Local and global effects of quantum impurities on the quasi particle tunneling spectra of p-type and n-type cuprate superconductors

Nai-Chang Yeh; Ching-Tzu Chen; Richard P. Vasquez; Chang Uk Jung; J. Y. Kim; Min-Seok Park; Heon-Jung Kim; Sung-Ik Lee; K. Yoshida; Setsuko Tajima

doi:10.1117/12.452324

7 November 2002 Local and global effects of quantum impurities on the quasi-particle tunneling spectra of p-type and n-type cuprate superconductors

Nai-Chang Yeh, Ching-Tzu Chen, Richard P. Vasquez, Chang Uk Jung, J. Y. Kim, Min-Seok Park, Heon-Jung Kim, Sung-Ik Lee, K. Yoshida, Setsuko Tajima

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Proceedings Volume 4811, Superconducting and Related Oxides: Physics and Nanoengineering V; (2002) https://doi.org/10.1117/12.452324
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

We report scanning tunneling spectroscopic studies of the effects of quantum impurities on cuprate superconductors. The samples include p-type YBa₂Cu₃O_7-δ single crystals with spinless impurities of Zn²⁺ and Mg²⁺ ((Zn,Mg)-YBCO) and n-type infinite-layer system Sr_0.9La_0.1CuO₂ with 1% magnetic Ni²⁺- or 1% non-magnetic Zn²⁺-impurities that substitute the Cu²⁺ in the CuO₂ plane. The local effects of spinless impurities on the quasiparticles spectra of (Zn,Mg)-YBCO are analogous to those of Zn-substituted Bi₂Sr₂CaCu₂O_8+x, and the global effect is manifested by the suppression of the pairing potential Δd and of the spin excitation energy. In contrast, spectroscopic studies of Sr_0.9La_0.1CuO₂ reveal momentum-independent spectra and superconducting gap Δ , with (2Δ/k_BT_c) ~ 7 for T_c = 43 K and no pseudogap above T_c. The global response of Sr_0.9La_0.1CuO₂ to quantum impurities is similar to that of s-wave superconductors, being insensitive to small concentrations of spinless impurities (Zn) while showing rapid degradation in T_c with increasing magnetic impurities (Ni). Moreover, the spectra of the Ni-substituted Sr_0.9La_0.1CuO₂ reveal strong electron-hole asymmetry and long-range impurity effects, in contrast to the localized impurity effects in the p-type cuprates, and the introduction of Zn yield no reduction in either Δ or T_c. The physical implications of these findings are discussed.

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Nai-Chang Yeh, Ching-Tzu Chen, Richard P. Vasquez, Chang Uk Jung, J. Y. Kim, Min-Seok Park, Heon-Jung Kim, Sung-Ik Lee, K. Yoshida, and Setsuko Tajima "Local and global effects of quantum impurities on the quasi-particle tunneling spectra of p-type and n-type cuprate superconductors", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); https://doi.org/10.1117/12.452324

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KEYWORDS

Strontium

Superconductors

Lanthanum

Quasiparticles

Magnetism

Scattering

Copper

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