Anisotropic Enhancement of Superconductivity in Heavy-Ion Irradiated (K,Ba)BiO3

C. Marcenat; S. Blanchard; J. Marcus; L. M. Paulius; C. J. van der Beek; M. Konczykowski; T. Klein

doi:10.1103/PhysRevLett.90.037004

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Anisotropic Enhancement of Superconductivity in Heavy-Ion Irradiated (K,Ba)BiO3

C. Marcenat, S. Blanchard, J. Marcus, L. M. Paulius, C. J. van der Beek, M. Konczykowski, T. Klein

DOI 10.1103/PhysRevLett.90.037004 · Physical Review Letters

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Abstract

We have measured the specific heat, resistivity, and ac susceptibility of (K,Ba)BiO3 single crystals before and after introduction of either point or columnar defects by electron (EI) or heavy-ion irradiation (HII). While the magnetic field dependence of these properties remains mainly unaffected by EI, the irreversibility line and the location of the specific heat anomaly are both shifted up in temperature after HII. The shift is apparent only if the magnetic field is applied parallel to the ion tracks. For perpendicularly applied fields, both lines lie at the same field as in the pristine sample. These experiments call the nature of the vortex liquid state into question.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(K,Ba)BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31.5	Pressure not reported	unknown
(K,Ba)BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	31.3	Pressure not reported	unknown
(K,Ba)BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	29.2	Pressure not reported	unknown
(Nd,Ce)CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown