Nuclear-spin noise
- 21 October 1985
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 55 (17), 1742-1745
- https://doi.org/10.1103/physrevlett.55.1742
Abstract
The spectral density of the Nyquist noise current in a tuned circuit coupled to a sample of nuclear spins has been measured at temperatures with a dc SQUID used as a rf amplifier. When the sample is in thermal equilibrium, a dip is observed in the spectral density at the Larmor frequency. For zero spin polarization, on the other hand, a bump in the spectral density is observed. This bump is due to temperature-independent fluctuations in the transverse component of magnetization, and represents spontaneous emission from the spins into the circuit.
Keywords
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