High quality single crystals of heavy Fermion CeCoIn_(5) superconductor have been grown by flux method with a typical size of(1-2)×(1-2)×(~0.1)mm^(3).The single crystals are characterized by structural analy...High quality single crystals of heavy Fermion CeCoIn_(5) superconductor have been grown by flux method with a typical size of(1-2)×(1-2)×(~0.1)mm^(3).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 T_(c,onset)~2.3 K and a transition width of~0.15 K.The resistivity of the CeCoIn_(5) crystal exhibits a hump at~45 K,which is typical of a heavy Fermion system.High resolution angle-resolved photoemission spectroscopy(ARPES)measurements of CeCoIn_(5) 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 CeCoIn_(5) superconductor.It also lays a foundation for further studies on the physical properties and superconducting mechanism of the heavy Fermion superconductors.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 10734120the National Basic Research Prograom of China under Grant No 2011CB921703.
文摘High quality single crystals of heavy Fermion CeCoIn_(5) superconductor have been grown by flux method with a typical size of(1-2)×(1-2)×(~0.1)mm^(3).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 T_(c,onset)~2.3 K and a transition width of~0.15 K.The resistivity of the CeCoIn_(5) crystal exhibits a hump at~45 K,which is typical of a heavy Fermion system.High resolution angle-resolved photoemission spectroscopy(ARPES)measurements of CeCoIn_(5) 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 CeCoIn_(5) superconductor.It also lays a foundation for further studies on the physical properties and superconducting mechanism of the heavy Fermion superconductors.
