Evidence for chain superconductivity in near-stoichiometric YBa2Cu3Ox single crystals

V. Breit; P. Schweiss; R. Hauff; H. Wühl; H. Claus; H. Rietschel; A. Erb; G. Müller-Vogt

doi:10.1103/PhysRevB.52.R15727

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Evidence for chain superconductivity in near-stoichiometric YBa2Cu3Ox single crystals

V. Breit, P. Schweiss, R. Hauff, H. Wühl, H. Claus, H. Rietschel, A. Erb, G. Müller-Vogt

DOI 10.1103/PhysRevB.52.R15727 · Physical Review B

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Abstract

Specific-heat measurements on a high-quality, 63-mg YBa2Cu3Ox single crystal, in the range 6.94≤x≤7.0 (overdoped regime), are presented. The oxygen concentrations were determined independently by neutron scattering. It is observed that the mean-field value of the specific-heat jump at Tc increases by about 45% between 6.94 and 7.0. In contrast, Tc decreases by about 4%. It is also observed that the fluctuation contributions to the specific heat are greatly reduced near x=7.0. The observed behavior is attributed to induced superconductivity in the CuO chains.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91.2	Pressure not reported	midpoint
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91.4	Pressure not reported	midpoint
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89.7	Pressure not reported	midpoint
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89.4	Pressure not reported	midpoint
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	midpoint
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	87.8	Pressure not reported	midpoint
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	87.6	Pressure not reported	midpoint
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	87.5	Pressure not reported	midpoint
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y1-xCaxSr2Cu2Tl0.5Pb0.5O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2CuO6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown