Spin gaps and quantum fluctuations in a frustrated magnet

Harris, A. B.

doi:10.1016/s0304-8853(00)01327-5

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…Although we could not find a theory to explain the spin wave dispersion for ferrimagnets with the three magnetic sublattices, two spin waves with energy gaps are possible. 15,16 However, a more elaborate theory is necessary. The energy gap in the antiferromagnet is introduced by the interplay of anisotropy and exchange energy; it is given by E g = (2E A E E ) 1/2 , where E A and E E are the anisotropy and the exchange energies, respectively.…”

Section: Resultsmentioning

confidence: 99%

Spin state and orbital ordering in CuCr2O4investigated by NMR

Kang

Kim

et al. 2013

Phys. Rev. B

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63,65 Cu and 53 Cr nuclear magnetic resonance spectra for CuCr 2 O 4 were measured at various magnetic fields and temperatures. The microscopic evidence of orbital ordering in CuCr 2 O 4 was obtained from a dipolar hyperfine field, NQR, and magnetic anisotropy analysis of the linewidth broadening of the Cu and Cr NMR spectra measured in the external magnetic field. The energy gap in the dispersion relation of the spin wave excitation was measured from the temperature dependence of the resonance frequency of Cu and Cr ions in CuCr 2 O 4. The energy gap of the Cu ions is about 10 K (± 5 K), and that of the Cr ions is about 40 K (± 5 K). These values imply that the spin-orbit coupling of Cr ions is stronger than that of Cu ions related to the orbital ordering in CuCr 2 O 4. The magnetic field dependence of the Cr NMR frequency shows that the angle between the Cr 3+ magnetic moment and the Cu 2+ magnetic moment is about 98 • (± 2 •).

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Section: Resultsmentioning

confidence: 99%

Spin state and orbital ordering in CuCr2O4investigated by NMR

Kang

Kim

et al. 2013

Phys. Rev. B

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“…The range of systems studied by FMR has grown during recent decades, ranging from nanocrystalline alloys [3,4], thin films [5,6], nanoparticles [7,8], and more recently, spin frustrated systems [9,10]. Nevertheless, the number of FMR experiments on nanoparticles dispersions and assemblies is not consistent with the large development in synthesis, characterization, and applications of these systems in magnetism and related disciplines.…”

Section: Introductionmentioning

confidence: 99%

Thermal evolution of the ferromagnetic resonance in Fe2O3/SiO2 nanocomposites for magneto-optical sensors

Ortega

Garitaonandia

Barrera-Solano

et al. 2008

Sensors and Actuators A: Physical

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Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2

et al. 2017

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We report detailed neutron scattering studies on Ba2Cu3O4Cl2. The compound consists of two interpenetrating sublattices of Cu, labeled as CuA and CuB, each of which forms a square-lattice Heisenberg antiferromagnet. The two sublattices order at different temperatures and effective exchange couplings within the sublattices differ by an order of magnitude. This yields an inelastic neutron spectrum of the CuA sublattice extending up to 300 meV and a much weaker dispersion of CuB going up to around 20 meV. Using a single-band Hubbard model we derive an effective spin Hamiltonian. From this, we find that linear spin-wave theory gives a good description to the magnetic spectrum. In addition, a magnetic field of 10 T is found to produce effects on the CuB dispersion that cannot be explained by conventional spin-wave theory.

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Spin gaps and quantum fluctuations in a frustrated magnet

Cited by 3 publications

References 11 publications

Spin state and orbital ordering in CuCr2O4investigated by NMR

Spin state and orbital ordering in CuCr2O4investigated by NMR

Thermal evolution of the ferromagnetic resonance in Fe2O3/SiO2 nanocomposites for magneto-optical sensors

Magnetic excitations from the two-dimensional interpenetrating Cu framework in Ba2Cu3O4Cl2

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