Energy gaps in the failed high-Tc superconductor La                         1.875                         Ba                          0.125                         CuO                         4

Rui Hua He; Kiyohisa Tanaka; Sung Kwan Mo; Takao Sasagawa; Masaki Fujita; Tadashi Adachi; Norman Mannella; Kazuyoshi Yamada; Yoji Koike; Zahid Hussain; Zhi Xun Shen

doi:10.1038/nphys1159

Energy gaps in the failed high-Tc superconductor La _1.875 Ba _0.125 CuO ₄

Rui Hua He, Kiyohisa Tanaka, Sung Kwan Mo, Takao Sasagawa, Masaki Fujita, Tadashi Adachi, Norman Mannella, Kazuyoshi Yamada, Yoji Koike, Zahid Hussain, Zhi Xun Shen

Materials Property Division

Research output: Contribution to journal › Article › peer-review

91 Citations (Scopus)

Abstract

A central issue in high-Tc superconductivity is the nature of the normal-state gap (pseudogap) in the underdoped regime and its relationship with superconductivity. Despite persistent efforts, theoretical ideas for the pseudogap evolve around fluctuating superconductivity, competing order and spectral weight suppression due to many-body effects. Recently, although some experiments in the superconducting state indicate a distinction between the superconducting gap and pseudogap , others in the normal state, either by extrapolation from high-temperature data or directly from La _1.875 Ba _0.125 CuO ₄ (LBCO-1/8) at low temperature, suggest the ground-state pseudogap is a single gap of d-wave form. Here, we report angle-resolved photoemission data from LBCO-1/8, collected with improved experimental conditions, that reveal the ground-state pseudogap has a pronounced deviation from the simple d-wave form. It contains two distinct components: a d-wave component within an extended region around the node and the other abruptly enhanced close to the antinode, pointing to a dual nature of the pseudogap in this failed high-Tc superconductor that involves a possible precursor-pairing energy scale around the node and another of different but unknown origin near the antinode.

Original language	English
Pages (from-to)	119-123
Number of pages	5
Journal	Nature Physics
Volume	5
Issue number	2
DOIs	https://doi.org/10.1038/nphys1159
Publication status	Published - 2009 Feb

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1038/nphys1159

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He, R. H., Tanaka, K., Mo, S. K., Sasagawa, T., Fujita, M., Adachi, T., Mannella, N., Yamada, K., Koike, Y., Hussain, Z., & Shen, Z. X. (2009). Energy gaps in the failed high-Tc superconductor La _1.875 Ba _0.125 CuO ₄ Nature Physics, 5(2), 119-123. https://doi.org/10.1038/nphys1159

Energy gaps in the failed high-Tc superconductor La _1.875 Ba _0.125 CuO ₄ . / He, Rui Hua; Tanaka, Kiyohisa; Mo, Sung Kwan et al.
In: Nature Physics, Vol. 5, No. 2, 02.2009, p. 119-123.

Research output: Contribution to journal › Article › peer-review

He, RH, Tanaka, K, Mo, SK, Sasagawa, T, Fujita, M, Adachi, T, Mannella, N, Yamada, K, Koike, Y, Hussain, Z & Shen, ZX 2009, ' Energy gaps in the failed high-Tc superconductor La _1.875 Ba _0.125 CuO ₄ ', Nature Physics, vol. 5, no. 2, pp. 119-123. https://doi.org/10.1038/nphys1159

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title = " Energy gaps in the failed high-Tc superconductor La 1.875 Ba 0.125 CuO 4 ",

abstract = " A central issue in high-Tc superconductivity is the nature of the normal-state gap (pseudogap) in the underdoped regime and its relationship with superconductivity. Despite persistent efforts, theoretical ideas for the pseudogap evolve around fluctuating superconductivity, competing order and spectral weight suppression due to many-body effects. Recently, although some experiments in the superconducting state indicate a distinction between the superconducting gap and pseudogap , others in the normal state, either by extrapolation from high-temperature data or directly from La 1.875 Ba 0.125 CuO 4 (LBCO-1/8) at low temperature, suggest the ground-state pseudogap is a single gap of d-wave form. Here, we report angle-resolved photoemission data from LBCO-1/8, collected with improved experimental conditions, that reveal the ground-state pseudogap has a pronounced deviation from the simple d-wave form. It contains two distinct components: a d-wave component within an extended region around the node and the other abruptly enhanced close to the antinode, pointing to a dual nature of the pseudogap in this failed high-Tc superconductor that involves a possible precursor-pairing energy scale around the node and another of different but unknown origin near the antinode. ",

author = "He, {Rui Hua} and Kiyohisa Tanaka and Mo, {Sung Kwan} and Takao Sasagawa and Masaki Fujita and Tadashi Adachi and Norman Mannella and Kazuyoshi Yamada and Yoji Koike and Zahid Hussain and Shen, {Zhi Xun}",

note = "Funding Information: The authors would like to acknowledge helpful discussions with H. Yao, W.-S. Lee, E. Berg, T. P. Devereaux, S. A. Kivelson, X. J. Zhou and T. Xiang and revision of the manuscript by R. G. Moore. R.-H.H. thanks G. Yu for kind assistance in the sample preparation and the SGF for financial support. The work at the ALS is supported by the DOE Office of Basic Energy Science under Contract No. DE-AC02-05CH11231. This work at Stanford is supported by the DOE Office of Science, Division of Materials Science and Engineering, under Contract No. DE-FG03-01ER45929-A001.",

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AU - He, Rui Hua

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AU - Sasagawa, Takao

AU - Fujita, Masaki

AU - Adachi, Tadashi

AU - Mannella, Norman

AU - Yamada, Kazuyoshi

AU - Koike, Yoji

AU - Hussain, Zahid

AU - Shen, Zhi Xun

N1 - Funding Information: The authors would like to acknowledge helpful discussions with H. Yao, W.-S. Lee, E. Berg, T. P. Devereaux, S. A. Kivelson, X. J. Zhou and T. Xiang and revision of the manuscript by R. G. Moore. R.-H.H. thanks G. Yu for kind assistance in the sample preparation and the SGF for financial support. The work at the ALS is supported by the DOE Office of Basic Energy Science under Contract No. DE-AC02-05CH11231. This work at Stanford is supported by the DOE Office of Science, Division of Materials Science and Engineering, under Contract No. DE-FG03-01ER45929-A001.

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N2 - A central issue in high-Tc superconductivity is the nature of the normal-state gap (pseudogap) in the underdoped regime and its relationship with superconductivity. Despite persistent efforts, theoretical ideas for the pseudogap evolve around fluctuating superconductivity, competing order and spectral weight suppression due to many-body effects. Recently, although some experiments in the superconducting state indicate a distinction between the superconducting gap and pseudogap , others in the normal state, either by extrapolation from high-temperature data or directly from La 1.875 Ba 0.125 CuO 4 (LBCO-1/8) at low temperature, suggest the ground-state pseudogap is a single gap of d-wave form. Here, we report angle-resolved photoemission data from LBCO-1/8, collected with improved experimental conditions, that reveal the ground-state pseudogap has a pronounced deviation from the simple d-wave form. It contains two distinct components: a d-wave component within an extended region around the node and the other abruptly enhanced close to the antinode, pointing to a dual nature of the pseudogap in this failed high-Tc superconductor that involves a possible precursor-pairing energy scale around the node and another of different but unknown origin near the antinode.

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Energy gaps in the failed high-Tc superconductor La _1.875 Ba _0.125 CuO ₄

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