Structures, charge density wave, and superconductivity of noncentrosymmetric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>4</mml:mn><mml:msub><mml:mi>H</mml:mi><mml:mi mathvariant="normal">a</mml:mi></mml:msub><mml:mtext>−</mml:mtext><mml:msub><mml:mi>NbSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Abstract

Here, the authors report the charge density wave and superconductivity of noncentrosymmetric 4${H}_{a}$-NbSe${}_{2}$. In particular, it exhibits a large upper critical field ${H}_{c2}$(0) well beyond the Pauli paramagnetic limit. ${H}_{c2}$($T$) could be described by a two-band scenario that is also revealed via lower critical field and specific heat. The high ${H}_{c2}$ is expected to motivate the search of high-field superconductors in noncentrosymmetric materials.

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