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Recent experimental studies in URu$$_2$$Si$$_2$$

URu$$_2$$Si$$_2$$の最近の実験的研究

神戸 振作; 徳永 陽; 酒井 宏典; 青木 大*; Salce, B.*; Bourdarot, F.*; 松田 達磨*; 芳賀 芳範; Braithwaite, D.*; Flouquet, J.*; Brison, J.-P.*; Fisk, Z.; Walstedt, R. E.*

Kambe, Shinsaku; Tokunaga, Yo; Sakai, Hironori; Aoki, Dai*; Salce, B.*; Bourdarot, F.*; Matsuda, Tatsuma*; Haga, Yoshinori; Braithwaite, D.*; Flouquet, J.*; Brison, J.-P.*; Fisk, Z.; Walstedt, R. E.*

URu$$_2$$Si$$_2$$に関する最近の2つの実験研究を総括する。最初に一軸の圧力の下の熱膨張係数の温度依存を議論する。一軸圧力を[100]と[110]の方向に掛けた場合、隠れた秩序への転移温度は上昇するが、[110]のほうが、強く上昇する。また反強磁性秩序は[100]方向の場合、0.25GPaで現れるが、[110]の場合、0.6GPaまで現れなかった。29Si-NMRを用いて、隠れた秩序状態の2回対称性について見積もったところ、磁気トルク測定に比べて、小さいことがわかった。

Recent two experimental investigations in URu$$_2$$Si$$_2$$ will be presented. In first part, the temperature dependence of the thermal expansion coefficient $$alpha$$ will be presented in URu$$_2$$Si$$_2$$ under uniaxial pressure $$sigma$$ along the [100] and [110] directions up to $$sim0.6$$ GPa. For both cases, the hidden order phase transition temperature $$T_0$$ increases with increasing uniaxial pressure. An antiferromagnetically ordered phase appears at $$T_X$$ above the critical pressure $$sigma_Xsim0.25$$ GPa for uniaxial pressure along the [100] direction, whereas no antiferromagnetic transition is detected up to $$sim0.6$$ GPa for uniaxial pressure along the [110] direction, indicating that the critical pressure is beyond $$sim0.6$$ GPa for the [110] case. 2-fold intrinsic (mono-domain) susceptibility anisotropy in the basal plane, a value $$sim15$$ times smaller than that obtained from recent susceptibility measurements.

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