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Evidence for nodal superconductivity in quasi-one-dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">K</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
The recent discovery of superconductivity in the quasi-one-dimensional compound ${\mathrm{K}}_{2}{\mathrm{Cr}}_{3}{\mathrm{As}}_{3}$, which consists of double-walled tubes of ${[{({\mathrm{Cr}}_{3}{\mathrm{As}}_{3})}^{2\ensuremath{-}}]}^{\ensuremath{\infty}}$ that run along the $c$ axis, has attracted immediate attention as a potential system for studying superconductors with reduced dimensionality. Here we report clear experimental evidence for the unconventional nature of the superconducting …