Pressure effect on some magnetic properties of the HfFe6Ge6-type ScMn6Sn5.45In0.55, YMn6Sn5.65In0.35 and LuMn6Sn5.1In0.9 compounds

Temperature and pressure dependence of magnetic properties of HfFe6Ge6-type ScMn6Sn5.45In0.55, YMn6Sn5.65In0.35 and LuMn6Sn5.1In0.9 compounds are reported. The three compounds are characterized by similar magnetic properties. At ambient pressure, they order ferromagnetically about the room temperature (293pTcp356 K) and undergo a ferroto helimagnetic transition upon cooling (235pTtp327 K). The external pressure acts in the same way for all three compounds. The increase of pressure yields a linear increase of Tc and a decrease of Tt. The present results are discussed and compared with the corresponding properties of the isotypic compounds RMn6Ge6 xGax (R=Sc, Y, Lu).