Naslov
Localized superconductivity in TiN thin films

Autori
Bilusic, Ante ; Baturina, Tatyana ; Mironov, Aleksey ; Otto, Florian ; Baklanov, Mikhail ; Strunk, Christoph

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

Izvornik
72. Jahrestagung der DPG und DPG Frühjahrstagung des Arbeitskreises Festkörperphysik, Berlin, SR Njemačka, 25.-29.02.2008. / - , 2008

Skup
72. Jahrestagung der DPG und DPG Frühjahrstagung des Arbeitskreises Festkörperphysik

Mjesto i datum
Berlin, Njemačka, 25.02.2008. - 29.02.2008

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
superconductor-insulator transition; Josephson junctions; Coulomb blockade

Sažetak
We present a low-temperature investigation of transport and magnetic properties of TiN thin films in the critical region of the disorder driven superconductor-insulator transition (SIT). At zero magnetic field, the superconducting and insulating phases are sharply separated, indicating the absence of the intermediate metallic state in the SIT. Electrical conductivity of the insulating films is thermally activated. films closer to the critical level of disorder show a huge positive magnetoresistance (MR) at low, and a negative MR for high fields. Films being deeper on the insulating side of the SIT critical region exhibit negative MR only. At low temperatures, differential conductance curves of insulating samples show a depinning threshold VT , below which the conductance is immeasurably small. Threshold VT depends in a nonmonotonic way on magnetic field. This can be explained in terms of recent theory [1], which relies on the competition of Coulomb charging and Josephson coupling in arrays of Josephson junctions. [1] M. V. Fistul, V. M. Vinokur, and T. I. Baturina, arXiv:0708.2334v2 (unpublished)

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA