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The Magnetoresistance in Iron-based Superconductors
B. Lv,R. B. Xie,S. L. Liu,G. J. Wu,H. M. Shao,X. S. Wu 한국자기학회 2011 Journal of Magnetics Vol.16 No.2
The phase transition of vortex matter from solid to liquid was studied in iron-based superconductors. Based on the traditional vortex glass theory, we have examined the magnetoresistivity data of iron-based superconductors using our extended thermal activation model: ρ(B,T) = ρ((T-Tg(B))/(Tc(0)-Tg(B)))<SUP>v(z-1)</SUP>. We predict that the magnetic field-dependent area S + S? which integrates ρ with T is proportional to B<SUP>β</SUP>, where β is the vortex glass transition exponent. From our calculation, the vortex glass transition exponent is 0.33, close to the exponent of area S?+ S is 0.31 in SmO0.9F0.1FeAs; the exponent of area S is 0.63, which is close to the irreversibility line exponent 2/3. Both of the results show the validity of our model. In addition, our model is shown to be effective in describing irreversibility behavior in layered superconductors.
C.W. Zou,J. Wang,F. Liang,W. Xie,L.X. Shao,D. J. Fu 한국물리학회 2012 Current Applied Physics Vol.12 No.5
Thermal evaporation was carried out in a horizontal quartz tube under an oxygen flow of about 50 ml/min and the influence of reaction time and temperature on the microstructure of the CuO nanowires (CNWs) is examined. The magnetic susceptibilities of the as-synthesized CNWs in the 5e300 K range were studied. It is interesting to note that the CNWs with a much larger diameter than 10 nm exhibit anomalous ferromagnetic behavior which has never been reported previously, demonstrating the effect of their peculiar morphology. The saturation magnetization (MS) and coercive field (Hc) of CNWs grown at 700 ℃ are 2.39 × 10-4 emu and 48 Oe, respectively. We fabricated gas sensors based on p-type single CNWs and demonstrate that CuO nanowires could be a promising candidate for a gas sensor with good performance. The reaction between the reducing gas and O leads to a decrease of the hole density in the surface charge layer and an increase of the CuO resistance.