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13 Feb 2012

Volume 100, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 100, 073501 (2012); http://dx.doi.org/10.1063/1.3682479 (3 pages)

S. Tongay, M. Lemaitre, J. Fridmann, A. F. Hebard, B. P. Gila, and B. R. Appleton
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Code-division multiplexing for x-ray microcalorimeters

G. M. Stiehl, W. B. Doriese, J. W. Fowler, G. C. Hilton, K. D. Irwin, C. D. Reintsema, D. R. Schmidt, D. S. Swetz, J. N. Ullom, and L. R. Vale

Appl. Phys. Lett. 100, 072601 (2012); http://dx.doi.org/10.1063/1.3684807 (3 pages) | Cited 2 times

Online Publication Date: 13 February 2012

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We demonstrate the code-division multiplexing (CDM) readout of eight transition-edge sensor microcalorimeters. The energy resolution is 3.0 eV (full width at half-maximum) or better at 5.9 keV, with a best resolution of 2.3 eV and a mean of 2.6 eV over the seven modulated detectors. The flux-summing CDM system is described and compared with similar time-division multiplexing (TDM) readout. We show that the math multiplexing disadvantage associated with TDM is not present in CDM. This demonstration establishes CDM as both a simple route to higher performance in existing TDM microcalorimetric experiments and a long-term approach to reaching higher multiplexing factors.
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07.85.-m X- and γ-ray instruments
29.40.-n Radiation detectors

Experimental realization of superconducting quantum interference devices with topological insulator junctions

M. Veldhorst, C. G. Molenaar, X. L. Wang, H. Hilgenkamp, and A. Brinkman

Appl. Phys. Lett. 100, 072602 (2012); http://dx.doi.org/10.1063/1.3686150 (3 pages) | Cited 14 times

Online Publication Date: 16 February 2012

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We demonstrate topological insulator (Bi2Te3) dc SQUIDs, based on superconducting Nb leads coupled to nano-fabricated Nb-Bi2Te3-Nb Josephson junctions. The high reproducibility and controllability of the fabrication process allow the creation of dc SQUIDs with parameters that are in agreement with design values. Clear critical current modulation of both the junctions and the SQUID with applied magnetic fields have been observed. We show that the SQUIDs have a periodicity in the voltage-flux characteristic of Φ0 of relevance to the ongoing pursuit of realizing interferometers for the detection of Majorana fermions in superconductor—topological insulator structures.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
74.25.Sv Critical currents
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)

Flux pinning and vortex transitions in doped BaFe2As2 single crystals

S. R. Ghorbani, X. L. Wang, M. Shabazi, S. X. Dou, K. Y. Choi, and C. T. Lin

Appl. Phys. Lett. 100, 072603 (2012); http://dx.doi.org/10.1063/1.3685507 (4 pages) | Cited 2 times

Online Publication Date: 17 February 2012

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The vortex liquid-to-glass transition has been studied in Ba0.72K0.28Fe2As2 (BaK-122), Ba(Fe0.91Co0.09)2As2(BaCo-122), and Ba(Fe0.95Ni0.05)2As2(BaNi-122) single crystal with superconducting transition temperature, Tc = 31.7, 17.3, and 18 K, respectively, by magnetoresistance measurements. For temperatures below Tc, the resistivity curves were measured in magnetic fields within the range of 0 ≤ B ≤ 13 T, and the pinning potential was scaled according to a modified model for vortex liquid resistivity. Good scaling of the resistivity ρ(B, T) and the effective pinning energy U0(B,T) were obtained. The vortex state is three-dimensional at temperatures lower than a characteristic temperature T*. The vortex phase diagram was determined based on the evolution of the vortex-glass transition temperature Tg with magnetic field and the upper critical field, Hc2. We found that non-magnetic K doping results in a high glass line close to the Hc2, while magnetic Ni and Co doping causes a low glass line which is far away from the Hc2. Our results suggest that non-magnetic induced disorder is more favourable for enhancement of pinning strength compared to magnetic induced disorder. Our results show that the pinning potential is responsible for the difference in the glass states.
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74.25.fc Electric and thermal conductivity
74.25.Wx Vortex pinning (includes mechanisms and flux creep)
74.25.Dw Superconductivity phase diagrams
74.70.Xa Pnictides and chalcogenides
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