Effect of pressure on the physical properties of UTe2

The mysterious unconventional superconducting properties in UTe2 attracts much attention in the field of heavy-fermion physics. Superconductivity is observed below Tsc = 1.6 K at ambient pressure.
Despite no long-range magnetic ordering, the superconducting phase diagram of UTe2 infers that of the ferromagnetic superconductors such as URhGe and UCoGe and thus UTe2 is believed to be a nearly ferromagnetic spin-triplet superconductor.
Recently, a pressure-induced multiple superconducting phases in UTe2 is reported.
The superconducting phase at ambient pressure (SC1) turns to two SC phases above rather low pressure of 0.25 GPa.
It is also reported that SC phases disappears and pressure-induced magnetic ordering phase appears above 1.7 GPa.
We have carried out electrical resistivity and magnetic susceptibility measurements under high pressure to investigate physical properties of UTe2.
Single crystals of UTe2 were grown by the chemical vapor transport method using iodine for a transport agent.
Electrical resistivity under high pressures up to 8 GPa was measured by means of a conventional four prove method using a cubic anvil press system installed at the Institute of Solid State Physics, the University of Tokyo.
The magnetic susceptibility and the magnetization measurements under pressure were performed at temperatures down to 2 K and at fields up to 5T using a piston cylinder cell up to 1.7 GPa and diamond anvil cell up to 5 GPa in a commercial SQUID magnetometer.