Pressure effect on the magnetic properties in YbXCu4 (X=In and Cu)

Abstract The pressure-induced magnetic ordering recently found in YbInCu4 has been confirmed by the nuclear quadrupole resonance (NQR) measurement under pressure above PC∼2.45 GPa. The obtained results indicate that the transition between a well-localized phase at high temperature and a valence fluctuating Fermi liquid state at low temperature is of the first-order up to the critical pressure of PC. We also report the results of the nuclear magnetic resonance (NMR) measurements on YbCu5 with the cubic structure prepared by melt spinning technique.