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Metamagnetic quantum criticality in metals.

A J Millis1, A J Schofield, G G Lonzarich

  • 1Center for Materials Theory, Department of Physics, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA.

Physical Review Letters
|June 13, 2002
PubMed
Summary

We studied quantum criticality in metals using renormalization group methods. Our findings reveal a specific universality class for clean systems, matching experimental data for Sr3Ru2O7.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Critical Phenomena
  • Materials Science

Background:

  • Metamagnetic quantum criticality in metals is a complex phenomenon.
  • Understanding the theoretical framework governing these transitions is crucial for materials science.

Purpose of the Study:

  • To apply renormalization group (RG) methods to investigate metamagnetic quantum criticality in clean metallic systems.
  • To determine the universality class and predict the behavior of physical quantities near the critical point.

Main Methods:

  • Renormalization group (RG) treatment applied to clean metallic systems.
  • Analysis of the field and temperature dependence of key physical quantities.

Main Results:

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  • Identified the universality class as the overdamped, conserving (dynamical exponent z = 3) Ising type for clean systems.
  • Derived detailed predictions for differential susceptibility, resistivity, and specific heat.
  • Achieved quantitative agreement with experimental data for Sr3Ru2O7, with minor deviations near the critical point.

    • Conclusions:

    • The renormalization group framework successfully describes metamagnetic quantum criticality in clean metals.
    • The predicted universality class and physical quantity behaviors align well with experimental observations in materials like Sr3Ru2O7.