Magnetic field independence of the spin gap in YBa_2Cu_3O_{7-delta}
K. Gorny, O. M. Vyaselev, J. A. Martindale, V. A. Nandor, C. H., Pennington, (Department of Physics, Ohio State University) P. C. Hammel, W., L. Hults, J. L. Smith, (Los Alamos National Laboratory) P. L. Kuhns, A. P., Reyes
TL;DR
This study shows that the spin gap in YBa_2Cu_3O_{7-delta} remains unchanged under magnetic fields up to 14.8 Tesla, challenging previous findings and providing insights into the pseudogap phenomenon.
Contribution
The paper presents precise NMR measurements demonstrating the magnetic field independence of the spin gap in YBa_2Cu_3O_{7-delta}, contrasting prior results.
Findings
No magnetic field dependence of the spin gap observed
Implications for understanding the pseudogap in cuprates
Highlights experimental challenges in high-precision NMR measurements
Abstract
We report, for magnetic fields of 0, 8.8, and 14.8 Tesla, measurements of the temperature dependent ^{63}Cu NMR spin lattice relaxation rate for near optimally doped YBa_2Cu_3O_{7-delta}, near and above T_c. In sharp contrast with previous work we find no magnetic field dependence. We discuss experimental issues arising in measurements of this required precision, and implications of the experiment regarding issues including the spin or pseudo gap.
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