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23 Jun 2008

Volume 92, Issue 25, Articles (25xxxx)

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Appl. Phys. Lett. 92, 254102 (2008); http://dx.doi.org/10.1063/1.2945893 (3 pages)

M. Trinker, S. Groth, S. Haslinger, S. Manz, T. Betz, S. Schneider, I. Bar-Joseph, T. Schumm, and J. Schmiedmayer
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Evidence for electromagnetic granularity in the polycrystalline iron-based superconductor LaO0.89F0.11FeAs

A. Yamamoto, J. Jiang, C. Tarantini, N. Craig, A. A. Polyanskii, F. Kametani, F. Hunte, J. Jaroszynski, E. E. Hellstrom, D. C. Larbalestier, R. Jin, A. S. Sefat, M. A. McGuire, B. C. Sales, D. K. Christen, et al.

Appl. Phys. Lett. 92, 252501 (2008); http://dx.doi.org/10.1063/1.2952195 (3 pages) | Cited 39 times

Online Publication Date: 23 June 2008

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The recently discovered oxypnictide superconductors are layered, low carrier density compounds with many similarities to the high-Tc cuprates. An important question is whether they also exhibit weak-coupling across randomly oriented grain boundaries. In this work we show considerable evidence for such weak coupling by study of the dependence of magnetization in bulk and powdered samples. Bulk sample magnetization curves show very little hysteresis while remanent magnetization shows almost no sample size dependence, even after powdering. We conclude that these samples exhibit substantial electromagnetic granularity on a scale approximating the grain size, though we cannot yet determine whether this is intrinsic or extrinsic.
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74.25.Ha Magnetic properties including vortex structures and related phenomena
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
74.70.Dd Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.)

Effect of γ precipitates on martensitic transformation and magnetic properties in aged Mn–Ni–Ga alloys

W. Cai, J. Zhang, Z. Y. Gao, and J. H. Sui

Appl. Phys. Lett. 92, 252502 (2008); http://dx.doi.org/10.1063/1.2943661 (3 pages) | Cited 2 times

Online Publication Date: 26 June 2008

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Multiple martensitic transformation peaks were observed from differential scanning calorimetry curves in aged Mn50Ni25Ga25 alloys in which transformation temperature varied with aging temperature. The magnetization and coercivity were enhanced as a result of aging above magnetic transition temperature. A maximum magnetization up to 54 emu/g and a magnetization difference between two phases of 28 emu/g was achieved in the alloy aged at 873 K. However, coercivity as large as 1.2 kOe was obtained in 573 K aged alloy, with a high saturation field, which can be understood in terms of domain wall pinning.
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81.30.Kf Martensitic transformations
81.40.Cd Solid solution hardening, precipitation hardening, and dispersion hardening; aging
75.50.Vv High coercivity materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.60.Ch Domain walls and domain structure
75.40.-s Critical-point effects, specific heats, short-range order
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