Observation of the Transition from Semiconductor to High-Tc Superconductor in (SnxEu1-x)yMo6S8 under High Pressure
Abstract
Pressure-induced high-temperature superconductivity is observed in semiconducting (SnxEu1-x)yMo6S8, where 0<=x<=0.1 and y=1.0 and 1.2, having a carrier concentration ~= 1019/cm3 at 4.2 K as determined from Hall-effect measurements. Above a threshold pressure ~= 7 kbar, superconductivity appears with dTcdP~=2 K/kbar. The maximum superconducting temperature (Tc~10 K), reached at ~ 12 kbar, represents the highest pressure-induced Tc in any semiconductor. For P>=13 kbar, the temperature-dependent resistance appears metallic.
- Publication:
-
Physical Review Letters
- Pub Date:
- January 1981
- DOI:
- 10.1103/PhysRevLett.46.280
- Bibcode:
- 1981PhRvL..46..280H
- Keywords:
-
- High Temperature;
- High Temperature Superconductors;
- Molybdenum Sulfides;
- Pressure Effects;
- Semiconductors (Materials);
- Transition Temperature;
- Critical Temperature;
- Europium Compounds;
- Hall Effect;
- Superconductivity;
- Temperature Dependence;
- Tin Compounds;
- Solid-State Physics;
- 74.70.Rv;
- 72.60.+g;
- Mixed conductivity and conductivity transitions