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Isotope effects and possible pairing mechanism in optimally doped cuprate superconductors | | Guo-meng Zhao
; Vidula Kirtikar
; Donald E. Morris
; | | Date: |
22 Apr 2002 | | Journal: | Phys. Rev. B (Rapid Communications) 63, 220506 (2001) | | Subject: | Superconductivity; Materials Science | cond-mat.supr-con cond-mat.mtrl-sci | | Abstract: | We have studied the oxygen-isotope effects on T_{c} and in-plane penetration depth lambda_{ab}(0) in an optimally doped 3-layer cuprate Bi_{1.6}Pb_{0.4}Sr_{2}Ca_{2}Cu_{3}O_{10+y} (T_{c} sim 107 K). We find a small oxygen-isotope effect on T_{c} (alpha_{O} = 0.019), and a substantial effect on lambda_{ab} (0) (Delta lambda_{ab} (0)/lambda_{ab} (0) = 2.5pm0.5%). The present results along with the previously observed isotope effects in single-layer and double-layer cuprates indicate that the isotope exponent alpha_{O} in optimally doped cuprates is small while the isotope effect on the in-plane effective supercarrier mass is substantial and nearly independent of the number of the CuO_{2} layers. A plausible pairing mechanism is proposed to explain the isotope effects, high-T_{c} superconductivity and tunneling spectra in a consistent way. | | Source: | arXiv, cond-mat/0204448 | | Services: | Forum | Review | PDF | Favorites | |
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