Direct spectroscopic evidence for phase competition between the pseudogap and superconductivity in Bi2Sr2CaCu2O8+delta

Author List: Hashimoto, M (Hashimoto, Makoto)[ 1 ] ; Nowadnick, EA (Nowadnick, Elizabeth A.)[ 2,3,4,5 ] ; He, RH (He, Rui-Hua)[ 2,3,4,5,6 ] ; Vishik, IM (Vishik, Inna M.)[ 2,3,4,5 ] ; Moritz, B (Moritz, Brian)[ 2,7 ] ; He, Y (He, Yu)[ 2,3,4,5 ] ; Tanaka, K (Tanaka, Kiyohisa)[ 2,3,4,5,8 ] ; Moore, RG (Moore, Robert G.)[ 1,2 ] ; Lu, DH (Lu, Donghui)[ 1 ] ; Yoshida, Y (Yoshida, Yoshiyuki)[ 9 ] ; Ishikado, M (Ishikado, Motoyuki)[ 9,10 ] ; Sasagawa, T (Sasagawa, Takao)[ 11 ] ; Fujita, K (Fujita, Kazuhiro)[ 12,13 ] ; Ishida, S (Ishida, Shigeyuki)[ 12 ] ; Uchida, S (Uchida, Shinichi)[ 12 ] ; Eisaki, H (Eisaki, Hiroshi)[ 9 ] ; Hussain, Z (Hussain, Zahid)[ 6 ] ; Devereaux, TP (Devereaux, Thomas P.)[ 2,3 ] ; Shen, ZX (Shen, Zhi-Xun)[ 2,3,4,5 ]

Journal Reference: Nature Materials, Volume: 14, Issue: 1, Pages: 37-42, DOI: 10.1038/NMAT4116, Published: JAN 2015

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In the high-temperature (T-c) cuprate superconductors, a growing body of evidence suggests that the pseudogap phase(1), existing below the pseudogap temperature T*, is characterized by some broken electronic symmetries distinct from those associated with superconductivity(2-21). In particular, recent scattering experiments have suggested that charge ordering competes with superconductivity(18-21). However, no direct link of an interplay between the two phases has been identified from the important low-energy excitations. Here, we report an antagonistic singularity at T-c in the spectral weight of Bi2Sr2CaCu2O8+delta as compelling evidence for phase competition, which persists up to a high hole concentration p similar to 0.22. Comparison with theoretical calculations confirms that the singularity is a signature of competition between the order parameters for the pseudogap and superconductivity. The observation of the spectroscopic singularity at finite temperatures over a wide doping range provides new insights into the nature of the competitive interplay between the two orders and the complex phase diagram near the pseudogap critical point.

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