Electrical and magnetic transport properties of laser-deposited Ba 1-xKxBiO3 thin films

R. A. Schweinfurth; C. E. Platt; M. R. Teepe; D. J. Van Harlingen

doi:10.1063/1.107863

Electrical and magnetic transport properties of laser-deposited Ba _1-xK_xBiO₃ thin films

R. A. Schweinfurth, C. E. Platt, M. R. Teepe, D. J. Van Harlingen

Physics

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Abstract

We report measurements of the electrical and magnetic transport properties of high-quality superconducting Ba_1-xK_xBiO₃ (BKBO) thin films grown by in situ pulsed laser deposition. The best films exhibit sharp resistance and magnetic transitions with zero resistance above 28 K and widths of 0.3 K, and nearly linear normal state resistance extending from the transition to above room temperature. Critical current densities obtained by transport in patterned BKBO lines are greater than 3×10⁶ A/cm² at 4 K. The transverse magnetoresistance exhibits predominantly BCS-like behavior with an upper critical field slope of -0.78 T/K near T _c, giving H_c2(0)=15.2 T and a BCS coherence length =46 Å. We also observe substantial field broadening suggestive of flux flow dissipation.

Original language	English (US)
Pages (from-to)	480-482
Number of pages	3
Journal	Applied Physics Letters
Volume	61
Issue number	4
DOIs	https://doi.org/10.1063/1.107863
State	Published - 1992

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Electrical and magnetic transport properties of laser-deposited Ba 1-xKxBiO3 thin films",

abstract = "We report measurements of the electrical and magnetic transport properties of high-quality superconducting Ba1-xKxBiO3 (BKBO) thin films grown by in situ pulsed laser deposition. The best films exhibit sharp resistance and magnetic transitions with zero resistance above 28 K and widths of 0.3 K, and nearly linear normal state resistance extending from the transition to above room temperature. Critical current densities obtained by transport in patterned BKBO lines are greater than 3×106 A/cm2 at 4 K. The transverse magnetoresistance exhibits predominantly BCS-like behavior with an upper critical field slope of -0.78 T/K near T c, giving Hc2(0)=15.2 T and a BCS coherence length =46 {\AA}. We also observe substantial field broadening suggestive of flux flow dissipation.",

author = "Schweinfurth, {R. A.} and Platt, {C. E.} and Teepe, {M. R.} and {Van Harlingen}, {D. J.}",

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pages = "480--482",

journal = "Applied Physics Letters",

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T1 - Electrical and magnetic transport properties of laser-deposited Ba 1-xKxBiO3 thin films

AU - Schweinfurth, R. A.

AU - Platt, C. E.

AU - Teepe, M. R.

AU - Van Harlingen, D. J.

PY - 1992

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N2 - We report measurements of the electrical and magnetic transport properties of high-quality superconducting Ba1-xKxBiO3 (BKBO) thin films grown by in situ pulsed laser deposition. The best films exhibit sharp resistance and magnetic transitions with zero resistance above 28 K and widths of 0.3 K, and nearly linear normal state resistance extending from the transition to above room temperature. Critical current densities obtained by transport in patterned BKBO lines are greater than 3×106 A/cm2 at 4 K. The transverse magnetoresistance exhibits predominantly BCS-like behavior with an upper critical field slope of -0.78 T/K near T c, giving Hc2(0)=15.2 T and a BCS coherence length =46 Å. We also observe substantial field broadening suggestive of flux flow dissipation.

AB - We report measurements of the electrical and magnetic transport properties of high-quality superconducting Ba1-xKxBiO3 (BKBO) thin films grown by in situ pulsed laser deposition. The best films exhibit sharp resistance and magnetic transitions with zero resistance above 28 K and widths of 0.3 K, and nearly linear normal state resistance extending from the transition to above room temperature. Critical current densities obtained by transport in patterned BKBO lines are greater than 3×106 A/cm2 at 4 K. The transverse magnetoresistance exhibits predominantly BCS-like behavior with an upper critical field slope of -0.78 T/K near T c, giving Hc2(0)=15.2 T and a BCS coherence length =46 Å. We also observe substantial field broadening suggestive of flux flow dissipation.

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