Nearly Singular Magnetic Fluctuations in the Normal State of a High-T_c Cuprate Superconductor
Abstract
Polarized and unpolarized neutron scattering was used to measure the wave vector- and frequency-dependent magnetic fluctuations in the normal state (from the superconducting transition temperature, T_c=35, up to 350 K) of single crystals of La_{1.86}Sr_{0.14}CuO_4. The peaks which dominate the fluctuations have amplitudes that decrease as T^{-2} and widths that increase in proportion to the thermal energy, k_B T (where k_B is Boltzmann's constant), and energy transfer added in quadrature. The nearly singular fluctuations are consistent with a nearby quantum critical point.
- Publication:
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arXiv e-prints
- Pub Date:
- January 1998
- DOI:
- 10.48550/arXiv.cond-mat/9801169
- arXiv:
- arXiv:cond-mat/9801169
- Bibcode:
- 1998cond.mat..1169A
- Keywords:
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- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 4 color postscript figures