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Thermal expansion measurements have been carried out on single-crystallineURhGe in the temperature range from 2 to 200 K. At the ferromagnetic transition(Curie temperature T_C = 9.7 K), the coefficients of linear thermal expansionalong the three principal orthorhombic axes all exhibit pronounced positivepeaks. This implies that the uniaxial pressure dependencies of the Curietemperature, determined by the Ehrenfest relation, are all positive.Consequently, the calculated hydrostatic pressure dependence dT_C/dp ispositive and amounts to 0.12 K/kbar. In addition, the effective Gruneisenparameter was determined. The low-temperature electronic Gruneisen parameter\Gamma_{sf} = 14 indicates an enhanced volume dependence of the ferromagneticspin fluctuations at low temperatures. Moreover, the volume dependencies of theenergy scales for ferromagnetic order and ferromagnetic spin fluctuations werefound to be identical.Comment: 5 page

Dilatometry study of the ferromagnetic order in single-crystalline URhGe