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Thermal expansion under uniaxial pressure in URu$$_2$$Si$$_2$$, 2

Kambe, Shinsaku  ; Aoki, Dai*; Salce, B.*; Bourdarot, F.*; Braithwaite, D.*; Flouquet, J.*; Brison, J. P.*

It experimented about the 1 axis pressure dependence of order transition temperature T$$_0$$ in which URu$$_2$$Si$$_2$$ hid, and antiferromagnetic order T$$_N$$. 2$$times$$2$$times$$4 mm of quality single crystals were used. In order to detect the hidden order and antiferromagnetic order transition, the thermal expansion coefficient was measured using the string gauge. The 1 axis pressure sigma performed measurement to [100], the [110] directions, and 0.6 GPa using the system which can change pressure continuously at low temperature using He gas. Under hydrostatic pressure, although T$$_N$$ appeared from about 0.5 GPa, with the 1 axis of [100] direction pressure, it turned out that it appears from about 0.25 GPa. Moreover, T$$_0$$ is also going up. This consistents withas a result of neutron scattering. On the other hand, in the case of [110], T$$_N$$ was not able to be observed to 0.6 GPa.

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