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

Yeh, N.-C. and Fu, C.-C. and Chen, C.-T. and Huang, Z. and Vasquez, R. P. and Tajima, S. (2000) Pairing symmetry and spin-polarized quasiparticle transport in high-temperature superconducting cuprates. In: Superconducting and Related Oxides: Physics and Nanoengineering IV. Proceedings of SPIE. No.4058. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 60-74. ISBN 9780819436849.

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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 (d_(x^2 - y^2)), which is insensitive to the variations in T and x. In contrast, the maximum superconducting gap (Δ_d) in YBa_2Cu_3O_(7-∂) and La_(2-x)Sr_xCuO_(4-∂) scales with the superconducting transition temperature (T_c), and the ratio of (2Δ_d/k_BT)c) increases with decreasing doping level. The dominance of d_(x^2 - y^2) 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 YBa_2Cu_3O_(7-∂) single crystal. To further elucidate the nature of the pairing state, the c-axis spin- polarized quasiparticle transport in the superconducting state of YBa_2Cu_3O_(7-∂) is investigated by studying the critical currents and STS under the injection of electrical currents from the underlying ferromagnetic La_(0.7)Sr_(0.3)MnO_3 layer in various ferromagnet-insulator-superconductor (F-I-S) heterostructures. The temperature dependent spin diffusion length (∂_s) and signatures of nonequilibrium quasiparticle distribution under spin injection in d-wave superconductors are determined for the first time.

Item Type:Book Section
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Yeh, N.-C.0000-0002-1826-419X
Additional Information:© 2000 Society of Photo-Optical Instrumentation Engineers (SPIE). The work performed at Caltech is jointly supported by NSF Grant #DMR-9705171 and NASA/OSS. Part of the research was performed by the Center for Space Microelectronics Technology, Jet Propulsion Laboratory, Caltech, through an agreement with the National Aeronautics and Space Administration. The work performed at SRL/ISTEC in Japan has been partially supported by NEDO.
Funding AgencyGrant Number
New Energy and Industrial Technology Development Organization (NEDO)UNSPECIFIED
Subject Keywords:pairing symmetry, scanning tunneling spectroscopy (STS), cuprate superconductors, zero-bias conductance peak (ZBCP), spin-polarized quasiparticles, F-I-S heterostructures, spin diffusion length, nonequiibrium superconductivity
Series Name:Proceedings of SPIE
Issue or Number:4058
Record Number:CaltechAUTHORS:20181204-132724823
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Official Citation:Nai-Chang Yeh, Chu-Cheng Fu, Ching-Tzu Chen, Z. Huang, Richard P. Vasquez, 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); doi: 10.1117/12.397825
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91476
Deposited By: George Porter
Deposited On:05 Dec 2018 15:46
Last Modified:16 Nov 2021 03:41

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