[seminar] Predavanje Prof. Mayaffre na FO

[hbuljan at phy.hr]

Postovani kolege,

iduću srijedu predavanje naslovljeno
"Quantum critical points and field induced phase transitions in quantum
spin systems: examples of NMR studies on spin ladders".
održati će nam Prof. Hadrien Mayaffre, s Joseph Fourier sveucilista
u Grenoblu. Predavanje pocinje 6. lipnja u 15h u sobi F201 na
Fizickom odsjeku PMFa.

Sazetak predavanja mozete vidjeti ovdje: http://nmr.phy.pmf.unizg.hr/
ili u nastavku poruke.

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"Quantum critical points and field induced phase transitions in quantum
spin systems: examples of NMR studies on spin ladders"

Prof. Hadrien Mayaffre
Universite Joseph Fourier, Grenoble

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
).

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