[seminar] Podsjetnik na DANASNJI seminar na IF-u u 15:00h

[Osor Barisic]

Poštovani, 





podsjećamo Vas na današnji seminar na Institutu za fiziku u 15:00 sati: 





Institut za fiziku, Bijenička cesta 46, 

predavaonica u zgradi Mladen Paić četvrtak, 23. listopada 2014., u 15:00 sati 

What is the origin of anomalous dielectric response in layered organic crystals? 

Silvia Tomić 
Institute of Physics, Zagreb, Croatia 





Novel forms of the low-temperature phases in the two-dimensional molecular solids with competing interactions between charges, spins and lattice, in particular those featuring anomalous dielectric relaxation, have been the focus of intense activity in recent years. Open issues concern the nature of collective charge excitations as well as their coupling to applied ac and dc electric fields. T he charge response is reasonably well understood b y now in the charge-ordered phase with the formation of ferroelectric-like domains below the metal-to-insulator phase transition [1, 2]. Conversely, the dielectric response observed in dimer Mott insulator phases with no charge ordering is rather intriguing [3, 4, 5 ]. In this presentation we review our recent results of anisotropic complex conductivity (dc – MHz) in the magnetic phase of kappa-(BEDT-TTF) 2 Cu[N(CN) 2 ]Cl and in the spin-liquid phase of kappa-(BEDT-TTF) 2 Cu 2 (CN) 3 [6, 7, 8]. We discuss possible explanations for the observed dynamics and compare them with the well-known fingerprints of the charge/spin density wave response to ac electric fields. 


[1] T. Ivek et al., Phys.Rev.B83, 165128 (2011). 
[2] T. Ivek et al., Phys.Rev.B86, 245125 (2012). 
[3] M. Abdel-Jawad et al., Phys.Rev.B82, 125119 (2010). 
[4] S. Iguchi et al., Phys.Rev.B87, 075107 (2013). 
[5] P. Lunkenheimer et al., Nat. Mater. 11, 755 (2012). 
[6] S. Tomic et al., J.Phys.: Condens.Matter 25, 436004 (2013). 
[7] M. Pinteric et al., submitted to Phys.Rev.B (2014) 
[8] M. Pinteric et al., to be published in Physica B (2014). 

Voditelji seminara IF-a: Nikša Krstulović i Osor Bari šić 

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