Superconductivity in Ultrathin Nb<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Se</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Layers

The superconducting resistive transition of the layer compound Nb${\mathrm{Se}}_{2}$ has been observed for crystals a few layers thick. The ${T}_{c}$ decreases as the crystal thickness is reduced below six Nb${\mathrm{Se}}_{2}$ layers, and a ${T}_{c}$ of 3.8\ifmmode^\circ\else\textdegree\fi{}K is predicted for a single layer. No significant increase in the transition width is observed as the number of Nb${\mathrm{Se}}_{2}$ layers is reduced. The results are compared to recent work on intercalated layer compounds.

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