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Horio M, Krockenberger Y, Yamamoto K, Yokoyama Y, Takubo K, Hirata Y, Sakamoto S, Koshiishi K, Yasui A, Ikenaga E, Shin S, Yamamoto H, Wadati H, Fujimori A. Electronic Structure of Ce-Doped and -Undoped Nd_{2}CuO_{4} Superconducting Thin Films Studied by Hard X-Ray Photoemission and Soft X-Ray Absorption Spectroscopy. PHYSICAL REVIEW LETTERS 2018; 120:257001. [PMID: 29979072 DOI: 10.1103/physrevlett.120.257001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Indexed: 06/08/2023]
Abstract
In order to realize superconductivity in cuprates with the T^{'}-type structure, not only chemical substitution (Ce doping) but also postgrowth reduction annealing is necessary. In the case of thin films, however, well-designed reduction annealing alone without Ce doping can induce superconductivity in the T^{'}-type cuprates. In order to unveil the origin of superconductivity in the Ce-undoped T^{'}-type cuprates, we have performed bulk-sensitive hard x-ray photoemission and soft x-ray absorption spectroscopy on superconducting and nonsuperconducting Nd_{2-x}Ce_{x}CuO_{4} (x=0, 0.15, and 0.19) thin films. By postgrowth annealing, core-level spectra exhibited dramatic changes, which we attributed to the enhancement of core-hole screening in the CuO_{2} plane and the shift of chemical potential along with changes in the band filling. The result suggests that the superconducting Nd_{2}CuO_{4} film is doped with electrons despite the absence of the Ce substitution.
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Affiliation(s)
- M Horio
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Y Krockenberger
- NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
| | - K Yamamoto
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Y Yokoyama
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - K Takubo
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - Y Hirata
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - S Sakamoto
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - K Koshiishi
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - A Yasui
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - E Ikenaga
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - S Shin
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - H Yamamoto
- NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
| | - H Wadati
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - A Fujimori
- Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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Chen J, Liu R, Liu R, Lin H, Uen T, Juang J, Gou Y. Charge transfer process in Tl2Ba2Ca2Cu3O10 and Tl2Ba2CaCu2O8 thin films probed by polarized X-ray absorption spectroscopy. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(97)00845-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Liang G, Guo Y, Badresingh D, Xu W, Tang Y, Croft M, Chen J, Sahiner A, O B, Markert JT. X-ray-absorption studies of electron doping and band shifts in R2-xCexCuO4- delta (R=Pr, Nd, Sm, Eu, and Gd). PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:1258-1269. [PMID: 9978282 DOI: 10.1103/physrevb.51.1258] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Anderson RO, Claessen R, Allen JW, Olson CG, Janowitz C, Liu LZ, Park J, Maple MB, Dalichaouch Y, Jardim RF, Early EA, Oh S, Ellis WP. Luttinger Fermi surface of metallic gap spectral weight in Nd1.85Ce0.15CuO4-y. PHYSICAL REVIEW LETTERS 1993; 70:3163-3166. [PMID: 10053791 DOI: 10.1103/physrevlett.70.3163] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Pellegrin E, Nücker N, Fink J, Molodtsov SL, Gutiérrez A, Navas E, Strebel O, Hu Z, Domke M, Kaindl G, Uchida S, Nakamura Y, Markl J, Klauda M, Saemann-Ischenko G, Krol A, Peng JL, Li ZY, Greene RL. Orbital character of states at the Fermi level in La2-xSrxCuO4 and R2-xCexCuO4 (R=Nd,Sm). PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:3354-3367. [PMID: 10006422 DOI: 10.1103/physrevb.47.3354] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Early EA, Almasan CC, Jardim RF, Maple MB. Double resistive superconducting transition in Sm2-xCexCuO4-y. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 47:433-441. [PMID: 10004460 DOI: 10.1103/physrevb.47.433] [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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Krol A, Lin CS, Soo YL, Ming ZH, Kao YH, Wang JH, Qi M, Smith GC. Soft-x-ray-absorption studies of Tl2Ba2Ca2Cu3O10- delta high-Tc superconductors. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:10051-10056. [PMID: 10000893 DOI: 10.1103/physrevb.45.10051] [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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Hybertsen MS, Stechel EB, Foulkes WM, Schlüter M. Model for low-energy electronic states probed by x-ray absorption in high-Tc cuprates. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:10032-10050. [PMID: 10000892 DOI: 10.1103/physrevb.45.10032] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Bianconi A, Li C, Longa SD, Pompa M. Electronic structure of Bi2CaSr2Cu2O8 determined by a combined analysis of various polarized x-ray-absorption spectra. PHYSICAL REVIEW. B, CONDENSED MATTER 1992; 45:4989-5000. [PMID: 10002142 DOI: 10.1103/physrevb.45.4989] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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