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

Ayako Yamamoto; Nao Takeshita; Chieko Terakura; Yoshinori Tokura

doi:10.1038/ncomms9990

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 journal › Article › peer-review

37 Citations (Scopus)

Abstract

How to enhance the superconducting critical temperature (T_c) has been a primary issue since the discovery of superconductivity. The highest T_c reported so far is 166 K in HgBa₂Ca₂Cu₃O_8+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 T_c, it is worth revisiting the effects of pressure on T_c in the highest T_c family. Here we report a systematic study of the pressure dependence of T_c in HgBa₂CaCu₂O_6+δ (Hg1212) and Hg1223 with the doping level from underdoped to overdoped. The T_c with zero resistivity is probed with a cubic-anvil-type apparatus that can produce hydrostatic pressures. Variation, not only increase but also decrease, of T_c in Hg1212 and Hg1223 with pressure strongly depends on the initial doping levels. In particular, we confirm a maximum T_c of 153 K at 22 GPa in slightly underdoped Hg1223.

Original language	English
Article number	8990
Journal	Nature Communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms9990
Publication status	Published - 2015 Dec 1
Externally published	Yes

ASJC Scopus subject areas

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

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10.1038/ncomms9990

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title = "High pressure effects revisited for the cuprate superconductor family with highest critical temperature",

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.",

author = "Ayako Yamamoto and Nao Takeshita and Chieko Terakura and Yoshinori Tokura",

note = "Funding Information: The authors thank Drs H. Eisaki, A. Iyo, M. Mito, Y. Nohara and R. Arita for fruitful discussions. This work was in part supported by Grants-in-Aid for Scientific Research (No. 23340110, No. 26289091) from the MEXT, Japan.",

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AU - Yamamoto, Ayako

AU - Takeshita, Nao

AU - Terakura, Chieko

AU - Tokura, Yoshinori

N1 - Funding Information: The authors thank Drs H. Eisaki, A. Iyo, M. Mito, Y. Nohara and R. Arita for fruitful discussions. This work was in part supported by Grants-in-Aid for Scientific Research (No. 23340110, No. 26289091) from the MEXT, Japan.

PY - 2015/12/1

Y1 - 2015/12/1

N2 - 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.

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