28 research outputs found
Electrical resistivity across the tricriticality in itinerant ferromagnet
We investigate the discontinuous ferromagnetic phase diagram near tricritical
point in UCo 1-x Ru x Al compounds by electrical resistivity measurements.
Separation of phases in UCo 0.995 Ru 0.005 Al at ambient pressure and in UCo
0.990 Ru 0.010 Al at pressure of 0.2 GPa and disappearance of ferromagnetism at
0.4 GPa is confirmed. The exponent of temperature dependence of electrical
resistivity implies change from Fermi liquid behavior to non-Fermi liquid at
0.2 GPa and reaches minimum at 0.4 GPa. Our results are compared to results
obtained on the pure UCoAl and explanation for different exponents is given
Neutron Diffraction Study on Single-crystalline UAuSi
Magnetic structure of tetragonal UAuSi was investigated by
single-crystal neutron diffraction experiments. Below = 20 K it
orders antiferromagnetically with a propagation vector of and
magnetic moments of uranium ions pointing along the tetragonal -axis. Weak
signs of the presence of a ferromagnetic component of magnetic moment were
traced out.Taking into account a group theory calculation and experimental
results of magnetization and Si-NMR, the magnetic structure is
determined to be a squared-up antiferromagnetic structure, with a stacking
sequence () of the ferromagnetic -plane sheets along the -axis.
This result highlights similar magnetic correlations in UAuSi and
isostructural URuSi.Comment: 7 pages, 7 figure