β Scribed by Yonathan Shapir; Serge Galam
No coin nor oath required. For personal study only.
The interplay between disorder and compressibility in Ising magnets is studied. Contrary to pure systems in which a weak compressibility drives the transition first order, we find from a renormalization group analysis that it has no effect on disordered systems which keep undergoing continuous transition with rigid random-bond Ising model critical exponents. The mean field calculation exhibits a dilution-dependent tricritical point beyond which, at stronger compressibility, the transition is first order. The different behavior of XY and Heisenberg magnets is discussed.
π SIMILAR VOLUMES
We report measurements of temperature dependent heat capacity, thermal expansion and high resolution X-ray diffraction (XRD) taken on single crystals of Sm 2 IrIn 8 intermetallic compound. This compound belongs to the R m M n In 3mΓΎ2n family (R ΒΌ rare earth, m ΒΌ 1, 2, n ΒΌ 0, 1 and M ΒΌ Rh, Ir and Co)