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Magnetoresistivity and Hc2(T) in MgB2

Phys. Rev. B 63, 220503(R) – Published 11 May 2001
S. L. Bud’ko, C. Petrovic, G. Lapertot, C. E. Cunningham, P. C. Canfield, M-H. Jung, and A. H. Lacerda


Detailed magnetotransport data on dense wires of MgB2 are reported for applied magnetic fields up to 18 T. The temperature and field dependencies of the electrical resistivity are consistent with MgB2 behaving like a simple metal and following a generalized form of Kohler’s rule. In addition, given the generally higher-Tc values and narrower resistive transition widths associated with MgB2 synthesized in this manner, combined with applied magnetic fields of up to 18 T, an accurate and complete Hc2(T) curve could be determined. This curve agrees well with curves determined from lower field measurements on sintered pellets and wires of MgB2. Hc2(T) is linear in T over a wide range of temperature (7 K<~T<~32 K) and has an upward curvature for T close to Tc. These features are similar to other high κ, clean limit, boron-bearing intermetallics: YNi2B2C and LuNi2B2C.

DOI: http://dx.doi.org/10.1103/PhysRevB.63.220503

  • Received 22 February 2001
  • Published 11 May 2001

© 2001 The American Physical Society

Authors & Affiliations

S. L. Bud’ko, C. Petrovic, G. Lapertot*, C. E. Cunningham, and P. C. Canfield

  • Ames Laboratory, U.S. Department of Energy and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011

M-H. Jung and A. H. Lacerda

  • National High Magnetic Field Laboratory - Pulse Facility, Los Alamos National Laboratory, MS E536 Los Alamos, New Mexico 87545

  • *On leave from Commissariat a l’Energie Atomique, DRFMC-SPSMS, 38054 Grenoble, France.
  • On leave from Dept. of Physics, Grinnell College, Grinnell, IA 50112.
  • Also at Department of Physics, New Mexico State University, Las Cruces, New Mexico.

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