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28 May 2012

Volume 100, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 100, 222402 (2012); http://dx.doi.org/10.1063/1.3700809 (4 pages)

Felix Balhorn, Simon Jeni, Wolfgang Hansen, Detlef Heitmann, and Stefan Mendach
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Ferromagnetic Josephson switching device with high characteristic voltage

Timofei I. Larkin, Vitaly V. Bol’ginov, Vasily S. Stolyarov, Valery V. Ryazanov, Igor V. Vernik, Sergey K. Tolpygo, and Oleg A. Mukhanov

Appl. Phys. Lett. 100, 222601 (2012); http://dx.doi.org/10.1063/1.4723576 (5 pages) | Cited 3 times

Online Publication Date: 30 May 2012

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We develop a fast magnetic Josephson junction (MJJ)—a superconducting ferromagnetic device for a scalable high-density cryogenic memory compatible in speed and fabrication with energy-efficient single flux quantum (SFQ) circuits. We present experimental results for superconductor-insulator-ferromagnet-superconductor (SIFS) MJJs with high characteristic voltage IcRn of >700 μV proving their applicability for superconducting circuits. By applying magnetic field pulses, the device can be switched between MJJ logic states. The MJJ IcRn product is only ∼30% lower than that of conventional junction co-produced in the same process, allowing for integration of MJJ-based and SIS-based ultra-fast digital SFQ circuits operating at tens of gigahertz.
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85.25.Cp Josephson devices
84.30.Sk Pulse and digital circuits
85.25.Hv Superconducting logic elements and memory devices; microelectronic circuits

Superconducting fluctuations and anomalous phonon renormalization much above superconducting transition temperature in Ca4Al2O5.7Fe2As2

Pradeep Kumar, A. Bera, D. V. S Muthu, P. M. Shirage, A. Iyo, and A. K. Sood

Appl. Phys. Lett. 100, 222602 (2012); http://dx.doi.org/10.1063/1.4724206 (3 pages) | Cited 2 times

Online Publication Date: 31 May 2012

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Raman studies on Ca4Al2O5.7Fe2As2 superconductor in the temperature range of 5 K to 300 K, covering the superconducting transition temperature Tc = 28.3 K, reveal that the Raman mode at ∼230 cm−1 shows a sharp jump in frequency by ∼2% and linewidth increases by ∼175% at To ∼ 60 K. Below To, anomalous softening of the mode frequency and a large decrease by ∼10 cm−1 in the linewidth are observed. These precursor effects at T0 (∼2Tc) are attributed to significant superconducting fluctuations, possibly enhanced due to reduced dimensionality arising from weak coupling between the well separated (∼15 Å) Fe-As layers in the unit cell. A large blue-shift of the mode frequency between 300 K and 60 K (∼7%) indicates strong spin-phonon coupling in this superconductor.
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74.40.-n Fluctuation phenomena
74.25.Gz Optical properties
74.62.-c Transition temperature variations, phase diagrams
74.10.+v Occurrence, potential candidates
74.25.Kc Phonons
74.70.Xa Pnictides and chalcogenides
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