Growth, Characterization and Fermi Surface of Heavy Fermion CeCoIn5 Superconductor

TL;DR

This study reports the growth, detailed characterization, and electronic structure analysis of high-quality CeCoIn5 heavy Fermion superconductor crystals, revealing Fermi surface features consistent with itinerant 4f electrons and providing insights into its superconducting properties.

Contribution

It presents the first comprehensive growth, structural, and electronic characterization of CeCoIn5 single crystals, including ARPES measurements that elucidate its Fermi surface and electronic structure.

Findings

Superconducting transition temperature Tc ~ 2.3 K

Resistivity hump at ~45 K indicating heavy Fermion behavior

Fermi surface sheets consistent with band structure calculations

Abstract

High quality single crystals of heavy Fermion CeCoIn5 superconductor have been grown by flux method with a typical size of (1~2)mm x (1~2)mm x ~0.1 mm. The single crystals are characterized by structural analysis from X-ray diffraction and Laue diffraction, as well as compositional analysis. Magnetic and electrical measurements on the single crystals show a sharp superconducting transition with a transition temperature at Tc(onset) ~ 2.3 K and a transition width of ~0.15 K. The resistivity of the CeCoIn5 crystal exhibits a hump at ~45 K which is typical of a heavy Fermion system. High resolution angle-resolved photoemission spectroscopy (ARPES) measurements of CeCoIn5 reveal clear Fermi surface sheets that are consistent with the band structure calculations when assuming itinerant Ce 4f electrons at low temperature. This work provides important information on the electronic structure of heavy Fermion CeCoIn5 superconductor. It also lays a foundation for further studies on the physical properties and superconducting mechanism of the heavy Fermion superconductors.