Study of the magnetic superconductor,Y9Co7, at high pressure and high magnetic field |
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Authors: | CY Huang CE Olsen WW Fuller JH Huang SA Wolf |
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Institution: | 1. Center for Nonlinear Studies Physics Division Los Alamos National Laboratory, Los Alamos, NM 87545, USA;2. Condensed Matter and Radiation Sciences Division Naval Research Laboratory, Washington, DC 20375, USA |
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Abstract: | We have measured the electrical resistance and magnetic susceptibility of the magnetic superconductor, YgCo7, at pressures up to 20 kbar and in magnetic fields up to 6T. We have found that pressure suppresses the magnetism resulting in a higher superconducting transition temperature and conclude that Y9Co7 is an itinerant ferromagnet, not a spin-glass. Pressure also sharpens the superconducting transition and increases the critical magnetic field, signifying that the long range ferromagnetic and superconducting order parameters co-exist but vary spatially. For pressures greater than 6 kbar, the magnetoresistance is always positive, further indicating the suppresion of magnetism by high pressure. |
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