Thermal expansion measurement under pressure of UGe2

Volume expansion measurements of single crystalline UGe2 samples have been made under pressure. The linear coefficient alpha(V) (T) at ambient pressure shows a broad hump at around T-x similar to 25 K and a sharp transition at T-C = 52 K. We have observed that the anomaly in Deltaalpha(V) at T-x becomes prominent and increases in magnitude with increasing pressure. (C) 2003 Elsevier Science B.V. All rights reserved.