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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Resistance minimum and heavy fermions.

Kondo Jun

    Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
    |March 21, 2015
    PubMed
    Summary
    This summary is machine-generated.

    The s-d interaction model explains the resistance minimum in dilute magnetic alloys by considering electron scattering off magnetic impurities. This model also accounts for large electronic specific heat and non-magnetic behavior in certain rare earth and uranium compounds.

    Keywords:
    Kondo effectResistance minimumheavy fermionmagnetic impuirity

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    Area of Science:

    • Condensed matter physics
    • Materials science

    Background:

    • Dilute magnetic alloys exhibit a resistance minimum phenomenon.
    • Certain intermetallic compounds with rare earth elements or uranium display large electronic specific heat and Curie-like susceptibility.
    • These materials often remain non-magnetic despite high-temperature magnetic susceptibility.

    Purpose of the Study:

    • To explain the resistance minimum phenomenon in dilute magnetic alloys.
    • To elucidate the behavior of intermetallic compounds involving rare earth elements and uranium.
    • To demonstrate the applicability of the s-d interaction model to these complex magnetic phenomena.

    Main Methods:

    • Theoretical explanation based on the s-d interaction model.
    • Consideration of conduction electron scattering off magnetic impurities.
    • Analysis of electronic specific heat and magnetic susceptibility data.

    Main Results:

    • The s-d interaction model successfully explains the resistance minimum in dilute magnetic alloys.
    • The model accounts for the large electronic specific heat observed in specific intermetallic compounds.
    • The model also explains why these compounds remain non-magnetic at low temperatures despite high-temperature susceptibility.

    Conclusions:

    • The s-d interaction is a key mechanism governing the magnetic properties of dilute magnetic alloys and certain intermetallic compounds.
    • The model provides a unified framework for understanding diverse magnetic phenomena in these materials.
    • Further investigation into s-d interactions can lead to the development of novel magnetic materials.