| Issue |
Europhys. Lett.
Volume 57, Number 2, January 2002
|
|
|---|---|---|
| Page(s) | 267 - 273 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00571-0 | |
| Published online | 01 September 2002 | |
Two mechanisms of pseudogap formation in Bi-2201: Evidence from the c-axis magnetoresistance
Central Research Institute of Electric Power Industry
2-11-1 Iwato-kita, Komae, Tokyo 201-8511, Japan
Received:
14
June
2001
Accepted:
26
October
2001
Measurements of the c-axis resistivity and magnetoresistance have been
used to investigate the pseudogap (PG) behavior in
Bi
Sr
LaxCuOy (Bi-2201) crystals at various hole
densities. While the PG opening temperature T* increases with
decreasing hole doping, the magnetic-field sensitivity of the PG is
found to have a very different trend: it appears at lower
temperatures in more underdoped samples and vanishes in
non-superconducting samples. These data suggest that besides the
field-insensitive pseudogap emerging at T*, a distinct one is formed
above 
as a precursor to superconductivity.
PACS: 74.25.Fy – Transport properties (electronic and thermal conductivity) / 74.20.Mn – Non-conventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.72.Hs – Bi-based cuprates
© EDP Sciences, 2002
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