Superconducting Fluctuation Effects on the Spin-Lattice Relaxation Rate in YBa_2Cu_3O_{6.95}
V. F. Mitrovi{\'c}, H. N. Bachman, W. P. Halperin, M. Eschrig, J. A., Sauls, (Northwestern University) A. P. Reyes, P. Kuhns, W. G. Moulton,, (National High Magnetic Field Lab, Tallahassee)
TL;DR
This study investigates how superconducting fluctuations influence the spin-lattice relaxation rate in YBa2Cu3O6.95, revealing magnetic field-dependent effects linked to d-wave pairing fluctuations affecting the density of states.
Contribution
It provides experimental evidence of superconducting fluctuation effects on spin relaxation rates in a high-temperature superconductor under varying magnetic fields.
Findings
Spin-lattice relaxation rate increases with magnetic field below 120 K.
Field dependence attributed to low-energy spectral weight changes from pairing fluctuations.
Results support the role of superconducting fluctuations in the normal state.
Abstract
We report 63Cu(2) spin-lattice relaxation rate measurements of YBa_2Cu_3O_{6.95} in magnetic fields from 2.1 T to 27.3 T obtained from 17O(2,3) nuclear magnetic resonance spin-spin relaxation. For T < 120 K, the spin-lattice rate increases with increasing magnetic field. We identify this magnetic field dependence with the change in the low-energy spectral weight originating from d-wave pairing fluctuation corrections to the density of states.
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