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Crystal Research and Technology |
Cryst. Res. Technol. 39,
50 (2004) - Abstract -
Magnetoresistance, voltage-current characteristics, and Hall effect measurements of bulk MgB2 superconductors
T. S. Kayed
Department of Electrical and Electronics Engineering, Atilim University, 06836 Ankara, Turkey
| Keywords | superconductivity, hall effect, transport properties, MgB2 |
| PACS | 74.10.+v, 74.70.Ad, 74.25.Fy |
| DOI | 10.1002/crat.200310148 |
Bulk MgB2 samples were prepared from the commercially available powder (Alfa-Aesar). One of the samples was used in measuring the transport properties by the DC four-probe technique while the other was used in measuring Hall effect using the van-der-Pauw configuration. From the transport measurements, we noticed that the R-T curves shift to lower temperatures under applied magnetic field without any observed enlargement of the transition width. Tc gradually decreases from 37 K at zero field to 32 K at B = 1.4 T. Our V-I data were found to obey a power law expression V ~ Iβ(T, B). The change of β with temperature and magnetic field was shown and discussed. RH is positive under positive applied magnetic field. The 1/ RH linear dependency on T, usually observed in high temperature superconductors, could not be observed in our case.
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