Approximate tight-binding sum rule for the superconductivity-related change of c-axis kinetic energy in multilayer cuprate superconductors
| Authors | |
|---|---|
| Year of publication | 2003 |
| Type | Article in Periodical |
| Magazine / Source | Physical Review B |
| MU Faculty or unit | |
| Citation | |
| Field | Solid matter physics and magnetism |
| Keywords | High-Tc superconductors; infrared response; mechanism of superconductivity |
| Description | We present an extension of the c-axis tight-binding sum rule discussed by Chakravarty, Kee, and Abrahams [Phys. Rev. Lett. 82, 2366 (1999)] that applies to multilayer high-Tc cuprate superconductors (HTCS) and use it to estimate---from available infrared data---the change below Tc of the c-axis kinetic energy, , in YBa_{2}Cu_{3}O_{7-delta} (delta=0.45, 0.25, 0.07), Bi_{2}Sr_{2}CaCu_{2}O_{8}, and Bi_{2}Sr_{2}Ca_{2}Cu_{3}O_{10}. In all these compounds decreases below T_{c} and except for Bi_{2}Sr_{2}CaCu_{2}O_{8} the change of is of the same order of magnitude as the condensation energy. This observation supports the hypothesis that in multilayer HTCS superconductivity is considerably amplified by the interlayer tunneling mechanism. |
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