Magnetic properties of the heavy fermion antiferromagnet YbPtIn

Abstract Magnetization of the heavy fermion antiferromagnet YbPtIn (T N 1 =3.4 K , T N 2 =1.4 K ) has been measured in pulsed magnetic field up to 52 T . Below T N2 , multistep metamagnetic jumps are observed for H ⊥ c , which may be attributed to an existence of a complex magnetic structure originating from a frustrated magnetic interaction. A new phase appears below 7 K and 0.1 T for H ⊥ c by applying high pressure of 0.95 GPa .