Both specific heat and resistance measurements of organic superconductor κ-(ET)2Cu(NCS)2 under magnetic field were performed. Upper critical fields, obtained from the specific heat data, are significantly less than those from the magnetoresistance measurements. At temperatures below 2 K and magnetic fields below 1 T, we observed additional power dissipation due to the field sweep. This effect may be attributed to the existence of irreversibility line. [ABSTRACT FROM AUTHOR]
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