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Quantum Hall effects in layered disordered superconductors.

V Kagalovsky1, B Horovitz, Y Avishai

  • 1Negev Academic College of Engineering, Beer-Sheva 84100, Israel.

Physical Review Letters
|February 9, 2005
PubMed
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This study explores layered superconductors, revealing a phase diagram with charge-spin separation. Researchers identified distinct quantum Hall and spin metal phases, crucial for understanding novel electronic behaviors.

Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Layered superconductors with broken time-reversal symmetry exhibit complex electronic behaviors.
  • Understanding charge-spin separation is key to developing advanced electronic devices.

Purpose of the Study:

  • To investigate the phase diagram of layered singlet superconductors with disorder and broken time-reversal symmetry.
  • To analyze the transport properties and identify different quantum phases, including quantum Hall and spin metal phases.

Main Methods:

  • Theoretical study of layered singlet paired superconductors.
  • Analysis of transport phenomena in terms of intergrain transmission and interlayer tunneling.
  • Identification of spin Hall coefficients and localization exponents.

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Main Results:

  • Demonstrated a phase diagram featuring charge-spin separation.
  • Identified quantum Hall phases with spin Hall coefficients sigma(spin)(xy)=0,2, separated by a spin metal phase.
  • Determined a spin metal-insulator localization exponent and a spin conductivity exponent of approximately 0.96.
  • Observed an additional sigma(spin)(xy)=1 phase in the presence of a Zeeman term.

Conclusions:

  • The study elucidates the complex phase diagram of disordered layered superconductors with broken time-reversal symmetry.
  • The findings highlight the existence of distinct quantum Hall and spin metal phases, offering insights into charge-spin separation.
  • The identification of specific exponents and the influence of the Zeeman term provide a deeper understanding of electron behavior in these systems.