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Random bond XXZ chains with modulated couplings

Cabra1, De Martino A, Grynberg

  • 1Departamento de Fisica, Universidad Nacional de la Plata, C.C. 67, (1900) La Plata, Argentina and Facultad de Ingenieria, Universidad Nacional de Lomas de Zamora, Cno. de Cintura y Juan XXIII, (1832) Lomas de Zamora, Argentina.

Physical Review Letters
|November 18, 2000
PubMed
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Disordered spin-1/2 Heisenberg chains show magnetization plateaus with binary disorder. Continuous disorder prevents these plateaus, impacting magnetic susceptibility in these quantum systems.

Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism
  • Disordered Systems

Background:

  • Investigating quantum spin chains is crucial for understanding emergent magnetic phenomena.
  • Disorder in exchange interactions significantly alters the properties of magnetic materials.

Purpose of the Study:

  • To explore the magnetization behavior of q-periodic antiferromagnetic spin-1/2 Heisenberg chains.
  • To analyze the impact of different types of disorder (binary vs. continuous) on magnetic properties.

Main Methods:

  • Real space decimation procedures were employed.
  • Numerical diagonalizations were performed on XX chains.

Main Results:

  • Binary disorder leads to wide magnetization plateaus at specific values (1+2(p-1)/q).

Related Experiment Videos

  • Continuous exchange distributions result in the absence of spin gaps.
  • Magnetic susceptibility was studied at low magnetic fields.

    • Conclusions:

    • The type of disorder critically determines the presence of magnetization plateaus in these quantum systems.
    • Understanding these behaviors is key for designing novel magnetic materials.