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We calculate angle-dependent heat capacity in a low magnetic field range onthe basis of Kramer-Pesch approximation together with an electronic structureobtained by first-principles calculations to determine a superconducting gapfunction of (TMTSF)2ClO4 through its comparisons with experiments. The presentcomparative studies reveal that a nodal d-wave gap function consistentlyexplains the experimental results for (TMTSF)2ClO4. Especially, it isemphasized that the observed unusual axis-asymmetry of the angle-dependenceeliminates the possibility of s-wave and node-less d-wave functions. It is alsofound that the directional ordering of ClO4 anions does not have anysignificant effects on the Fermi surface structure contrary to the previousmodelings since the two Fermi surfaces obtained by the band calculations almostcross within the present full accuracy in first-principles calculations.

physical review. b, condensed matter and materials physics

Superconducting gap function in the organic superconductor (TMTSF)2ClO4  with anion ordering; First-principles calculations and quasiclassical  analysis for angle-resolved heat capacity