2002/09/24 by K. Izawa, Y. Nakajima, Yasuyuki Nakajima +13 · 9 citations
Materials Science · Mathematics · Physics and Astronomy · #Combinatorics #Condensed matter physics #Geometry #Homogeneous space #Iron-based superconductors research #Mathematics #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Singularity #Superconductivity #Topology (electrical circuits) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.90.117001
4 Pages, 4 Figures
arxiv created 2002/09/24 · openalex publication_date 2003/03/17 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The superconducting gap structure of recently discovered heavy fermion superconductor PrOs4Sb12 was investigated by using thermal transport measurements in magnetic field rotated relative to the crystal axes. We demonstrate that a novel change in the symmetry of the superconducting gap function occurs deep inside the superconducting state, giving a clear indication of the presence of two distinct superconducting phases with twofold and fourfold symmetries. We infer that the gap functions in both phases have a point node singularity, in contrast to the familiar line node singularity observed in almost all unconventional superconductors.