Conduction electron spin-lattice relaxation time in the MgB2 superconductor

Details Conduction electron spin-lattice relaxation time in the MgB2 superconductor Conduction electron spin-lattice relaxation time in the MgB2 superconductor

2007-04-03

arxiv.org/abs/0704.0466v1

Phys. Rev. B 75, 024519 (2007)

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.76.024519

The spin-lattice relaxation time, $T_{1}$, of conduction electrons is measured as a function of temperature and magnetic field in MgB$_2$. 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 $T_{1}$ below $T_c$ at 0.32 T allows to disentangle contributions from the two Fermi surfaces of MgB$_{2}$ as this field restores normal state on the Fermi surface part with $\pi$ symmetry only.

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