Effect of pressure on the ferroquadrupolar compound TmAu2

TmAu2 with a simple body-centered tetragonal MoSi2-type structure undergoes an electric transition to a ferroquadrupolar ordered state at T-Q of 7.0 K and a magnetic transition to an antiferomagnetic state at T-N Of 3.2 K, We have measured pressure dependence of electrical resistivity on single-crys talline TmAu2 sample. The results reveal that the T-N decreased with increa sing pressure (partial derivative T-N/partial derivative P = - 4.54 mK/kbar ), while the T-Q increased with increasing pressure (partial derivative T-Q /partial derivative P = 21.5 mK/kbar). (C) 2000 Elsevier Science B.V. All r ights reserved.