Regensburg 2002 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HL: Halbleiterphysik

HL 18: Symposium: Physics in High Magnetic Fields

HL 18.2: Fachvortrag

Dienstag, 12. März 2002, 15:00–15:30, H15

Low temperature Hall effect in the normal state of single-layer high-Tc — •Greg Boebinger — National High Magnetic Field Laboratory, Los Alamos National Laboratory, M/S E536, Los Alamos, NM 87545 USA

The normal-state Hall coefficient of BSLCO suggests a crossover between two ground states as the carrier concentration is varied from the overdoped to underdoped regimes by partially substituting Sr with La in a series of samples. The Hall coefficient is measured down to 0.5K by suppressing the superconducting phase with a 60T pulsed magnetic field. The observed saturation of the Hall coefficient at low temperatures suggests the ability to conventionally extract the carrier concentration of each sample. The Hall number exhibits a sharp peak near optimal doping, providing evidence for the existence of a phase boundary near optimal doping. The most underdoped sample exhibits a diverging Hall coefficient at low temperatures, consistent with a depletion of carriers in the insulating ground state.

A collaboration with F.F. Balakirev, J.B. Betts (Los Alamos National Laboratory); S. Ono, T. Murayama and Yoichi Ando (Central Research Institute of Electric Power Industry and the Science University of Tokyo).