Eliashberg analysis of the optical conductivity in superconducting Pr2CuOxwithx≃ 4

Schachinger, E.; Chanda, G.; Lobo, R. P. S. M.; Naito, Makio; Pronin, A. V.

doi:10.1088/0953-8984/27/4/045702

J. Phys.: Condens. Matter

2015

DOI: 10.1088/0953-8984/27/4/045702

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Eliashberg analysis of the optical conductivity in superconducting Pr₂CuO_xwithx≃ 4

E. Schachinger

G. Chanda

R. P. S. M. Lobo

et al.

Abstract: Superconducting Pr 2 CuO x , x 4 films with T structure and a T c of 27 K have been investigated by millimeter-wave transmission and broadband (infrared-to-ultraviolet) reflectivity measurements in the normal and superconducting state. The results obtained by both experimental methods show a consistent picture of the superconducting condensate formation below T c . An Eliashberg analysis of the data proves d-wave superconductivity and unitary-limit impurity scattering of the charge carriers below T c . The der… Show more

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“…8 Therefore, natures of the electronic state and superconductivity in undoped T'-Ln 2 CuO 4 have attracted great interest. Although several studies of the transport, magnetic and optical properties have been carried out using thin films of superconducting (SC) undoped T'-Ln 2 CuO 4 , [9][10][11][12][13][14][15] the pairing symmetry of the superconductivity has not yet been clarified.…”

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Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T′-La_1.8Eu_0.2CuO₄

et al. 2016

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We have investigated the effects of magnetic Ni and nonmagnetic Zn impurities on the superconductivity in undoped T'-La 1.8 Eu 0.2 CuO 4 (T'-LECO) with the Nd 2 CuO 4 -type structure, using the polycrystalline bulk samples, to clarify the pairing symmetry. It has been found that both suppression rates of the superconducting transition temperature T c by Ni and Zn impurities are nearly the same and are very similar to those in the optimally doped and overdoped regimes of hole-doped T-La 2−x Sr x CuO 4 with the K 2 NiF 4 -type structure. These results strongly suggest that the superconductivity in undoped T'-LECO is of the d-wave symmetry and is mediated by the spin fluctuation. * E-mail: tkawamata@teion.apph.tohoku.ac.jp J. Phys. Soc. Jpn. LETTERSIt has long been believed that the high-T c superconductivity appears through the hole and electron doping into the antiferromagnetic mother compound Ln 2 CuO 4 (Ln: lanthanide elements) with the K 2 NiF 4 -type (so-called T-type) and Nd 2 CuO 4 -type (so-called T'-type) structure, respectively. 1 In electron-doped T'-Ln 2−x Ce x CuO 4 , it has also been known that the reduction annealing of the as-grown samples to remove excess oxygen occupying the apical site just above Cu in the CuO 2 plane is necessary for the appearance of superconductivity at x 0.14. [2][3][4] Recently, in adequately reduced thin films of T'-Nd 2−x Ce x CuO 4 (T'-NCCO), however, superconductivity has been observed in a wide range of x and even in the undoped mother compound of x = 0. 5 Moreover, the superconductivity in undoped T'- The study of the effects of magnetic and nonmagnetic impurities on the superconductivity is useful to clarify the pairing symmetry of the superconductivity, because in a conventional s-wave superconductor, the SC transition temperature T c is suppressed by magnetic impurities more rapidly than by nonmagnetic impurities. In an unconventional superconductor with a sign-changing SC gap such as a d-wave superconductor, on the other hand, T c is rapidly suppressed by nonmagnetic impurities as well as by magnetic impurities. In fact, many studies of the impurity effect on T c have been carried out in high-T c cuprate superconductors. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] In hole-doped T-La 2−x Sr x CuO 4 (T-LSCO), the suppression of T c by nonmagnetic Zn is comparable or even slightly larger than the suppression by magentic Ni. 16-19, 22, 23, 27, 28 Such a tendency has also been observed in hole-doped Bi-2212 25, 29 and YBa 2 Cu 3 O 7 , 21,22,27 leading to the conclusion that the pairing symmetry of hole-doped high-T c cuprate superconductors is unconventional d-wave mediated by spin fluctuation. In electron-doped T'-NCCO, on the other hand, the T c suppression by Ni is much more rapid than by Zn. 18,20,24,32 In the electron- 20,23,30 respectively. It is found that both suppression rates of T c in T'-LECO by the Ni and Zn substitution are nearly the same. Surprisingly, this behavior is different from that of electron-doped T'-NCCO with x = 0.15 in...

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Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T′-La_1.8Eu_0.2CuO₄

et al. 2016

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Impurity Effects on the Electronic State in the Undoped (Ce-free) Superconductor T′-La_1.8Eu_0.2CuO₄ Studied by Muon Spin Relaxation

et al. 2018

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Eliashberg analysis of the optical conductivity in superconducting Pr₂CuO_xwithx≃ 4

Cited by 2 publications

References 42 publications

Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T′-La_1.8Eu_0.2CuO₄

Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T′-La_1.8Eu_0.2CuO₄

Impurity Effects on the Electronic State in the Undoped (Ce-free) Superconductor T′-La_1.8Eu_0.2CuO₄ Studied by Muon Spin Relaxation

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Eliashberg analysis of the optical conductivity in superconducting Pr2CuOxwithx≃ 4

Cited by 2 publications

References 42 publications

Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T′-La1.8Eu0.2CuO4

Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T′-La1.8Eu0.2CuO4

Impurity Effects on the Electronic State in the Undoped (Ce-free) Superconductor T′-La1.8Eu0.2CuO4 Studied by Muon Spin Relaxation

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Eliashberg analysis of the optical conductivity in superconducting Pr₂CuO_xwithx≃ 4

Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T′-La_1.8Eu_0.2CuO₄

Pairing Symmetry Studied from Impurity Effects in the Undoped Superconductor T′-La_1.8Eu_0.2CuO₄

Impurity Effects on the Electronic State in the Undoped (Ce-free) Superconductor T′-La_1.8Eu_0.2CuO₄ Studied by Muon Spin Relaxation