# Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors

Title | Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors |

Publication Type | Journal Article |

Year of Publication | 2010 |

Authors | Sadleir JE, Smith SJ, Bandler SR, Chervenak JA, Clem JR |

Journal Title | Physical Review Letters |

Volume | 104 |

Pages | 047003 |

Date Published | 01/29 |

ISBN Number | 0031-9007 |

Accession Number | ISI:000274336600045 |

Keywords | detectors, noise, sandwiches, supercurrents, x-ray microcalorimeters |

Abstract | We have found experimentally that the critical current of a square thin-film superconducting transition-edge sensor (TES) depends exponentially upon the side length L and the square root of the temperature T, a behavior that has a natural theoretical explanation in terms of longitudinal proximity effects if the TES is regarded as a weak link between superconducting leads. As a consequence, the effective transition temperature T-c of the TES is current dependent and at fixed current scales as 1/L-2. We have also found that the critical current can show clear Fraunhofer-like oscillations in an applied magnetic field, similar to those found in Josephson junctions. We have observed the longitudinal proximity effect in these devices over extraordinarily long lengths up to 290 mu m, 1450 times the mean-free path. |

URL | <Go to ISI>://000274336600045 |

DOI | Doi 10.1103/Physrevlett.104.047003 |