Author: ["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"]
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Abstract
ARPES measurements of the ‘failed’ superconductor LBCO-1/8 suggest that its pseudogap phase consists of two distinct components. The result could be an important clue into the nature of this phase in the copper oxide superconductors. A central issue in high-Tc superconductivity is the nature of the normal-state gap (pseudogap)1 in the underdoped regime and its relationship with superconductivity. Despite persistent efforts, theoretical ideas for the pseudogap evolve around fluctuating superconductivity2, competing order3,4,5,6,7,8 and spectral weight suppression due to many-body effects9. Recently, although some experiments in the superconducting state indicate a distinction between the superconducting gap and pseudogap 10,11,12,13,14, others in the normal state, either by extrapolation from high-temperature data15 or directly from La1.875Ba0.125CuO4 (LBCO-1/8) at low temperature16, suggest the ground-state pseudogap is a single gap of d-wave17 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.Cite this article
He, RH., Tanaka, K., Mo, SK. et al. Energy gaps in the failed high-Tc superconductor La1.875Ba0.125CuO4. Nature Phys 5, 119–123 (2009). https://doi.org/10.1038/nphys1159 