We reported on our nuclear magnetic resonance experiments in Cs3C60 and first demonstrated that its ambient pressure ground state is insulating with an antiferromagnetic order below 46 K. This insulating state has all characteristics of Mott insulators and thus clearly reflects the importance of electronic correlations in fullerides. Applying high hydrostatic pressures (exceeding 3.6 kbar) Cs3C60 becomes a metal and undergoes to a superconducting state at low temperatures. Critical temperature first increases with increasing pressure, but then reaches a broad maximum at TC = 38 K at 8 kbar.
COBISS.SI-ID: 22509351
In case of two-dimensional highly frustrated system FeTe2O5Br, a three dimensional magnetic order sets in below the Néel temperature TN = 11 K. The magnetic structure was solved by means of neutron diffraction and nuclear magnetic resonance experiments. We found that the magnetic order is incommensurate where Fe2+ magnetic moments with fixed direction vary periodically in magnitude, in clear contrast to the spiral magnetic structures. The presence of such a magnetic structure breaks the inversion symmetry and opens the possibility for the coexisting ferroelectric order.
COBISS.SI-ID: 22946087
We have reported anisotropic physical properties (the magnetic susceptibility, the electrical resistivity, the thermoelectric power, the Hall coefficient and the thermal conductivity) of the o-Al13Co4 complex metallic alloy that is an orthorhombic approximant to the decagonal quasicrystal. The crystallographic-direction-dependent measurements were performed along the a, b and c directions of the orthorhombic unit cell.
COBISS.SI-ID: 22595879
Natural mineral azurite, Cu3(CO3)2(OH)2, is a model compound for the distorted diamond antiferromagnetic spin-1/2 chain. By means of nuclear magnetic resonance, M. Klanjšek with colleagues from LNCMI, Grenoble, studied the magnetic structure in the large plateau extending from 11 to 30 T, which corresponds to 1/3 of the saturation magnetization.
COBISS.SI-ID: 22562855