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6 Aug 2012

Volume 101, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 101, 062401 (2012); http://dx.doi.org/10.1063/1.4730997 (4 pages)

Mahdi Jamali, Kulothungasagaran Narayanapillai, Jae Hyun Kwon, and Hyunsoo Yang
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A spin triplet supercurrent in half metal ferromagnet/superconductor junctions with the interfacial Rashba spin-orbit coupling

ZhiPing Niu

Appl. Phys. Lett. 101, 062601 (2012); http://dx.doi.org/10.1063/1.4743001 (3 pages) | Cited 1 time

Online Publication Date: 6 August 2012

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dc Josephson currents in s-wave superconductor/half metal ferromagnet (HMF)/s-wave superconductor junctions are investigated. We propose the interfacial Rashba spin-orbit coupling as a possible mechanism giving rise to the spin flip Andreev reflection, which results in the singlet-triplet conversion at HMF/superconductor interfaces. When the magnetization direction of the HMF and that of the effective spin-orbit magnetic field are noncolinear, a long-ranged spin triplet supercurrent appears. The supercurrent strongly depends on the magnetization direction of the HMF and can be enhanced by the Rashba spin-orbit coupling strength.
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74.50.+r Tunneling phenomena; Josephson effects
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Tj Spin-orbit effects
74.25.fc Electric and thermal conductivity
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
74.25.Ha Magnetic properties including vortex structures and related phenomena

A Josephson junction defect spectrometer for measuring two-level systems

M. J. A. Stoutimore, M. S. Khalil, C. J. Lobb, and K. D. Osborn

Appl. Phys. Lett. 101, 062602 (2012); http://dx.doi.org/10.1063/1.4744901 (4 pages) | Cited 1 time

Online Publication Date: 8 August 2012

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We have fabricated and measured Josephson junction (JJ) defect spectrometers, which are frequency-tunable, nearly harmonic oscillators that probe strongly coupled two-level systems (TLSs) in the barrier of a JJ. The JJDSs accommodate a wide range of junction inductances, LJ, while maintaining a resonance frequency, fres, in the range of 4–8 GHz. By applying a magnetic flux bias to tune fres, we detect strongly coupled TLSs in the junction barrier as splittings in the device spectrum. JJDSs fabricated with a via-style Al/thermal AlOx/Al junction and measured between 30–45 mK with single-photon excitation levels show a density of TLSs in the range σTLSh ≈ 0.4-0.5/GHzμm2, and a junction loss tangent of tanδJ ≈ 2.9×10−3.
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85.25.-j Superconducting devices
85.25.Cp Josephson devices
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