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Horio M, Fujimori A. ARPES studies on new types of electron-doped cuprate superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:503001. [PMID: 30468154 DOI: 10.1088/1361-648x/aab824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
For more than thirty years since the discovery of superconductivity in cuprates, it has been widely agreed that the superconductivity is realized by doping a charge-transfer insulator with charge carriers through chemical substitution. For electron-doped cuprates, however, the recent development of reduction annealing methods has enabled superconductivity for a very small amount of or even without chemical substitution. In this article, we review recent angle-resolved photoemission spectroscopy studies on the new types of electron-doped cuprates with particular emphasis on the effect of reduction annealing. The presented results provide us with renewed insight into the phase diagram and the nature of the pseudogap not only on the electron-doped side but also in the entire doping range including hole doping.
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Affiliation(s)
- M Horio
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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Emerging superconductivity hidden beneath charge-transfer insulators. Sci Rep 2014; 3:2235. [PMID: 23887134 PMCID: PMC3724181 DOI: 10.1038/srep02235] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Accepted: 07/01/2013] [Indexed: 11/23/2022] Open
Abstract
In many of today's most interesting materials, strong interactions prevail upon the magnetic moments, the electrons, and the crystal lattice, forming strong links between these different aspects of the system. Particularly, in two-dimensional cuprates, where copper is either five- or six-fold coordinated, superconductivity is commonly induced by chemical doping which is deemed to be mandatory by destruction of long-range antiferromagnetic order of 3d9 Cu2+ moments. Here we show that superconductivity can be induced in Pr2CuO4, where copper is four-fold coordinated. We induced this novel quantum state of Pr2CuO4 by realizing pristine square-planar coordinated copper in the copper-oxygen planes, thus, resulting in critical superconducting temperatures even higher than by chemical doping. Our results demonstrate new degrees of freedom, i.e., coordination of copper, for the manipulation of magnetic and superconducting order parameters in quantum materials.
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Remarkable transition from rocksalt/perovskite layered structure to fluorite/rocksalt layered structure in rapidly cooled Ln₂CuO₄. Sci Rep 2013; 3:1504. [PMID: 23514849 PMCID: PMC3604706 DOI: 10.1038/srep01504] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 03/06/2013] [Indexed: 11/08/2022] Open
Abstract
Lanthanide cuprates of formula Ln₂CuO₄ exist in two principal forms, T and T' which are renowned for their exhibition at low temperatures of hole and electronic types of superconductivity, respectively. These structures differ primarily in the arrangement of oxygen between the perovskite layers and also in nature of the copper oxygen planes. The Cu-O distance in the T structure (~1.90 Å) is much shorter than the T' (1.97Å), reflecting a transition between partial Cu⁺and partial Cu³⁺ character. In seeking to find compositions that bridge these two structure/electron carrier types, we observed the transition from a T structure to a T' type structure, resulting in the metastable form T″ with slightly larger volume but similar character to T'. This transition from T to T″ is associated with 5% increase in a and a 5% decrease in c parameters of the tetragonal unit cells, which results in disintegration of ceramic bodies.
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Conditions for superconductivity in the electron-doped copper-oxide system, (Nd1−xCex)2CuO4+δ. J SOLID STATE CHEM 2008. [DOI: 10.1016/j.jssc.2007.11.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Richard P, Neupane M, Xu YM, Fournier P, Li S, Dai P, Wang Z, Ding H. Competition between antiferromagnetism and superconductivity in the electron-doped cuprates triggered by oxygen reduction. PHYSICAL REVIEW LETTERS 2007; 99:157002. [PMID: 17995205 DOI: 10.1103/physrevlett.99.157002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Indexed: 05/25/2023]
Abstract
We have performed a systematic angle-resolved photoemission study of as-grown and oxygen-reduced Pr(2-x)CexCuO4 and Pr(1-x)LaCexCuO4 electron-doped cuprates. In contrast with the common belief, neither the band filling nor the band parameters are significantly affected by the oxygen reduction process. Instead, we show that the main electronic role of the reduction process is to remove an anisotropic leading edge gap around the Fermi surface. While the nodal leading edge gap is induced by long-range antiferomagnetic order, the origin of the antinodal one remains unclear.
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Affiliation(s)
- P Richard
- Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
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Chen XH, Ruan KQ, Feng Y, Wang CY, Cao LZ, Jia YB, Zhang YH. Transport properties in the calcium-doped Nd-Ce-Cu-O system. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:13306-13310. [PMID: 9985194 DOI: 10.1103/physrevb.54.13306] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Jandl S, Dufour P, Strach T, Ruf T, Cardona M, Nekvasil V, Chen C, Wanklyn BM. Raman study of intermultiplet crystal-field excitations in Nd2CuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:15558-15564. [PMID: 9980915 DOI: 10.1103/physrevb.52.15558] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Jardim RF, Ben-Dor L, Stroud D, Maple MB. Granular behavior in polycrystalline Sm2-xCexCuO4-y compounds. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:10080-10087. [PMID: 9975091 DOI: 10.1103/physrevb.50.10080] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zhu YT, Manthiram A. Role of bond-length mismatch in L2-xCexCuO4 (L=lanthanide). PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:6293-6298. [PMID: 10011616 DOI: 10.1103/physrevb.49.6293] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Sawatzky GA. Intersite interactions in Cu L-edge XPS, XAS, and XES of doped and undoped Cu compounds. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:3473-3482. [PMID: 10011211 DOI: 10.1103/physrevb.49.3473] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Belapurkar D, Gupta N, Phatak G, Iyer R. Role of oxygen vacancies in the decomposition of N2O over YBa2Cu3O7−δ and Gd2CuO4 oxide systems. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0304-5102(93)e0222-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Jiang W, Peng JL, Li ZY, Greene RL. Transport properties of Nd1.85Ce0.15CuO4+ delta crystals before and after reduction. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:8151-8155. [PMID: 10004827 DOI: 10.1103/physrevb.47.8151] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Butorin SM, Galakhov VR, Kurmaev EZ, Cheshnitsky SM, Lebedev SA, Kukovitzkii EF. Effects of Ce and F doping and reduction on the electronic structure of Nd2-xCexCuO4 and Nd2CuO3.6F0.4 as determined by x-ray-emission spectroscopy. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:9035-9041. [PMID: 10004953 DOI: 10.1103/physrevb.47.9035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Matsuda M, Endoh Y, Yamada K, Kojima H, Tanaka I, Birgeneau RJ, Kastner MA, Shirane G. Magnetic order, spin correlations, and superconductivity in single-crystal Nd1.85Ce0.15CuO4+ delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:12548-12555. [PMID: 10001295 DOI: 10.1103/physrevb.45.12548] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Jardim RF, Westphal CH, Becerra CC, Paduan-Filho A. Spin-flop phase and effect of Ce4+ and Nd3+ doping in Gd2CuO4. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:10485-10489. [PMID: 10000953 DOI: 10.1103/physrevb.45.10485] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Jiang B, O B, Markert JT. Electronic, steric, and dilution effects on the magnetic properties of Sm2-xMxCuO4-y (M=Ce, Y, La, and Sr): Implications for magnetic pair breaking. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:2311-2318. [PMID: 10001753 DOI: 10.1103/physrevb.45.2311] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Tan Z, Budnick JI, Luo S, Chen WQ, Cheong SW, Cooper AS, Canfield PC, Fisk Z. X-ray-absorption studies of cation ordering and valence in the T*-phase La2-x-yRxSryCuO4 (R=Sm, Eu, Gd, Tb, and Dy). PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 44:7008-7017. [PMID: 9998585 DOI: 10.1103/physrevb.44.7008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Fortune NA, Murata K, Ishibashi M, Yokoyama Y, Nishihara Y. Systematic variation of transport and thermodynamic properties with degree of reduction in Nd1.85Ce0.15CuO4- delta. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:12930-12934. [PMID: 9997110 DOI: 10.1103/physrevb.43.12930] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Remschnig K, Tarascon JM, Miceli PF, Hull GW, McKinnon WR. Magnetism and superconductivity in 3d-metal-substituted Bi-based cuprates having the 2:2:0:1 structure. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:5481-5488. [PMID: 9997946 DOI: 10.1103/physrevb.43.5481] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Oyanagi H, Yokoyama Y, Yamaguchi H, Kuwahara Y, Katayama T, Nishihara Y. Role of oxygen in superconductivity of Nd2-xCexCuO4-y studied by x-ray-absorption near-edge structure. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:10136-10140. [PMID: 9995269 DOI: 10.1103/physrevb.42.10136] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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The influence of oxygen activity on T, T′, and phase stabilities in (La,RE)2CuO4 systems. J SOLID STATE CHEM 1990. [DOI: 10.1016/0022-4596(90)90260-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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