Transport and Magnetic Properties in MgB2 Single Crystals

Author： Lee H-S.   Kim K.H.P.   Choi J-H.   Jung C.U.   Chowdhury P.   Choi S.   Lee S-I.  

Publisher： Springer Publishing Company

ISSN： 0022-2291

Source： Journal of Low Temperature Physics, Vol.131, Iss.5-6, 2003-06, pp. : 1117-1127

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Abstract

We report measurements of the transport and the magnetic properties of high-quality MgB2 single crystals with clear hexagonal-plate shapes. The Debye temperature of θD∼1100 K, obtained from the zero-field resistance curve, suggests that the normal-state transport properties are dominated by electron-phonon interactions. The resistivity ratio between 40 K and 300 K is about 5. The superconducting anisotropy, γ, increases from a value around 2 near Tc to about 3.3 at 26 K. The low-field magnetization and the magnetic hysteresis curves show the bulk pinning of these crystals to be very weak.

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