Superposition structure of crystal field spectra in high-Tc superconductors: Overdoped regime

N. O. Golosova, V. I. Bobrovskiǐ, E. B. Mitberg, A. A. Podlesnyak, I. L. Zhdakhin, A. V. Mirmelstein

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Experiments on inelastic scattering of neutrons show that the crystal field spectra for high-Tc superconductors R1-y.Ca yBa2Cu3Ox=7 (R = Ho, Er; 0 < y < 0.25) have two spectral components associated with optimally doped and overdoped clusters, respectively. An increase in the calcium concentration does not affect the local density of charge carriers in clusters, but changes the concentration of clusters themselves and, hence, the spectral weights of the spectral components. In light of such a "two-phase" pattern observed earlier for cupratebased superconductors with a doping level below optimal, an increase in the charge carrier concentration leads to a smooth transition (crossover) from the underdoped regime to the overdoped one. The obtained results show, however, that these two regions of the phase diagram differ qualitatively in the form of charge distribution in CuO2 planes responsible for superconductivity.

Original languageEnglish
Pages (from-to)1013-1025
Number of pages13
JournalJournal of Experimental and Theoretical Physics
Volume94
Issue number5
DOIs
StatePublished - May 2002
Externally publishedYes

Funding

This work was supported financially by the Russian Foundation for Basic Research (project no. 00-02-17370); state contract nos. 107-19(00)-P-D01 and 107-1(00)-P-D01; the Russian State Program Supporting the Leading Scientific Schools (project no. 00-15-96581); INTAS (grant no. 99-00256); and the 6th Competition–Expertise of Young Scientists, Russian Academy of Sciences (1999) (grant no. 67).

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