Naslov
Pressure Induced Superconductivity in Pristine 1T-TiSe_2

Autori
Kusmartseva, A.F. ; Sipos, B. ; Berger, H. ; Forro, Laszlo ; Tutiš, Eduard

Izvornik
Physical Review Letters (0031-9007) 103 (2009), 23; 236401-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
charge-density wave; superconductivity; pressure; excitonic insulator; quantum critical point

Sažetak
The interplay between superconductivity and the charge-density wave (CDW) state in pure \mbox 1T-TiSe_2 is examined through a high pressure study extending up to pressures of 10~GPa between sub-Kelvin and room temperatures. At a critical pressure of 2~GPa a superconducting phase sets in and persists up to pressures of 4~GPa. The maximum superconducting transition temperature is 1.8~K. These findings complement the recent discovery of superconductivity in copper-intercalated 1T-TiSe_2. In both cases the superconductivity is limited to a region where the CDW fluctuations are enhanced, with the superconducting dome surrounding the CDW quantum critical points. However, the comparisons of the normal state and superconducting properties of the two systems reveal the possibility that the emergent electronic state qualitatively depends on the manner in which the CDW state is destabilized, making this an unique example where two different superconducting domes are obtained by two different methods from the same parent compound.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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