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15 Oct 2012

Volume 101, Issue 16, Articles (16xxxx)

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Appl. Phys. Lett. 101, 161105 (2012); http://dx.doi.org/10.1063/1.4744947 (4 pages)

Nan Niu, Tsung-Li Liu, Igor Aharonovich, Kasey J. Russell, Alexander Woolf, Thomas C. Sadler, Haitham A. R. El-Ella, Menno J. Kappers, Rachel A. Oliver, and Evelyn L. Hu
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An ultra-fast superconducting Nb nanowire single-photon detector for soft x-rays

K. Inderbitzin, A. Engel, A. Schilling, K. Il'in, and M. Siegel

Appl. Phys. Lett. 101, 162601 (2012); http://dx.doi.org/10.1063/1.4759046 (5 pages)

Online Publication Date: 15 October 2012

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Although superconducting nanowire single-photon detectors (SNSPDs) are well studied regarding the detection of infrared/optical photons and keV-molecules, no studies on continuous x-ray photon counting by thick-film detectors have been reported so far. We fabricated a 100 nm thick niobium x-ray SNSPD (an X-SNSPD) and studied its detection capability of photons with keV-energies in continuous mode. The detector is capable to detect photons even at reduced bias currents of 0.4%, which is in sharp contrast to optical thin-film SNSPDs. No dark counts were recorded in extended measurement periods. Strikingly, the signal amplitude distribution depends significantly on the photon energy spectrum.
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85.25.Oj Superconducting optical, X-ray, and γ-ray detectors (SIS, NIS, transition edge)
07.85.Fv X- and γ-ray sources, mirrors, gratings, and detectors
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
85.60.Gz Photodetectors (including infrared and CCD detectors)

Superconducting epitaxial thin films of CeNixBi2 with a bismuth square net structure

Alexander Buckow, Katharina Kupka, Reiner Retzlaff, Jose Kurian, and Lambert Alff

Appl. Phys. Lett. 101, 162602 (2012); http://dx.doi.org/10.1063/1.4760264 (4 pages) | Cited 1 time

Online Publication Date: 18 October 2012

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We have grown highly epitaxial and phase pure thin films of the arsenic-free pnictide compound CeNixBi2 on (100) MgO substrates by reactive molecular beam epitaxy (RMBE). X-ray diffraction and reflection high-energy electron diffraction of the films confirm the ZrCuSiAs structure with a Bi square net layer. Superconductivity was observed in magnetization and resistivity measurements for x = 0.75 to 0.93 in these CeNixBi2 thin films with the highest critical temperature of 4.05 K and a resistive transition width of 0.1 K for x = 0.86. Our results indicate that thin film deposition by RMBE provides a tool to synthesize high-quality pnictide superconductors of the novel 112 type.
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74.78.-w Superconducting films and low-dimensional structures
74.25.Ha Magnetic properties including vortex structures and related phenomena
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
74.25.F- Transport properties
74.70.Xa Pnictides and chalcogenides

Observation of partial Meissner effect and flux pinning in superconducting lead containing non-superconducting parts

W. Treimer, O. Ebrahimi, and N. Karakas

Appl. Phys. Lett. 101, 162603 (2012); http://dx.doi.org/10.1063/1.4762860 (4 pages)

Online Publication Date: 19 October 2012

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Partially suppressed Meissner effect and magnetic flux trapping in the bulk of poly-crystalline Pb samples with virtually zero demagnetization and large (cm3) volume containing non-superconducting parts could be visualized by polarized neutrons and quantified with respect to the shape and amount of the trapped flux in the intermediate state of lead. These measurements provided a unique look at the macroscopic Quantum mechanics effects and the coexistence of superconducting state, intermediate state, and normal conducting parts in the same sample, respectively.
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74.25.Ha Magnetic properties including vortex structures and related phenomena
74.25.Wx Vortex pinning (includes mechanisms and flux creep)
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
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