ESR of the quasi-two-dimensional antiferromagnet CuCrO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>with a triangular lattice

Vasiliev, A. M.; Prozorova, L. A.; Svistov, L. E.; Tsurkan, V.; Dziom, V.; Shuvaev, A.; Pimenov, A.

doi:10.1103/physrevb.88.144403

Cited by 10 publications

(24 citation statements)

References 23 publications

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“…The propagation vector of each domain can be directed along one side of the triangle and can be pos itive or negative. As reported in [14,18], the distribu tion of the domains is strongly affected by the cooling history of the sample.…”

Section: Crystal and Magnetic Structurementioning

confidence: 68%

“…9). We chose these two temperature sets, because the domain walls in CuCrO 2 are mobile at high temperatures, whereas at low tem peratures the walls are pinned [18].…”

Section: Resultsmentioning

confidence: 99%

“…The spin plane orientation of such a structure is defined by weak rel ativistic interactions with the external field and crys tal environment. Following [18], the anisotropic figure; A, B, and C correspond to three possible alignments of the propagation vector of the magnetic structure (q ic is collinear to the triangle side marked thick); η A , η B , η C are the relative weights of the NMR signals from A, B, C domains, which were used for the best coin cidence with experiment. part of the magnetic energy of CuCrO 2 can be writ ten as (2) where A > B > 0.…”

Section: Discussionmentioning

confidence: 99%

“…The anisotropy along the c direction dominates, with the anisotropy constant approximately hundred times larger than that within the ab plane resulting from distortions of the triangle structure. A magnetic phase transition was observed for the field applied perpendicular to one side of the tently described [9,14,18] by the reorientation of the spin plane from (110) (n ⊥ H) to ( ) (n || H). This spin reorientation occurs due to weak susceptibility anisotropy of the spin structure χ || ≈ 1.05χ ⊥ .…”

Section: Crystal and Magnetic Structurementioning

confidence: 99%

“…Results of the magnetization, ESR, and electric polarization experiments [9,18] have been discussed in the framework of the planar spiral spin structure at fields studied experimentally: μ 0 H < 14 T Ӷ μ 0 H sat (μ 0 H sat ≈ 280 T). The orientation of the spin plane is defined by the biaxial crystal anisotropy.…”

Section: Crystal and Magnetic Structurementioning

confidence: 99%

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Magnetic structure and domain conversion of the quasi-2D frustrated antiferromagnet CuCrO2 probed by NMR

Sakhratov

Svistov²,

Kuhns

et al. 2014

J. Exp. Theor. Phys.

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We have carried out 63,65 Cu NMR spectra measurements in a magnetic field up to about 15.5 T on a single crystal of the multiferroic triangular lattice antiferromagnet CuCrO 2 . The measure ments were performed for perpendicular and parallel orientations of the magnetic field with respect to the c axis of the crystal, and the detailed angle dependence of the spectra on the magnetic field direction in the ab plane was studied. The shape of the spectra can be well described in the model of spiral spin structure proposed by recent neutron diffraction experiments. When the field is rotated perpendicular to the crystal c axis, we observed, directly for the first time, a remarkable reorientation of the spin plane simultaneous with rotation of the incommensurate wavevector, by quantitatively deducing the conver sion of the energetically less favorable domain to a more favorable one. At high enough fields parallel to the c axis, the data are consistent with either a field induced commensurate spiral magnetic structure or an incommensurate spiral magnetic structure with a disorder in the c direction, suggesting that high fields may have influence on interplanar ordering.

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Section: Crystal and Magnetic Structurementioning

confidence: 68%

“…9). We chose these two temperature sets, because the domain walls in CuCrO 2 are mobile at high temperatures, whereas at low tem peratures the walls are pinned [18].…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Crystal and Magnetic Structurementioning

confidence: 99%

Section: Crystal and Magnetic Structurementioning

confidence: 99%

See 3 more Smart Citations

Magnetic structure and domain conversion of the quasi-2D frustrated antiferromagnet CuCrO2 probed by NMR

Sakhratov

Svistov²,

Kuhns

et al. 2014

J. Exp. Theor. Phys.

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Electrical conductivity, thermoelectrical properties, and EPR spectroscopy of copper chromite ceramic samples doped with magnesium

Kulbachinskii

Кытин

Kondratieva

et al. 2019

Low Temperature Physics

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The results of a study of copper chromite ceramic samples doped with magnesium are presented. The samples were synthesized according to the solid-phase method using a special procedure for preparing the initial mixture, which ensures a uniform distribution of magnesium with its content from 0.2 to 6%. The substitution of chromium for magnesium in the crystal lattice is confirmed by Raman scattering of light and EPR spectra. As the magnesium content increases from 0 to 6 at.%, the resistivity of the synthesized samples decreases by more than 3 orders of magnitude at room temperature. High thermopower values were obtained, and it was shown that the main charge carriers are holes, and the predominant mechanism of hole transport in doped samples is hopping transfer over localized states, whose density decreases with an increase in energy near the Fermi energy. It is shown that the localization radius increases with an increase in magnesium content.

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Magnetic-field-induced phases in anisotropic triangular antiferromagnets: Application to CuCrO2

et al. 2014

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We introduce a minimal spin model for describing the magnetic properties of CuCrO 2 . Our Monte Carlo simulations of this model reveal a rich magnetic field induced phase diagram, which explains the measured field dependence of the electric polarization. The sequence of phase transitions between different mutiferroic states arises from a subtle interplay between spatial and spin anisotropy, magnetic frustration and thermal fluctuations. Our calculations are compared to new measurements up to 92 T. PACS numbers: 75.85.+t, 75.30.Kz, 75.50.Ee Triangular lattice antiferromagnets (TLA) are widely studied in the field of frustrated magnetism. Complex orderings and rich phase diagrams arise because three antiferromagnetic interactions within a triangle cannot be simultaneously satisfied. Delafossite CuCrO 2 is a particularly clean example of a TLA where quasi-classical Cr 3+ S = 3/2 spins form a triangular lattice in the ab plane. [1, 2] The spins have outof-plane anisotropy and weak interlayer coupling that is one to two orders of magnitude smaller than the in-plane interactions. [3][4][5] The three spins of each triangle form a nearly 120• structure and all three sublattices form proper-screw spirals that propagate along the same [110] axis with propagation vector q = 0.329 (the spins rotate in and out of the ab plane). [1,6,7] The spiral can propagate along any of six directions (three choices for the [110] axis and two choices for the helicity) leading to six possible domains.The proper-screw spiral induces an electric polarization P along the spiral propagation vector. [3,[6][7][8][9][10][11][12] This allows us to probe phase transitions between spiral states at high applied magnetic fields H a , while the magnetization is largely insensitive to these transitions. The non-zero P is consistent with Arima's mechanism for multiferroic behavior, [13] where the spiral magnetic structure slightly influences the hybridization between the Cr d-orbitals and the O p-orbitals via spin-orbit coupling, creating a net P q. Thus, a pattern of electromagnetic domains forms below the magnetic ordering temperature that can be influenced by small electric and magnetic fields relative to the dominant exchange interactions. [6,10] The triangular layers of CuCrO 2 stack along the c-axis such that a Cr 3+ ion from one layer lies at the center of a triangle of Cr 3+ ions in the next layer. [1, 2, 9] The triangular lattice distorts by about 0.01% as a result of the spiral magnetic ordering, leading to two different exchange interactions, J and J , along different bonds of the triangle [3,10,11,14,15] (Fig. 1). Thermodynamic measurements show two close-lying phase transitions. Elastic neutron diffraction measurements suggest that below T N = 24.2 K, the triangular plane develops collinear spin correlations. A spiral long-range order appears below T MF = 23.6 K and also induces net P, possibly via a first-order transition. [8,15,16] The H a dependence of this spiral ordering is only partially explored in experiments and theory. [8,9,17,1...

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ESR of the quasi-two-dimensional antiferromagnet CuCrO2with a triangular lattice

Cited by 10 publications

References 23 publications

Magnetic structure and domain conversion of the quasi-2D frustrated antiferromagnet CuCrO2 probed by NMR

Magnetic structure and domain conversion of the quasi-2D frustrated antiferromagnet CuCrO2 probed by NMR

Electrical conductivity, thermoelectrical properties, and EPR spectroscopy of copper chromite ceramic samples doped with magnesium

Magnetic-field-induced phases in anisotropic triangular antiferromagnets: Application to CuCrO2

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