Abstract
Precise electrical resistivity and ac calorimetry measurements under pressures have revealed the (P, T) phase diagram of a mixed-valent compound YbPd. The diagram is rather complicated, reflecting the valence and magnetic instability. In addition to the reported phase transitions at TN = 1.9 K and TMH = 0.5 K, the lower temperature transition at TML = 0.3 K has been confirmed thermodynamically. TN decreases monotonically up to 1.7 GPa and disappears discontinuously at Pc ~1.9 GPa, accompanying the drastic enhancement of the effective mass and the residual resistivity, although the ordered phase below TML still remains. At Pc, the both of magnetic and valence fluctuations seems to develop.
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