Abstract
We present the result of our accurate measurements of the a- and b-axis resistivity ( ρ a and ρ b ), magnetoconductivity Δ σ/ σ, Hall coefficient R H, and the a-axis thermopower S a in untwinned YBa 2Cu 3O y single crystals in a wide range of doping (6.45≤ y≤7.0). The systematics of our data reveals a number of novel 60-K-phase anomalies in the charge transport: (i) temperature dependences of ρ a show anomalous overlap below ∼130 K for 6.65≤ y≤6.80, (ii) Hall mobility μ H shows an enhancement near y≃6.65, which is reflected in an anomalous y dependence of σ xy , (iii) with decreasing temperature R H shows a marked drop upon approaching T c only in samples with 6.70≤ y≤6.85, (iv) superconducting fluctuation magnetoconductivity is anomalously enhanced near y≃6.7, and (v) H c2 is anomalously reduced near y≃6.70. We discuss that the fluctuating charge stripes might be responsible for these anomalies in the charge transport.
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