Structural chemistry and magnetic behaviour of ternary uranium gallides U{Fe,Co,Ni,Ru,Rh,Pd,Os,Ir,Pt}Ga5

Thermodynamic and transport properties of single-crystallineUMGa5(M=Fe,Moreno1, Bauer2, Sarrao3 et al. 2005Phys. Rev. B334210View full textAdd to dashboardCite

“…Table I lists the room-temperature lattice parameters for all compounds. 14,22 It is worth noting that there is not a monotonic increase in the volume of the unit cell in the UMGa 5 series with increasing atomic radius of the M metal. Thus, the variation in volume cannot be described solely by simple size ͑evolution down a column͒ or electron count ͑evolution along a row͒ effects.…”

“…Only a weak temperature dependence is observed consistent with enhanced paramagnetic behavior arising from itinerant f electrons as noted previously. 14,15,18 Low temperature values are of the order 0 ϳ 10 −3 emu/ mol. Data for field applied along the c axis are essentially identical, and no strong magnetic anisotropy is observed.…”

“…X-ray powder diffraction measurements confirmed the HoCoGa 5 structure with lattice parameters in agreement with previous results. 14 The dc magnetic susceptibility ͑T͒ = M / H measurements were performed by means of a commercial superconducting quantum interference device ͑SQUID͒ magnetometer ͑Quan-tum Design͒ in fields of 1 kOe in the temperature range 2 -350 K. Heat capacity C p ͑T͒ measurements were carried out using the thermal relaxation technique with a commercial calorimeter in the temperature range 0.5-300 K. The electrical resistivity ͑T͒ was measured in a commercial 4 He cryostat, using a four-probe ac technique in the temperature range of 1.8-300 K under zero applied field. Bar-shaped samples were cut along the principal axes, and a current was applied along the ͓100͔ direction.…”

“…20 The initial description of the UMGa 5 compounds reported only a structural determination and magnetic susceptibility data at temperatures above 80 K on principally polycrystalline samples. 14 Subsequent studies have revealed that UNiGa 5 , UPtGa 5 , and UPdGa 5 order antiferromagnetically; [21][22][23] whereas, itinerant paramagnetic behavior is observed for the UMGa 5 materials with other transition metals. Significant recent effort has been devoted to understanding the nature of the ordered compounds as well as to the evolution of the Fermi surface across many of these compounds as a function of transition metal.…”

Electronic Structure and the Fermi Surface ofPuCoGa5and

“…Note, however, that superconductivity occurs for M=Ir (T c =0.4K) and Co (2.3K) in CeMIn 5 , while antiferromagnetic (AFM) phase has been found for M=Rh at ambient pressure. Another isostructural material including uranium is UMGa 5 [4], but superconductivity has not been found yet. These HoCoGa 5 -type compounds are frequently referred to as "115".…”