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Despite several decades of both experimental and theoretical work the natureof the hidden order transition at THO = 17.5 K in URu2Si2 remains enigmatic. Wereport here low field DC magnetization as well as AC susceptibilitymeasurements performed on single crystals with field along the c-axis. A peakin the first order AC susceptibility is observed at T=16 K in close proximityto the well known change in slope at THO=17.5 K. Third order susceptibilitymeasurements on the other hand reveal a signature only at 16 K with nodiscernible change at THO. However, both transitions are visible in the fifthorder susceptibility. A signature at this lower transition, as a spontaneousferromagnetic signal, also appears in low field DC magnetization measurements.A similar but larger ferromagnetic response appears at T~35 K. Both theseferromagnetic signatures are suppressed in a small field (B ~ 40 Gauss||c-axis). The close proximity of the lower signature to the hidden ordertransition and the simultaneous presence and suppression of a ferromagneticsignature at 35 K could be due to the removal of degeneracy in the complexorder-parameter of the hidden order transition due a "symmetry breaking field",at least locally within the crystals of URu2Si2.

Low Field Magnetic Susceptibility and the Hidden Order Transition in URu2Si2