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30 Jan 2012

Volume 100, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 100, 053101 (2012); http://dx.doi.org/10.1063/1.3679127 (3 pages)

Shinya Kano, Yasuyuki Yamada, Kentaro Tanaka, and Yutaka Majima
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Correlation between superconductivity and structural properties under high pressure of iron pnictide superconductor Ce0.6Y0.4FeAsO0.8F0.2

M. Kanagaraj, S. Arumugam, Ravhi S. Kumar, N. R. Tamil Selvan, S. Esakki Muthu, J. Prakash, Gohil S. Thakur, H. Yoshino, K. Murata, K. Matsubayashi, Y. Uwatoko, S. Sinogeikin, Andrew Cornelius, A. K. Ganguli, and Yusheng Zhao

Appl. Phys. Lett. 100, 052601 (2012); http://dx.doi.org/10.1063/1.3681805 (4 pages)

Online Publication Date: 1 February 2012

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We report here the pressure dependence of the electrical resistivity and magnetic susceptibility of polycrystalline Ce0.6Y0.4FeAsO0.8F0.2 superconductor in the temperature range 4 K to 300 K up to 8 GPa. In-situ high pressure-low temperature x-ray diffraction was performed at 8 K up to 32 GPa using synchrotron x-rays with helium pressure medium. The results show that the applied pressure slightly increases the Tc up to 1 GPa and then it decreases on further pressure increase. The reduction of superconducting transition temperature occurs with a transition to a collapsed tetragonal phase and may be associated with a possible valence change of Ce.
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74.62.Fj Effects of pressure
75.30.Cr Saturation moments and magnetic susceptibilities

Long range supercurrents in ferromagnetic CrO2 using a multilayer contact structure

M. S. Anwar, M. Veldhorst, A. Brinkman, and J. Aarts

Appl. Phys. Lett. 100, 052602 (2012); http://dx.doi.org/10.1063/1.3681138 (3 pages) | Cited 6 times

Online Publication Date: 2 February 2012

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We report measurements of long ranged supercurrents through ferromagnetic and fully spin-polarized CrO2 deposited on TiO2 substrates. In earlier work, we found supercurrents in films grown on sapphire but not on TiO2. Here, we employed a special contact arrangement, consisting of a Ni/Cu sandwich between the film and the superconducting amorphous Mo70Ge30 electrodes. The distance between the contacts was almost a micrometer, and we find the critical current density to be significantly higher than found in the films deposited on sapphire. We argue this is due to spin mixing in the Ni/Cu/CrO2 layer structure, which is helpful in the generation of the odd-frequency spin triplet correlations needed to carry the supercurrent.
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74.25.Sv Critical currents
74.50.+r Tunneling phenomena; Josephson effects
74.78.Fk Multilayers, superlattices, heterostructures
74.55.+v Tunneling phenomena: single particle tunneling and STM
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