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Thermodynamic study on non-centrosymmetric superconductor UIr by ac calorimetry under high pressure

Tateiwa, Naoyuki   ; Haga, Yoshinori  ; Matsuda, Tatsuma; Yamamoto, Etsuji  ; Ikeda, Shugo; Onuki, Yoshichika*

We investigated non-centrosymmetric compounds CePt$$_3$$Si and UIr by the ac heat capacity measurement under pressures. The pressure phase diagrams are determined. In CePt$$_3$$Si, the N$'e$el temperature $$T_{rm N}$$ = 2.2 K decreases with increasing pressure and becomes zero at the critical pressure $$P_{rm AF}$$ $$simeq$$ 0.6 GPa. On the other hand, the superconducting phase exists in a wider pressure region from ambient pressure to about 1.5 GPa. The phase diagram of CePt$$_3$$Si is thus very unique. In the ferromagnetic compound UIr where successive ferromagnetic transitions appear under pressure, the heat capacity shows an anomaly at the Curie temperature $$T_{rm C1}$$ and this anomaly shifts to lower temperatures with increasing pressure. The present pressure dependence of $$T_{rm C1}$$ was consistent with the previous works by the resistivity and magnetization measurements.

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Category:Physics, Multidisciplinary

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