Pairing symmetry and spin-polarized quasiparticle transport in high-temperature superconducting cuprates

Nai-Chang Yeh; Chu-Cheng Fu; Ching-Tzu Chen; Z. Huang; Richard P. Vasquez; Setsuko Tajima

doi:10.1117/12.397825

6 September 2000 Pairing symmetry and spin-polarized quasiparticle transport in high-temperature superconducting cuprates

Nai-Chang Yeh, Chu-Cheng Fu, Ching-Tzu Chen, Z. Huang, Richard P. Vasquez, Setsuko Tajima

Author Affiliations +

Proceedings Volume 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV; (2000) https://doi.org/10.1117/12.397825
Event: AeroSense 2000, 2000, Orlando, FL, United States

Abstract

The pairing symmetry and the superconducting gap in high- temperature superconducting cuprates are investigated as a function of the hole doping level (x) and temperature (T), using directional scanning tunneling spectroscopy (STS). It is found that the predominant pairing symmetry is (Formula available in paper), which is insensitive to the variations in T and x. In contrast, the maximum superconducting gap ((Delta) _d) in YBa₂Cu₃O_7-(delta ) and La_2-xSr_xCuO_4-(delta ) scales with the superconducting transition temperature (T_c), and the ratio of (2 (Delta) _d/k_BT_c) increases with decreasing doping level. The dominance of d_x2_-y2 pairing is consistent with strong spatial variations in the local quasiparticle spectra near non-magnetic impurities such as Zn and Mg in a (Zn,Mg)-doped YBa₂Cu₃O_7-(delta ) single crystal. To further elucidate the nature of the pairing state, the c-axis spin- polarized quasiparticle transport in the superconducting state of YBa₂Cu₃O_7-(delta ) is investigated by studying the critical currents and STS under the injection of electrical currents from the underlying ferromagnetic La_0.7Sr_0.3MnO₃ layer in various ferromagnet-insulator-superconductor (F-I-S) heterostructures. The temperature dependent spin diffusion length ((delta) _s) and signatures of nonequilibrium quasiparticle distribution under spin injection in d-wave superconductors are determined for the first time.

Citation Download Citation

Nai-Chang Yeh, Chu-Cheng Fu, Ching-Tzu Chen, Z. Huang, Richard P. Vasquez, and Setsuko Tajima "Pairing symmetry and spin-polarized quasiparticle transport in high-temperature superconducting cuprates", Proc. SPIE 4058, Superconducting and Related Oxides: Physics and Nanoengineering IV, (6 September 2000); https://doi.org/10.1117/12.397825

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