We report the effect of hydrostatic pressure on the electronic state of the antiferromagnet UIrGe, which is isostructural and isoelectronic with the ferromagnetic superconductors UCoGe and URhGe. A series of electrical resistivity measurements in a piston-cylinder-type cell and a cubic-anvil cell were performed at hydrostatic pressures up to 15 GPa. The Neel temperature decreases with increasing pressure. We constructed a p-T phase diagram and estimated the critical pressure pc, where the antiferromagnetism vanishes, as ∼12 GPa. The antiferromagnetic=paramagnetic transition appears to be first order. We suggest a scenario of competing antiferromagnetic inter-J- and ferromagnetic intra-J+-chain interactions in UIrGe. A moderate increase in the effective electron mass was detected in the vicinity of pc. A discussion of the electronic specific heat γ and electron-electron correlation term A using the Kadowaki-Woods relation is given.
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy