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Related Experiment Videos

Local defect in metallic quantum critical systems.

A J Millis1, D K Morr, J Schmalian

  • 1Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.

Physical Review Letters
|November 3, 2001
PubMed
Summary
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Defects near quantum critical points nucleate spin droplets, suppressing quantum tunneling. A proposed NMR experiment can measure these impurity-induced spin susceptibility changes.

Area of Science:

  • Condensed matter physics
  • Quantum criticality
  • Defect physics

Background:

  • Quantum critical points (QCPs) are central to understanding phases of matter.
  • Defects can significantly alter the behavior of systems near QCPs.
  • The interplay between defects and metallic systems at criticality is not fully understood.

Purpose of the Study:

  • To develop a theoretical framework for defects interacting with order parameters near QCPs.
  • To investigate the formation and properties of defect-induced spin droplets.
  • To propose an experimental method for detecting these phenomena.

Main Methods:

  • Theoretical analysis of a defect coupling to the order parameter squared.
  • Investigation of systems at or above their upper critical dimension.

Related Experiment Videos

  • Formulation of a nuclear magnetic resonance (NMR) experiment.

    • Main Results:

    • A theory describing defect-induced spin droplet nucleation at criticality.
    • Identification of a universal slowly decaying tail of the spin droplet.
    • Prediction of complete suppression of quantum tunneling due to dissipative channels.
    • Proposal for measuring impurity-induced changes in local spin susceptibility via NMR.

    Conclusions:

    • Single point, line, or plane defects can fundamentally alter metallic systems near QCPs.
    • Spin droplet formation around defects leads to unique physical properties.
    • NMR spectroscopy offers a viable method to experimentally probe these defect-induced effects.