[seminar] Seminar FO , Klanjšek

[Hrvoje Buljan]

Poštovani kolege,

podsjećam na današnje predavanje dr. Klanjšeka.

Srdačan pozdrav,
Hrvoje Buljan

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SEMINAR FIZIČKOG ODSJEKA
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Vrijeme:   utorak, 04. 05. 2010., 14:15 sati (točno)
Mjesto:     Fizički odsjek, Bijenička c. 32, predavaonica F08

   Nuclear magnetic resonance in spin Luttinger liquids

                  Dr. Martin Klanjšek
      Institut Jožef Stefan, Ljubljana, Slovenija

Effective low-energy description of interacting quantum particles in one
dimension is called a Luttinger liquid (LL). Its main property is the
existence of gapless excitations characterized by correlation functions
decaying as power laws, with exponents being simple functions of the
dimensionless exponent K. The physics of a LL is quite elegant as it is
directed by two LL parameters only: exponent K and velocity of excitations
u. Chains and ladders of antiferromagnetically coupled electronic spins
are examples of LL's. Nuclear magnetic resonance (NMR) is a precise probe
for the lattice dynamics on the frequency scale of 100 MHz, which
coincides with the low-frequency part of electron spin fluctuations in
spin systems. As such, NMR is an ideal tool for probing the spin LL
physics in model materials. In the talk I will present recent results of
NMR studies on two model materials: spin-ladder compound CuBr4(C5H12N)2
and spin-chain compound BaCo2V2O8. I will focus on several observables
accessible by NMR (transition temperature, order parameter, electron spin
fluctuations) in relatively rich phase diagrams of both model materials.

 				Voditelj seminara FO
 				Hrvoje Buljan, hbuljan at phy.hr
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