Generic phase diagram of “electron-doped” T′ cuprates

Matsumoto, Osamu; Utsuki, Aya; Tsukada, A.; Yamamoto, Hideki; Manabe, Takaaki; Naito, Makio

doi:10.1016/j.physc.2009.05.100

Cited by 77 publications

(41 citation statements)

References 18 publications

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“…annealed thin single crystals of Pr 2− x Ce x CuO 4 sandwiched by Pr 2− x Ce x CuO 4 polycrystals of the same compositions and realized superconductivity with Ce concentration as low as 4%. Recently, in thin films2122 and powdered samples2324 of e-HTSCs, superconductivity was found even without Ce doping. Inspired by those studies, Adachi et al 25.…”

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Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

et al. 2016

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In the hole-doped cuprates, a small number of carriers suppresses antiferromagnetism and induces superconductivity. In the electron-doped cuprates, on the other hand, superconductivity appears only in a narrow window of high-doped Ce concentration after reduction annealing, and strong antiferromagnetic correlation persists in the superconducting phase. Recently, Pr1.3−xLa0.7CexCuO4 (PLCCO) bulk single crystals annealed by a protect annealing method showed a high critical temperature of around 27 K for small Ce content down to 0.05. Here, by angle-resolved photoemission spectroscopy measurements of PLCCO crystals, we observed a sharp quasi-particle peak on the entire Fermi surface without signature of an antiferromagnetic pseudogap unlike all the previous work, indicating a dramatic reduction of antiferromagnetic correlation length and/or of magnetic moments. The superconducting state was found to extend over a wide electron concentration range. The present results fundamentally challenge the long-standing picture on the electronic structure in the electron-doped regime.

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Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

et al. 2016

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“…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.…”

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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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“…3) Recently, Matsumoto et al have reported a surprising result that properly reduced thin films of NCCO show superconductivity in a wide range of x even at x = 0. 4) Formerly, Brinkmann et al have observed superconductivity even in the underdoped regime of x ≥ 0.04 in Pr 2−x Ce x CuO 4 (PCCO) through the improved reduction annealing. 5) Obviously, these observations of superconductivity in the extremely underdoped regime are unable to be explained in terms of carrier doping into a parent compound of a Mott insulator as in the case of the hole-doped cuprates, being in sharp contrast to the common understanding of the well-known phase diagram of * E-mail: t-adachi@sophia.ac.…”

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Evolution of the Electronic State through the Reduction Annealing in Electron-Doped Pr_1.3-xLa_0.7Ce_xCuO_4+δ(x=0.10) Single Crystals: Antiferromagnetism, Kondo Effect, and Superconductivity

et al. 2013

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Generic phase diagram of “electron-doped” T′ cuprates

Cited by 77 publications

References 18 publications

Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

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

Evolution of the Electronic State through the Reduction Annealing in Electron-Doped Pr_1.3-xLa_0.7Ce_xCuO_4+δ(x=0.10) Single Crystals: Antiferromagnetism, Kondo Effect, and Superconductivity

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Generic phase diagram of “electron-doped” T′ cuprates

Cited by 77 publications

References 18 publications

Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

Suppression of the antiferromagnetic pseudogap in the electron-doped high-temperature superconductor by protect annealing

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

Evolution of the Electronic State through the Reduction Annealing in Electron-Doped Pr1.3-xLa0.7CexCuO4+δ(x=0.10) Single Crystals: Antiferromagnetism, Kondo Effect, and Superconductivity

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

Evolution of the Electronic State through the Reduction Annealing in Electron-Doped Pr_1.3-xLa_0.7Ce_xCuO_4+δ(x=0.10) Single Crystals: Antiferromagnetism, Kondo Effect, and Superconductivity