O K-edge RIXS energy dependence of low-energy excitations in underdoped La(2-x)SrxCuO4

The insulator to superconductor phase boundary is a poorly understood region of the phase diagram of the cuprates. A better understanding of the electronic structure of these complex materials in this crucial region would probably represent a major step towards a theory of high temperature superconductivity. In particular, it has been proposed that persistent magnetic fluctuations could provide the pairing “glue” [1]. In this study, we have used Resonant Inelastic x-ray Scattering (RIXS), a novel probe of electronic and magnetic excitations in solids. We have investigated the low-energy excitations at O K-edge in the paradigmatic cuprate material La(2-x)SrxCuO4 (LSCO), as a function of doping ranging from an insulator to a bad metal (superconductor). We identify the signatures of bimagnon excitations, which persist in the underdoped superconductor. Remarkably, we have been able to resolve a double peak structure at  2 eV, for which previous theoretical calculations suggest a Zhang-Rice singlet nature [2-3].

    Keywords: MPBHc


    REFERENCES : [1] A. Abanov, A. Chubukov, and A.V. Schmalian, Adv. Phys. 52, 119 (2003).
 [2] K. Okada and A. Kotani: Phys Rev B 63, 045103 (2001). [3] K. Okada and A. Kotani: J. Synchrotron Rad. 8 243-245 (2001).


    • EPFL-POSTER-206797

    Record created on 2015-03-19, modified on 2016-08-09

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