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First-order transition switch-off of superconductivity in UGe2 |
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| Authors: | N Kabeya R Iijima S Ban K Deguchi Y Homma NK Sato |
| Institution: | a Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan b Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan c Institute for Materials Research, Tohoku University, Ibaraki 331-1313, Japan |
| Abstract: | The ac magnetic susceptibility, the thermal expansion and the magnetostriction were measured using a single crystalline sample of UGe2 under pressure. We find that as the field exceeds a transition field, where the system transforms from a high pressure phase (P>PX) into a low pressure phase (P<PX), the superconductivity steeply collapses within a transient region arising from the pressure inhomogeneity. We also estimate an accurate value of PX in zero temperature limit and a pressure distribution around it. Using thus estimated quantity, we argue that the superconductivity (in zero magnetic field) below the critical pressure is not intrinsic but extrinsic due to the pressure inhomogeneity. |
| Keywords: | Superconductivity Ferromagnetism Magnetostriction Thermal expansion Ac magnetic susceptibility First-order transition UGe2 |
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