Search for magnetic ordering in the cubic Kondo compound YbPdSb

To search for magnetic ordering in YbPdSb we performed low temperature measurements of electric resistivity (T≥0.5K), specific heat (T≥0.6K), Moessbauer spectroscopy (T≥0.07K) and neutron diffraction (T≥0.01K). All experiments were performed on the same YbPdSb sample. The results suggest the existence of a magnetic short range order in YbPdSb: decreasing temperature from 4.2K towards 1K antiferromagnetic short-range order appears in the neutron diffraction spectra. No magnetic Bragg peaks are observed down to 0.01K. The presence of a hyperfine field in the Moessbauer spectra indicates spatial correlations of Yb3+ moments up to 5K. These correlations correspond to a magnetic moment of 1.3μB at 0.07K and are of dynamical nature above 1K. ((orig.))