Naslov
Doping effects on charge density wave state in o-TaS3

Autori
Dominko, Damir ; Starešinić, Damir ; Biljaković, Katica ; Lunkenheimer, Peter ; Loidl, Alois ; Lasjaunias, Jean Claude

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

Izvornik
American Physical Society, APS March Meeting / - : APS, 2009

Skup
March Meeting 2009

Mjesto i datum
Pittsburgh (PA), Sjedinjene Američke Države, 16.03.2009. - 20.03.2009

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
doping charge density waves

Sažetak
We present the effects of the isoelectronic supstitution of Ta by (0.2 and 0.5 %) Nb atoms on the charge density wave (CDW) properties in o-TaS3. The characteristic, primary relaxation process which gives the maximum in the dielectric constant near 100 K disappears with slight doping. At the same time the minimum in threshold field in the same temperature range disappears as well, which is expected from well known relation between ET and low frequency dielectric constant [1]. This implies that the primary process it mainly due to polarization on order of domain scale, which decreases by doping. The secondary process, on the other hand, as well as low energy excitation contribution to specific heat (CLEE), seem to be unchanged. Only the amplitudes of the two are increased [1, 2], as both are due to the local excitations of the CDW phase in vicinity of defects described by two level system (TLS) model. [1] Staresinic et. al, Phys. Rev. B, 65, 165109 (2002) [2] Biljakovic et. al, Europhys. Lett., 62 (4), pp. 554--560 (2003)

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA