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Thermal expansion, electrical resistivity, magnetization, and specific heatmeasurements were performed on URu$_{2-x}$Fe$_{x}$Si$_{2}$ single crystals forvarious values of the Fe concentration $x$ in both the hidden order (HO) andlarge moment antiferromagnetic (LMAFM) regions of the phase diagram. Ourresults show that the paramagnetic (PM) to HO and LMAFM phase transitions aremanifested differently in the thermal expansion coefficient. For Feconcentrations near the boundary between the HO and LMAFM phases at $x_c$ ~0.1, we observe two features in the thermal expansion upon cooling, one thatappears to be associated with the transition from the PM to the HO phase andanother one at lower temperature that may be due to the transition from the HOto the LMAFM phase. These two features have not been observed in othermeasurements such as specific heat or neutron scattering. In addition, theuniaxial pressure derivative of the transition temperature, based on acalculation using thermal expansion and specific heat data, changesdramatically when crossing from the HO to the LMAFM phase.

Phase diagram and thermal expansion measurements on the system of URu_{2-x}Fe_xSi_2