Physics – Condensed Matter – Superconductivity
Scientific paper
2001-08-03
Phys. Rev. Lett. 88, 167005 (2002).
Physics
Condensed Matter
Superconductivity
4 pages, 6 figures (including one color figure), final version accepted for publication in PRL. The paper now emphasizes that
Scientific paper
10.1103/PhysRevLett.88.167005
Magnetoresistance (MR) in the a-axis resistivity of untwinned YBa_{2}Cu_{3}O_{y} single crystals is measured for a wide range of doping (y = 6.45 - 7.0). The y-dependence of the in-plane coherence length \xi_{ab} estimated from the fluctuation magnetoconductance indicates that the superconductivity is anomalously weakened in the 60-K phase; this gives evidence, together with the Hall coefficient and the a-axis thermopower data that suggest the hole doping to be 12% for y = 6.65, that the origin of the 60-K plateau is the 1/8 anomaly. At high temperatures, the normal-state MR data show signatures of the Zeeman effect on the pseudogap in underdoped samples.
Ando Yoichi
Segawa Kouji
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