ELECTRICAL-RESISTIVITY OF UP1-XSX SOLID-SOLUTIONS WITH APPLIED UNIAXIAL-STRESS OR MAGNETIC-FIELD

The electrical resistivity temperature variation of UP-US solid soluti ons has been measured on single crystals, below 300 K, under or withou t uniaxial stress or magnetic field. Uniaxial stress effects on the el ectrical resistivity can be explained from magnetic domain distributio n and magnetic resistivity anisotropy. These effects are corroborated by experiments under a magnetic field. For every compound, applied uni axial stress corresponding to a pressure of about 1000 bar is sufficie nt to saturate the resistivity. This saturation Value is significant t o discuss the transport properties of these compounds. All the results in antiferromagnetic single-k phases of different solid solutions are very coherent and can be interpreted from a conductivity maximum when all magnetic moments are parallel to the electrical current direction . A new antiferromagnetic phase has been evidenced in UP0.8S0.2 under magnetic fields at low temperature.