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Raman study of carrier-overdoping effects on the gap in high-Tc superconducting cuprates | | T. Masui
; M. Limonov
; H. Uchiyama
; S. Lee
; S. Tajima
; A. Yamanaka
; | | Date: |
7 Aug 2003 | | Journal: | Phys. Rev. B 68, 060506(R) (2003) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | Raman scattering in the heavily overdoped (Y,Ca)Ba_2Cu_3O_{7-d} (T_c = 65 K) and Bi_2Sr_2CaCu_2O_{8+d} (T_c = 55 K) crystals has been investigated. For the both crystals, the electronic pair-breaking peaks in the A_{1g} and B_{1g} polarizations were largely shifted to the low energies close to a half of 2Delta_0, Delta_0 being the maximum gap. It strongly suggests s-wave mixing into the d-wave superconducting order parameter and the consequent manifestation of the Coulomb screening effect in the B_{1g}-channel. Gradual mixing of s-wave component with overdoping is not due to the change of crystal structure symmetry but a generic feature in all high-T_c superconducting cuprates. | | Source: | arXiv, cond-mat/0308130 | | Services: | Forum | Review | PDF | Favorites | |
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