Pristupačnost
U srijedu 06.06. u 15:00 sati prof. dr. H. Mayaffre sa Sveučilišta J. Fourier u Grenobleu (Francuska) će održati seminar na Fizičkom odsjeku pod naslovom: "Quantum critical points and field induced phase transitions in quantum spin systems: examples of NMR studies on spin ladders" .
Sažetak predavanja:
"In many low dimensional quantum spin systems, as those based on antiferromagnetic spin dimers, the ground state is a nonmagnetic spin liquid. The application of a magnetic field leads to the destruction of this ground state. Beyond this quantum critical point the spin gap as disappeared and lower interactions can easily express them leading in many cases to a three-dimensional ordered state.
We will present, through some spin-ladder compounds, in which the phase diagram is easily accessible to experiment, examples where the magnetic field is used as an external parameter to tune the physics in these systems (quantum critical points, one-dimensional character, 3D-ordered state, effect of additional interactions…)."