaction and the related order underlying superconductivity in the cuprates. Assuming as mediators spin and charge fluctuations with different characteristic wavevectors, we calculate the Raman response function including self-energy and vertex corrections. In this way, exploiting the related cancellations, we are able to individuate the charge and spin contributions in the Raman response function. Raman scattering experiments in La2-xSrxCuO4 single crystals have been systematically carried out at various doping levels x. By fitting the experimental spectra within the above theoretical framework, we find a charge and spin nearly ordered state, whose fluctuations give rise to a spin dominated glue function at intermediate doping and a charge dominated one above optimal doping. (literal)

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