Coexistence of ferromagnetism and superconductivity in cerium, tellurium (1.82).

CeTe1 .82 crystallizes in layered tetragonal Cu2Sb-type structure. At ambient pressure, the presence of the charge density wave (CDW) gap accompanying with a lattice distortion in the Te sheet is verified by electron-tunneling spectroscopy measurement. We measured the electrical resistivity on a CeTe1 .82 single crystal as a function of temperature and magnetic field (i // ab-plain, H// c-axis) performed under hydrostatic pressure up to 9 kbar using the 20 T superconduting magnet at the Pulse Field Facility, NHMFL, Los Alamos National Laboratory . Some of the results are shown in Fig.l, which represent the low temperature dependence of the normalized resistance under applied pressure of 5 kbar, the superconducting transition is observed at TC = 2 .7K (well below the magnetic ordering temperatures, the Neel temperature TN = 4 .8K and the shortrange ferromagnetic temperature TSRF = 6K in 5 kbar). This (SC) transition temperature is the highest among f-electron systems . The application of magnetic field suppresses the resistivity drop as expected for a supeconducting transition . The coexisting magnetic structure of a mixed ferromagnetism and antiferromagnetism can provide a clue for this remarkably high Tsc