We have carried out the electrical resistivity measurements under high pressures and high magnetic fields in NpPd5Al2 in order to investigate a quantum critical behavior and the stability of the superconducting phase. A T-linear dependence of the electrical resistivity is changed into the Fermi liquid relation of ρ ∼ AT2 under the magnetic fields, and A value indicates a divergent feature around the upper critical field Hc2, indicating the existence of a field-tuned quantum critical point (QCP) around Hc2. With increasing pressure, the superconducting transition temperature Tsc decreases and becomes zero above 5.7 GPa, together with a decrease of the upper critical field, indicating that the electronic state of NpPd5Al2 is located in the vicinity of QCP at ambient pressure and deviates from QCP with increasing pressure. Furthermore, we have constructed the superconducting phase diagram at 3.71 GPa.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)