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ЖУРНАЛЫ // Письма в Журнал экспериментальной и теоретической физики // Архив

Письма в ЖЭТФ, 2008, том 88, выпуск 11, страницы 867–872 (Mi jetpl308)

Эта публикация цитируется в 27 статьях

КОНДЕНСИРОВАННЫЕ СРЕДЫ

Hyperactivated resistance in TiN films on the insulating side of the disorder-driven superconductor-insulator transition

T. I. Baturinaa, A. Yu. Mironova, V. M. Vinokurb, M. R. Baklanovc, C. Strunkd

a Institute of Semiconductor Physics, Novosibirsk, 630090, Russia
b Material Science Division, Argonne National Laboratory, Argonne, Ill. 60439, USA
c IMEC, B-3001 Leuven, Belgium
d Institut für experimentelle und angewandte Physik, Universität Regensburg, D-93025 Regensburg, Germany

Аннотация: We investigate the insulating phase that forms in a titanium nitride film in a close vicinity of the disorder-driven superconductor-insulator transition. In zero magnetic field the temperature dependence of the resistance reveals a sequence of distinct regimes upon decreasing temperature crossing over from logarithmic to activated behavior with the variable-range hopping squeezing in between. In perpendicular magnetic fields below 2 T, the thermally activated regime retains at intermediate temperatures, whereas at ultralow temperatures, the resistance increases faster than that of the thermally activated type. This indicates a change of the mechanism of the conductivity. We find that at higher magnetic fields the thermally activated behavior disappears and the magnetoresistive isotherms saturate towards the value close to quantum resistance $h/e^2$.

PACS: 72.15.Rn, 73.50.-h, 74.40.+k, 74.78.-w

Поступила в редакцию: 28.10.2008

Язык публикации: английский


 Англоязычная версия: Journal of Experimental and Theoretical Physics Letters, 2008, 88:11, 752–757

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