Magnetic Field Independence of the Spin Gap in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi mathvariant="italic">δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Krzysztof GórnyDepartment of Physics, The Ohio State University, 174 W. 18th Avenue, Columbus, Ohio 43210O. M. VyaselevDepartment of Physics, The Ohio State University, 174 W. 18th Avenue, Columbus, Ohio 43210J. A. MartindaleDepartment of Physics, The Ohio State University, 174 W. 18th Avenue, Columbus, Ohio 43210V. A. NandorDepartment of Physics, The Ohio State University, 174 W. 18th Avenue, Columbus, Ohio 43210C. H. PenningtonDepartment of Physics, The Ohio State University, 174 W. 18th Avenue, Columbus, Ohio 43210P. C. HammelLos Alamos National Laboratory, Los Alamos, New Mexico 87545W. L. HultsLos Alamos National Laboratory, Los Alamos, New Mexico 87545J. L. SmithLos Alamos National Laboratory, Los Alamos, New Mexico 87545P. L. KuhnsNational High Magnetic Field Laboratory, Tallahassee, Florida 32310A. P. ReyesNational High Magnetic Field Laboratory, Tallahassee, Florida 32310W. G. MoultonNational High Magnetic Field Laboratory, Tallahassee, Florida 32310
1999lv
ABI
Annotatsiya
We report, for magnetic fields of 0, 8.8, and 14.8 T, measurements of the temperature dependent ${}^{63}\mathrm{Cu}$ NMR spin lattice relaxation rate for near optimally doped ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$, 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 gap or pseudogap.
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