engleski

Giant paramagnetism in Li-doped Mo–S nanostructures

Magnetic measurements of Li-doped MoS2-y nanostructures show a peculiarly large T- independent paramagnetic signal, which cannot be understood in terms of either Curie- or Pauli paramagnetism, or-for that matter-in terms of any simple spin-correlated state, such as antiferromagnetism or superparamagnetic spin clustering. This behaviour appears to be a result of a near-ideal one-dimensional (1D) strongly correlated state, due to the extraordinarily weak inherent coupling between 1D subunits (nanotubes or nanowires), which is an order of magnitude weaker even than in carbon nanotube ropes. In spite of clear evidence for strong electronic correlations from a giant paramagnetic susceptibility, no transition to an ordered state is observed down to very low temperatures and the system appears to be stabilised in a paramagnetic state by fluctuations characteristic of ID systems. Down to 2 K there is no evidence of a low- temperature quantum critical point.

nanostructures ; magnetic properties

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