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Conduction electron spin-lattice relaxation time in the MgB2 superconductor

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arxiv 0704.0466 v1 pith:BCORMLNH submitted 2007-04-03 cond-mat.supr-con cond-mat.str-el

Conduction electron spin-lattice relaxation time in the MgB2 superconductor

F. Simon , F. Mur\'anyi , T. Feh\'er , A. J\'anossy , L. Forr\'o , C. Petrovic , S.L. Bud'ko , P.C. Canfield This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords conductionelectronfermifieldrelaxationspin-latticetimeallows
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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