A new instrument to measure the surface resistance of superconducting samples at 400 MHz | Zendy

E. Mahner | Zendy; S. Calatroni | Zendy; E. Chiaveri | Zendy; E. Haebel | Zendy; J. M. Tessier | Zendy

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A new instrument to measure the surface resistance of superconducting samples at 400 MHz

Author(s) -

E. Mahner,

S. Calatroni,

E. Chiaveri,

E. Haebel,

J. M. Tessier

Publication year - 2003

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.1578157

Subject(s) - niobium , materials science , superconductivity , resonator , sheet resistance , analytical chemistry (journal) , niobium tin , electrical resistivity and conductivity , condensed matter physics , superconducting magnet , optoelectronics , physics , composite material , chemistry , metallurgy , layer (electronics) , chromatography , quantum mechanics

A 400-MHz niobium quadrupole resonator has been manufactured to study the rf properties of superconducting bulk and thin film samples at low temperatures. We describe the apparatus, i.e. the construction of the resonator, field calculations with MAFIA, and the experimental procedure. In first validation tests the surface resistance Rs of a reactor-grade bulk niobium sample as a function of temperature and applied rf field has been investigated by using a calorimetric "rf-dc-compensation" method. A critical temperature Tc = 9.15 Â± 0.02 K, a thermal conductivity λ (4.2 K) = 6.9 Â± 0.7 W/mK, a residual resistance Rres = 19.0 Â± 0.3 nΩ and a superconducting energy gap of ∆/kBTc = 1.82 Â± 0.01 have been measured. At 4.2 K we achieved a calorimetric detection limit for Rs of 0.16 nΩ at a peak field of 25 mT

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