Spin-lattice relaxation time of conduction electrons in MgB2

TitleSpin-lattice relaxation time of conduction electrons in MgB2
Publication TypeJournal Article
Year of Publication2007
AuthorsSimon F, Muranyi F, Feher T, Janossy A, Forro L, Petrovic C, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Date PublishedJul
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000248496200112
KeywordsABSORPTION, aluminum, ESR SPECTROMETER, metals, RESONANCE, superconductivity

The spin-lattice relaxation time, T-1, of conduction electrons is measured as a function of temperature and magnetic field in MgB2 in the normal and superconducting states. 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 us to disentangle contributions from the two Fermi surfaces of MgB2, as this field restores the normal state on the part of the Fermi surface with pi symmetry only.

Alternate JournalPhys. Rev. B