Magnetoresistance, voltage-current characteristics, and Hall effect measurements of bulk MgB<sub>2</sub> superconductors

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Date

2004

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Wiley-v C H verlag Gmbh

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Department of Electrical & Electronics Engineering
Department of Electrical and Electronics Engineering (EE) offers solid graduate education and research program. Our Department is known for its student-centered and practice-oriented education. We are devoted to provide an exceptional educational experience to our students and prepare them for the highest personal and professional accomplishments. The advanced teaching and research laboratories are designed to educate the future workforce and meet the challenges of current technologies. The faculty's research activities are high voltage, electrical machinery, power systems, signal and image processing and photonics. Our students have exciting opportunities to participate in our department's research projects as well as in various activities sponsored by TUBİTAK, and other professional societies. European Remote Radio Laboratory project, which provides internet-access to our laboratories, has been accomplished under the leadership of our department with contributions from several European institutions.

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Abstract

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. T-c 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 proportional to I-beta(T,I- B). The change of beta with temperature and magnetic field was shown and discussed. R-H is positive under positive applied magnetic field. The 1/R-H linear dependency on T, usually observed in high temperature superconductors, could not be observed in our case. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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Kayed, Tarek/0000-0003-3482-4166

Keywords

superconductivity, hall effect, transport properties, MgB2

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Citation

5

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Q3

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Volume

39

Issue

1

Start Page

50

End Page

55

URI

https://doi.org/10.1002/crat.200310148
 https://hdl.handle.net/20.500.14411/1081

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