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Spin pseudogap in Ni-doped SrCuO2.

G Simutis1, S Gvasaliya, M Månsson

  • 1Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH Zürich, Zürich 8093, Switzerland.

Physical Review Letters
|August 27, 2013
PubMed
Summary
This summary is machine-generated.

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Dilute nickel impurities in strontium cuprate (SrCuO2) create a pseudogap in quantum spin chains. This defect-induced pseudogap is a universal feature, explained by a simple model and confirmed by neutron scattering experiments.

Area of Science:

  • Condensed matter physics
  • Quantum magnetism
  • Materials science

Background:

  • Strontium cuprate (SrCuO2) is a well-known S=1/2 quantum spin chain material.
  • Understanding the effects of impurities on magnetic properties is crucial for materials science.
  • Previous studies have not fully characterized the impact of non-magnetic impurities on SrCuO2's spin dynamics.

Purpose of the Study:

  • To investigate the influence of dilute S=1 Ni impurities on the magnetic excitations of SrCuO2.
  • To determine the origin and characteristics of the observed pseudogap.
  • To develop a model explaining the pseudogap phenomenon in doped quantum spin chains.

Main Methods:

  • Inelastic neutron scattering experiments were performed on SrCuO2 doped with 1% Ni impurities.

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  • Measurements were conducted across a wide temperature range (2-300 K).
  • A theoretical model was developed to interpret the experimental data.

    • Main Results:

    • A pseudogap feature (Δ≈8 meV) was observed in the inelastic neutron scattering spectrum at low temperatures.
    • This pseudogap was absent in the undoped parent compound and unrelated to structural changes.
    • The pseudogap was identified as a generic characteristic of quantum spin chains with dilute defects.
    • A simple model quantitatively reproduced the experimental data and revealed a universal scaling form for the dynamic structure factor.

    Conclusions:

    • Dilute magnetic impurities in quantum spin chains can induce a pseudogap.
    • The observed pseudogap in Ni-doped SrCuO2 is a universal feature of defected spin chains.
    • The developed model provides a robust explanation for the experimental findings across various temperatures.