Conduction electron spin-lattice relaxation time in the MgB2 superconductor
Abstract
The spin-lattice relaxation time, T1, of conduction electrons is measured as a function of temperature and magnetic field in MgB2. The method is based on the detection of the z component of the conduction electron magnetization under electron spin resonance conditions with amplitude modulated microwave excitation. Measurement of T1 below Tc at 0.32 T allows to disentangle contributions from the two Fermi surfaces of MgB2 as this field restores normal state on the Fermi surface part with π symmetry only.
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