High pressure effects revisited for the cuprate superconductor family with highest critical temperature

Ayako Yamamoto, Nao Takeshita, Chieko Terakura, Yoshinori Tokura

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

How to enhance the superconducting critical temperature (Tc) has been a primary issue since the discovery of superconductivity. The highest Tc reported so far is 166 K in HgBa2Ca2Cu3O8+δ (Hg1223) at high pressure of 23 GPa, as determined with the reduction onset, but not zero, of resistivity. To clarify the possible condition of the real maximum Tc, it is worth revisiting the effects of pressure on Tc in the highest Tc family. Here we report a systematic study of the pressure dependence of Tc in HgBa2CaCu2O6+δ (Hg1212) and Hg1223 with the doping level from underdoped to overdoped. The Tc with zero resistivity is probed with a cubic-anvil-type apparatus that can produce hydrostatic pressures. Variation, not only increase but also decrease, of Tc in Hg1212 and Hg1223 with pressure strongly depends on the initial doping levels. In particular, we confirm a maximum Tc of 153 K at 22 GPa in slightly underdoped Hg1223.

Original languageEnglish
Article number8990
JournalNature Communications
Volume6
DOIs
Publication statusPublished - 2015 Dec 1
Externally publishedYes

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High pressure effects
pressure effects
cuprates
critical temperature
electrical resistivity
anvils
hydrostatic pressure
pressure dependence
superconductivity
Doping (additives)
Temperature
Hydrostatic pressure
Superconductivity
Cuprate superconductors

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

High pressure effects revisited for the cuprate superconductor family with highest critical temperature. / Yamamoto, Ayako; Takeshita, Nao; Terakura, Chieko; Tokura, Yoshinori.

In: Nature Communications, Vol. 6, 8990, 01.12.2015.

Research output: Contribution to journalArticle

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