d-wave superconductivity of the hole-doped(SrCa)10Cu17O29ladder compound
| Autor: | V. Yu. Tarenkov, Stanislaw J. Lewandowski, L. I. Leonyuk, A. I. D’yachenko, I. Abal'osheva, A. Abal'oshev, R. Szymczak |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Physical Review B. 61:1500-1505 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.61.1500 |
| Popis: | We performed tunneling experiments on single crystals of hole-doped two-leg ladders $(\mathrm{SrCa}{)}_{10}{\mathrm{Cu}}_{17}{\mathrm{O}}_{29}$ with ${T}_{c}\ensuremath{\cong}75$ K and, for reference purposes, on textured bulk samples of ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8}$ (Bi2212). Point-contact and break-junction (Bi2212 only) junction configurations were used. The point-contact junctions, both superconductor--insulator--normal-metal and superconductor--normal-metal, were using Ag counterelectrodes. In all experiments the tunneling direction was along ${\mathrm{Cu}}_{2}{\mathrm{O}}_{3}$ planes (for the ladders) and ${\mathrm{CuO}}_{2}$ planes (for Bi2212). The recorded tunneling conductance spectra were reproducible with sharp, well-defined energy-gap structures. All junctions exhibited a pronounced zero-bias conductance peak disappearing at the critical temperature. Experimental results are consistent with the formation of zero-energy Andreev bound states at the surface of the superconductors and ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$-wave symmetry of the order parameter $\ensuremath{\Delta}$ in both compounds. |
| Databáze: | OpenAIRE |
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