Superconducting Fluctuation Effects on the Electron Spin Susceptibility in YBa_2Cu_3O_{6.95}
H. N. Bachman, V. F. Mitrovi{\'c}, A. P. Reyes, W. P. Halperin, M., Eschrig, J. A. Sauls, (Northwestern University) A. Kleinhammes, P. Kuhns, W., G. Moulton, (National High Magnetic Field Lab, Tallahassee)
TL;DR
This study uses high-precision 17O NMR to investigate how superconducting fluctuations influence the electron spin susceptibility in YBa_2Cu_3O_{6.95}, revealing a smooth crossover from normal to vortex liquid states and mapping a curved phase diagram.
Contribution
It provides detailed experimental evidence of superconducting fluctuation effects on spin susceptibility and establishes a magnetic field-temperature phase diagram for YBa_2Cu_3O_{6.95}.
Findings
Superconducting fluctuations cause a smooth crossover in susceptibility.
A magnetic field-temperature phase diagram with strong upward curvature was mapped.
High-precision 17O NMR measurements captured the crossover behavior.
Abstract
The electronic spin susceptibility of YBa_2Cu_3O_{6.95} has been measured with high precision up to 24 Tesla with 17O nuclear magnetic resonance. Its temperature dependence can be accounted for by superconducting fluctuations that result in a smooth crossover from the normal to the vortex liquid state. A magnetic field-temperature phase diagram for this crossover has been established having strong upward curvature.
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