Improved high-Tc superconductors

R. N. Bhargava; S. P. Herko; W. N. Osborne

doi:10.1103/PhysRevLett.59.1468

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Improved high-Tc superconductors

R. N. Bhargava, S. P. Herko, W. N. Osborne

DOI 10.1103/PhysRevLett.59.1468 · Physical Review Letters

T1

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Abstract

We report an experimental observation of an increased Tc up to 159 K with temperature cycling in YBaCuO and YBaCuO:F samples. This increase in Tc is tentatively associated with a structural phase transition or ordering occurring at a well defined temperature close to 239 K. We have used the presence of this phase ordering to achieve improved-Tc material and tentatively attribute it to a two-dimensional to one-dimensional structural change.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	95	Pressure not reported	zero_resistance
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	160	Pressure not reported	unknown
YBaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	130	Pressure not reported	onset
YBaCuOF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	159	Pressure not reported	onset
YBaCuOF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	130	Pressure not reported	onset