INVESTIGADORES
BRIDOUX German
congresos y reuniones científicas
Título:
Evolution of Fermi surface sheets and multiple critical fields in bulk SrTiO3
Autor/es:
K. BEHNIA; X. LIN; B. FAUQUE; A. GOURGOUT; G. BRIDOUX
Lugar:
Paris
Reunión:
Conferencia; Topology, Correlations and Interfaces in Quantum Matter- TOPINCOR 2013; 2013
Resumen:
In
1964, SrTiO3 became the first oxide known to become superconductivity. Decades
later, this very restrictive club includes two other members, the cuprate
family of high-temperature superconductors and Sr2RuO4. We present an
experimental study of the normal and superconducting states in SrTiO3 focused
on a quantitative determination of the Fermi surface sheets and the
superconducting gaps. Below a critical doping, superconductivity survives in a
single-band context, making the system, by far, the most dilute superconductor
known yet. When the carrier density is a thousand times larger ( i.e. near optimal
doping), thermal conductivity detects the presence of multiple gaps by finding
a characteristic field much smaller than the upper critical field. We argue
that superconducting gaps detected by thermal conductivity and Fermi surface
components detected by quantum-oscillation measurements can be linked to each
other.