Naslov
Observation of the Fermi Liquid Behavior in 122-Ironpnictides

Autori
Velebit, Kristijan ; Popčević, Petar ; Smontara, Ana ; Wu, D. ; M. Dressel, M. ; Cao, G. H. ; Xu, Z-A. ; Barišić, Neven

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstract book, Recent advances in broad-band solid-state NMR of correlated electronic systems (1 ; 2010 ; Trogir) / - , 2010, 68-68

Skup
Recent advances in broad-band solid-state NMR of correlated electronic systems

Mjesto i datum
Trogir, Hrvatska, 05.09.2010. - 10.09.2010

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Ba(Co0.08Fe0.92)2As2; Ba(Ni0.05Fe0.95)2As2; dc resistivity; Fermi liquid like behavior

Sažetak
Ab-plane dc resistivity have been measured in Ba(Co0.08Fe0.92)2As2 and Ba(Ni0.05Fe0.95)2As2 single crystals in a temperature range 4 - 600 K. In the normal state, the resistivtiy displays a power law (ρ(T)~T^n) dependence, with the exponent for n = 1.25 for Ba(Co0.08Fe0.92)2As2 and n=1.56 for Ba(Ni0.05Fe0.95)2As2. Such behavior is usually attributed to the underlying Quantum Critical Point (QCP). However, the analysis of the optical conductivity of several 122-pnictide compounds including the above ones, reveales two electronic subsystems (chanels), one of which is temperature independent. Upon determing the contribution of the two channels in dc resistivtiy, we find that the temperature- dependent channel exhibits a Fermi-liquid-like T^2 behavior The latter extends to unprecedented 380 K and 280 K in Co-doped and Ni-doped samples, respectively, and is followed by the saturation in resistivity at elevated temperatures. Both, the scattering rate in the Drude contribution to the optical conductivity, and the excellent agreement with Kadowaki-Woods relation independently confirm the Fermi-liquid-like behaviour and oppose the QCP scenario.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
The paper was presented at the first international workshop on "Recent advances in broad-band solid-state NMR of correlated electronic systems" (which is a part of the SOLeNeMaR project (FP7 #229390) of the European Commission (http://nmr.phy.hr/en/frontpage/98)) as a poster by Kristijan Velebit.

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