Magnetoresistivity and $H_{c 2} (T)$ in ${MgB}_{2}$

Detailed magnetotransport data on dense wires of

{MgB}_{2}

are reported for applied magnetic fields up to 18 T. The temperature and field dependencies of the electrical resistivity are consistent with

{MgB}_{2}

behaving like a simple metal and following a generalized form of Kohler’s rule. In addition, given the generally higher-

T_{c}

values and narrower resistive transition widths associated with

{MgB}_{2}

synthesized in this manner, combined with applied magnetic fields of up to 18 T, an accurate and complete

H_{c 2} (T)

curve could be determined. This curve agrees well with curves determined from lower field measurements on sintered pellets and wires of

{MgB}_{2} .

H_{c 2} (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

T_{c} .

These features are similar to other high κ, clean limit, boron-bearing intermetallics:

{YNi}_{2} B_{2} C

and

{LuNi}_{2} B_{2} C .

This publication has 12 references indexed in Scilit:

Magnetoresistivity andHc2(T)inMgB2