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  • Magnetic coupling and low-energy excitations in ▫$NdGa_2$▫ studied by ESR
    Dolinšek, Janez, 1957- ...
    Magnetic coupling and low-energy excitations of ▫$NdGa_2$▫ were studied by electron spin resonance (ESR) and magnetic-susceptibility measurements between room temperature and 4 K. Only the ... conduction-electron ESR resonance was detected, whereas the f-electron resonances, due to the effects of the crystalline electric field and the sf indirect exchange interactions, are shifted outside the range of the X-band ESR experiment. In the high-temperature regime between 300 and 100 K the ESR succeptibility appears as Pauli-like whereas below 100 K it shows an enhacement due to the sf exchange and follows the temperature dependence on the Curie-Weiss-type f-electron magnetic susceptibility. The f-electron magnetism is observed indirectly via the enhancement effect on the conduction electrons, demonstrating the importance of the exchange interactions in ▫$NdGa_2$▫. Magnetization measurements with a superconducting quantum interference device magnetometer have demonstrated that the nature of the reported ferromagnetic component below 5 K is not that of a true ferromagnet. Rather, the magnetization is field induced and decays to zero after switching off the external magnetic field. A nonresonant microwave absorption, reported previously for canted antiferromagnets, was observed in the antiferromagnetic phase.
    Vir: Physical review. B, Condensed matter. - ISSN 0163-1829 (Let. 60, št. 10, 1999, str. 7346-7351)
    Vrsta gradiva - članek, sestavni del
    Leto - 1999
    Jezik - angleški
    COBISS.SI-ID - 9124441

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