Doping dependencies of onset temperatures for the pseudogap and superconductive fluctuation in Bi2Sr2CaCu2O8+δ, studied from both in-plane and out-of-plane magnetoresistance measurements

Tomohiro Usui, Daiki Fujiwara, Shintaro Adachi, Hironobu Kudo, Kosuke Murata, Haruki Kushibiki, Takao Watanabe, Kazutaka Kudo, Terukazu Nishizaki, Norio Kobayashi, Shojiro Kimura, Kazuyoshi Yamada, Tomoyuki Naito, Takashi Noji, Yoji Koike

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Abstract

To investigate the relationship between the pseudogap and superconductivity, we measured both the in-plane (ρab) and out-of-plane (ρc) resistivity for oxygen-controlled Bi2Sr2CaCu2O8+δ single crystals subject to magnetic fields (parallel to the c-axis) of up to 17.5 T. The onset temperature for the superconductive fluctuation, Tscf, is determined by the large positive in-plane magnetoresistance (MR) and negative out-of-plane MR observed near Tc, whereas the pseudogap opening temperature T is determined by the semiconductive upturn of the zero-field ρc. Tscf was found to scale roughly as Tc, with a decreasing temperature interval between them upon doping. On the other hand, T starts out much higher than Tscf but decreases monotonically upon doping; finally, at a heavily overdoped state, it is not observed above Tscf. These results imply that the pseudogap is not a simple precursor of superconductivity, but that further study is needed to determine whether or not T exists below Tscf in the heavily overdoped state.

Original languageEnglish
Article number064713
Journaljournal of the physical society of japan
Volume83
Issue number6
DOIs
Publication statusPublished - Jun 15 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Usui, T., Fujiwara, D., Adachi, S., Kudo, H., Murata, K., Kushibiki, H., Watanabe, T., Kudo, K., Nishizaki, T., Kobayashi, N., Kimura, S., Yamada, K., Naito, T., Noji, T., & Koike, Y. (2014). Doping dependencies of onset temperatures for the pseudogap and superconductive fluctuation in Bi2Sr2CaCu2O8+δ, studied from both in-plane and out-of-plane magnetoresistance measurements. journal of the physical society of japan, 83(6), [064713]. https://doi.org/10.7566/JPSJ.83.064713