Superconductivity up to 164 K in HgBa2Cam−1CumO2m+2+δ (m=1, 2, and 3) under quasihydrostatic pressures

L. Gao; Y. Y. Xue; F. Chen; Q. Xiong; R. L. Meng; D. Ramirez; C. W. Chu; J. H. Eggert; H. K. Mao

doi:10.1103/PhysRevB.50.4260

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Superconductivity up to 164 K in HgBa2Cam−1CumO2m+2+δ (m=1, 2, and 3) under quasihydrostatic pressures

L. Gao, Y. Y. Xue, F. Chen, Q. Xiong, R. L. Meng, D. Ramirez, C. W. Chu, J. H. Eggert, H. K. Mao

DOI 10.1103/PhysRevB.50.4260 · Physical Review B

T1

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Abstract

The superconducting transition temperatures (Tc’s) of optimally doped HgBa2Cam−1CumO2m+2+δ (Hg 1:2:m-1:m) with m=1, 2, and 3 and Hg1−xPbxBa2Ca2Cu3O8+δ [Hg(xPb) 1:2:2:3] have been investigated resistively under quasihydrostatic pressures up to 45 GPa. There seems to be a universal upward shift of Tc under pressure, regardless of m, for all Hg 1:2:m-1:m, implying a common origin for all compounds. Record high Tc’s of 164, 154, and 118 K were reached for the optimally doped Hg 1:2:m-1:m with m=3, 2, and 1, respectively. However, the Tc enhancement is suppressed by Pb substitution, suggesting the possibility that Hg plays an important role in these compounds.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	97	Pressure unresolved	unknown
HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	128	Pressure unresolved	unknown
HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	135	Pressure unresolved	unknown
HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	164	31 GPa	onset
HgBa2CaCu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	154	29 GPa	onset
HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	118	24 GPa	onset
Hg0.9Pb0.1Ba2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	151	10 GPa	onset
Hg0.8Pb0.2Ba2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	145	8 GPa	onset