Discrete superconducting transition temperatures and pronounced Tc depression related to the 18 problem in Bi2Sr2−xLaxCuO6+δ single crystals

W. L. Yang; H. H. Wen; Z. X. Zhao

doi:10.1103/PhysRevB.62.1361

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Discrete superconducting transition temperatures and pronounced Tc depression related to the 18 problem in Bi2Sr2−xLaxCuO6+δ single crystals

W. L. Yang, H. H. Wen, Z. X. Zhao

DOI 10.1103/PhysRevB.62.1361 · Physical Review B

T1

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Abstract

Superconducting transition temperatures are measured on a series of Bi2Sr2−xLaxCuO6+δ single crystals (totally 36 pieces). It is found that the correlation between Tc and the doping level evolved from a continuous parabola to discontinuous steps after oxidizing the crystals. In addition, a Tc depression is observed in this system at a hole concentration per Cu atom of about 18 as confirmed by thermoelectric power measurements. Together with the nonparabolic Tc behavior in other superconducting systems, we argue that, in the electronic phase diagram for high-temperature superconductors, there may be two kinds of Tc dependence upon hole concentration: parabolic and steplike, caused by immobile and mobile dopants, respectively.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2-xLaxCuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	onset
La2-xMxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl0.5-xPb0.5-xCa1-xYxSr2Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y0.8Ca0.2Ba2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LaBa1.5Ca0.5Cu3Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1.6-xNd0.4SrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown