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3 Sep 2012

Volume 101, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 101, 103101 (2012); http://dx.doi.org/10.1063/1.4748099 (5 pages)

Massimo Cuscunà, Annalisa Convertino, Emiliano Zampetti, Antonella Macagnano, Alessandro Pecora, Guglielmo Fortunato, Laura Felisari, Giuseppe Nicotra, Corrado Spinella, and Faustino Martelli
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Phase-controlled superconducting heat-flux quantum modulator

F. Giazotto and M. J. Martínez-Pérez

Appl. Phys. Lett. 101, 102601 (2012); http://dx.doi.org/10.1063/1.4750068 (4 pages) | Cited 5 times

Online Publication Date: 4 September 2012

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We theoretically put forward the concept of a phase-controlled superconducting heat-flux quantum modulator. Its operation relies on phase-dependent heat current predicted to occur in temperature-biased Josephson tunnel junctions. The device behavior is investigated as a function of temperature bias across the junctions, bath temperature, and junctions asymmetry as well. In a realistic Al-based setup the structure could provide temperature modulation amplitudes up to ∼ 50 mK with flux-to-temperature transfer coefficients exceeding ∼ 125 mK/Φ0 below 1 K, and temperature modulation frequency of the order of a few MHz. The proposed structure appears as a promising building-block for the implementation of caloritronic devices operating at cryogenic temperatures.
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85.25.Cp Josephson devices
84.30.Qi Modulators and demodulators; discriminators, comparators, mixers, limiters, and compressors

Alternating current loss of second-generation high-temperature superconducting coils with magnetic and non-magnetic substrate

Min Zhang, J. Kvitkovic, Jae-Ho. Kim, C. H. Kim, S. V. Pamidi, and T. A. Coombs

Appl. Phys. Lett. 101, 102602 (2012); http://dx.doi.org/10.1063/1.4749275 (4 pages) | Cited 1 time

Online Publication Date: 5 September 2012

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It is widely believed that the second-generation high-temperature superconducting (2G HTS) tapes with magnetic substrates suffer higher transport loss compared to those with non-magnetic substrates. To test this, we prepared two identical coils with magnetic and non-magnetic substrates, respectively. The experimental result was rather surprising that they generated roughly the same amount of transport loss. We used finite element method to understand this result. It is found that, unlike in the single tape where the magnetic field-dependent critical current characteristic can be neglected and the effect of magnetic substrate dominates, the magnetic field-dependent critical current characteristic of 2G tape plays as an equally important role as magnetic substrate in terms of HTS coils.
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84.71.Ba Superconducting magnets; magnetic levitation devices
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