Negative quantum interference between the electronic Raman scattering processes of CuO chains and CuO2 planes of heavily overdoped (Y, Ca)Ba2Cu3O(7-delta)

T Masui; M Limonov; H Uchiyama; S Tajima; A Yamanaka

doi:10.1103/PhysRevLett.95.207001

Negative quantum interference between the electronic Raman scattering processes of CuO chains and CuO2 planes of heavily overdoped (Y, Ca)Ba2Cu3O(7-delta)

Phys Rev Lett. 2005 Nov 11;95(20):207001. doi: 10.1103/PhysRevLett.95.207001. Epub 2005 Nov 9.

Authors

T Masui¹, M Limonov, H Uchiyama, S Tajima, A Yamanaka

Affiliation

¹ Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Tokyo 135-0062, Japan.

PMID: 16384088
DOI: 10.1103/PhysRevLett.95.207001

Abstract

We found a strong X-Y anisotropy of the pair-breaking peak in the Raman scattering of heavily overdoped (Y, Ca)Ba2Cu3O(7-delta) (T(c) = 65 K). The pair-breaking peak is radically suppressed in the YY-polarized spectrum. We ascribe this anomaly to the effect of quantum interference between the Raman processes of the CuO-chain and the CuO2-plane electronic excitations that might take place as a result of the increase in the transfer matrix due to overdoping.