title: Sign reversal of field-angle resolved heat capacity oscillations in a heavy Fermion superconductor CeCoIn5 and d{x{2}-y{2}} pairing symmetry.
abstract: To identify the superconducting gap symmetry in CeCoIn5 (T{c}=2.3 K), we measured the angle-resolved specific heat (C{phi}) in a field rotated around the c axis down to a very low temperature, 0.05T{c}, and made detailed theoretical calculations. In a field of 1 T, a sign reversal of the fourfold angular oscillation in C{phi} was observed at T approximately 0.1T{c} upon entering a quasiclassical regime where the maximum of C{phi} corresponds to the antinodal direction, coinciding with the angle-resolved density of states (ADOS) calculation. The C{phi} behavior, which exhibits minima along the [110] directions, unambiguously allows us to conclude d{x{2}-y{2}} symmetry of this system. The ADOS-quasiclassical region is confined to a narrow T and H domain within T/T{c} approximately 0.1 and 1.5 T (0.13H{c2}).
authors.affiliation: Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
authors.forename: K
authors.initials: K
authors.lastname: An
authors.forename: T
authors.initials: T
authors.lastname: Sakakibara
authors.forename: R
authors.initials: R
authors.lastname: Settai
authors.forename: Y
authors.initials: Y
authors.lastname: Onuki
authors.forename: M
authors.initials: M
authors.lastname: Hiragi
authors.forename: M
authors.initials: M
authors.lastname: Ichioka
authors.forename: K
authors.initials: K
authors.lastname: Machida