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23 Jul 2012

Volume 101, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 101, 043101 (2012); http://dx.doi.org/10.1063/1.4737152 (4 pages)

Toshiaki Tanigaki, Yoshikatsu Inada, Shinji Aizawa, Takahiro Suzuki, Hyun Soon Park, Tsuyoshi Matsuda, Akira Taniyama, Daisuke Shindo, and Akira Tonomura
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Pressure effects on the superconducting thin film Ba1−xKxFe2As2

Eunsung Park, Nam Hoon Lee, Won Nam Kang, and Tuson Park

Appl. Phys. Lett. 101, 042601 (2012); http://dx.doi.org/10.1063/1.4738783 (4 pages)

Online Publication Date: 23 July 2012

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We report electrical resistivity measurements on a high-quality Ba1−xKxFe2As2 thin film (x = 0.4) under pressure. The superconducting transition temperature (=39.95 K) of the optimally doped thin film shows a dome shape with pressure, reaching a maximal value 40.8 K at 11.8 kbar. The unusually high superconducting transition temperature and its anomalous pressure dependence are ascribed to a lattice mismatch between the LaAlO3 substrate and the thin film. The local temperature exponent of the resistivity (n = dlnΔρ/dlnT) shows a funnel shape around the optimal pressure, suggesting that fluctuations associated with the anomalous normal state are responsible for high-temperature superconductivity.
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74.25.F- Transport properties
74.70.Xa Pnictides and chalcogenides
74.62.-c Transition temperature variations, phase diagrams
74.78.-w Superconducting films and low-dimensional structures

Noise properties of high-Tc superconducting flux transformers fabricated using chemical-mechanical polishing

M. Chukharkin, A. Kalabukhov, J. F. Schneiderman, F. Öisjöen, O. Snigirev, Z. Lai, and D. Winkler

Appl. Phys. Lett. 101, 042602 (2012); http://dx.doi.org/10.1063/1.4738782 (5 pages) | Cited 1 time

Online Publication Date: 24 July 2012

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Reproducible high-temperature superconducting multilayer flux transformers were fabricated using chemical mechanical polishing. The measured magnetic field noise of the flip-chip magnetometer based on one such flux transformer with a 9 × 9 mm2 pickup loop coupled to a bicrystal dc SQUID was 15 fT/Hz1/2 above 2 kHz. We present an investigation of excess 1/f noise observed at low frequencies and its relationship with the microstructure of the interlayer connections within the flux transformer. The developed high-Tc SQUID magnetometers may be advantageous in ultra-low field magnetic resonance imaging and, with improved low frequency noise, magnetoencephalography applications.
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74.40.De Noise and chaos
07.55.Ge Magnetometers for magnetic field measurements
81.65.Ps Polishing, grinding, surface finishing
85.25.Dq Superconducting quantum interference devices (SQUIDs)

Electric-field-induced superconductivity at 9.4 K in a layered transition metal disulphide MoS2

Kouji Taniguchi, Akiyo Matsumoto, Hidekazu Shimotani, and Hidenori Takagi

Appl. Phys. Lett. 101, 042603 (2012); http://dx.doi.org/10.1063/1.4740268 (3 pages) | Cited 5 times

Online Publication Date: 27 July 2012

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Electro-static carrier doping was attempted in a layered transition metal disulphide MoS2 by constructing an electric double-layer transistor with an ionic liquid. With the application of gate voltage VG higher than 3 V, a metallic behavior was observed in the MoS2 channel. We found an onset of electric field-induced superconductivity in the field induced metallic phase. A maximum TC ∼ 9.4 K was observed, which could be higher than those in chemically doped bulk materials.
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74.20.Pq Electronic structure calculations
74.70.-b Superconducting materials other than cuprates

Frequency division multiplexing readout and simultaneous manipulation of an array of flux qubits

M. Jerger, S. Poletto, P. Macha, U. Hübner, E. Il’ichev, and A. V. Ustinov

Appl. Phys. Lett. 101, 042604 (2012); http://dx.doi.org/10.1063/1.4739454 (4 pages) | Cited 1 time

Online Publication Date: 27 July 2012

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An important desired ingredient of superconducting quantum circuits is a readout scheme whose complexity does not increase with the number of qubits involved in the measurement. Here, we present a readout scheme employing a single microwave line, which enables simultaneous readout of multiple qubits. Consequently, scaling up superconducting qubit circuits is no longer limited by the readout apparatus. Parallel readout of 6 flux qubits using a frequency division multiplexing technique is demonstrated, as well as simultaneous manipulation and time resolved measurement of 3 qubits. We discuss how this technique can be scaled up to read out hundreds of qubits on a chip.
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03.67.Lx Quantum computation architectures and implementations
85.25.Am Superconducting device characterization, design, and modeling
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