Paramagnetic Resonance as a Probe of the Spin Gap in Normal State of Superconductor | Zendy

Frank J. Owens | Zendy

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Paramagnetic Resonance as a Probe of the Spin Gap in Normal State of Superconductor

Author(s) -

Frank J. Owens

Publication year - 2011

Publication title -

isrn condensed matter physics

Language(s) - English

Resource type - Journals

eISSN - 2090-7400

pISSN - 2090-7397

DOI - 10.5402/2011/929713

Subject(s) - electron paramagnetic resonance , paramagnetism , spins , superconductivity , condensed matter physics , spin (aerodynamics) , resonance (particle physics) , ion , pulsed epr , chemistry , materials science , nuclear magnetic resonance , spin echo , atomic physics , physics , magnetic resonance imaging , medicine , organic chemistry , radiology , thermodynamics

It is shown that electron paramagnetic resonance (EPR) can be used to observe the spin gap in copper oxide superconductors. The electron paramagnetic resonance spectra of the Cu 2+ ion in underdoped show a pronounced decrease in intensity in the normal state as the temperature is lowered to 133 K, the superconducting transition temperature of the material. The decrease is attributed to a pairing of the Cu 2+ spins to form a spin gap. A spin gap of 0.0533 eV is estimated from the data which is in order of magnitude agreement with values obtained from NMR measurements.

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