Magnetotransport properties of untwinned YBa2Cu3Oy single crystals: Novel 60-K-phase anomalies in the charge transport
Abstract
We present the result of our accurate measurements of the a- and b-axis resistivity (a and b), magnetoconductivity (σ / σ), Hall coefficient RH, and the a-axis thermopower Sa in untwinned YBa2Cu3Oy 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 a show anomalous overlap below ~130 K for 6.65 < y < 6.80, (ii) Hall mobility μH shows an enhancement near y ~ 6.65, which is reflected in an anomalous y dependence of σxy, (iii) With decreasing temperature RH shows a marked drop upon approaching Tc only in samples with 6.70 < y < 6.85, (iv) Superconducting fluctuation magnetoconductivity is anomalously enhanced near y ~ 6.7, and (v) Hc2 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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