The Hall effect has been measured at 77 K in La2-xSrxCuO4 for the range of x in which high-temperature superconductivity is observed. Below x=0.15 1/RH increases linearly with x consistent with one itinerant hole per Sr atom. (The carrier density is 2.1×1021 cm-3 at x=0.15 where the superconducting transition temperature is a maximum.) Between 0.15 and 0.18 RH drops by a factor of 30, remaining undetectable for larger x. Proposed charge-density-wave models are in conflict with the data.
ASJC Scopus subject areas
- Condensed Matter Physics