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Two-band effects in the angular dependence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>H</mml:mi><mml:mrow><mml:mi>c</mml:mi><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MgB</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>single crystals
The angular dependence of the upper critical field ${H}_{c2}$ of ${\mathrm{MgB}}_{2}$ single crystals is studied at various temperatures by means of specific-heat and transport measurements in magnetic fields up to $17\phantom{\rule{0.3em}{0ex}}\mathrm{T}$. Clear deviations from Ginzburg--Landau behavior are observed at all temperatures and are explained by two-band effects. The angular dependence …