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Specific heat measurements of a superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>NbS</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>single crystal in an external magnetic field: Energy gap structure
The heat capacity of a $2{\text{H-NbS}}_{2}$ single crystal has been measured by a highly sensitive ac technique down to 0.6 K and in magnetic fields up to 14 T. At very low temperatures, data show excitations over an energy gap $(2{\ensuremath{\Delta}}_{S}/{k}_{B}{T}_{c}\ensuremath{\approx}2.1)$ much smaller than the BCS value. The overall temperature …