Anisotropy of the electron spin-resonance linewidth of

Pilawa, B.

doi:10.1088/0953-8984/9/18/016

Cited by 28 publications

(35 citation statements)

References 21 publications

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“…At higher resonance frequencies these contributing resonance absorptions will separate more strongly in terms of their respective resonance fields and thus alter the averaged fit parameters obtained by parameterizing the powder spectrum by a single Lorentzian line. The broader distribution of resonance fields also result in an additional broadening of the linewidth via the anisotropic Zeeman interaction 33 and, indeed, an increase of the linewidth of about 80 Oe in the Q-band data with respect of the X-band data is observed for temperatures below about 150 K. Above the linewidth values for both frequencies coincide within the experimental uncertainty. We used the value of 1.89 to fit the susceptibility (see Fig.…”

Section: Electron Spin Resonancementioning

confidence: 55%

Electron spin resonance and exchange paths in the orthorhombic dimer system Sr2VO4

et al. 2012

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We report on susceptibility and electron spin resonance (ESR) measurements at X-and Q-band frequencies of Sr 2 VO 4 with orthorhombic symmetry. In this dimer system, the V 4+ ions are in tetrahedral environment and are coupled by an antiferromagnetic intradimer exchange constant J /k B ≈ 100 K to form a singlet ground state without any phase transitions between room temperature and 2 K. Based on an extended Hückel tight-binding analysis, we identify the strongest exchange interaction to occur between two inequivalent vanadium sites via two intermediate oxygen ions. The ESR absorption spectra can be well fitted by a single Lorentzian line and the temperature dependence of the ESR intensity, and the dc susceptibility can be modeled by using the Bleaney-Bowers approach for independent dimers. The temperature dependence of the ESR linewidth at X-band frequency can be modeled by a superposition of a linear increase with temperature with a slope α = 1.35 Oe/K and a thermally activated behavior with an activation energy /k B = 1418 K, both of which point to spin-phonon coupling as the dominant relaxation mechanism in this compound.

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Section: Electron Spin Resonancementioning

confidence: 55%

Electron spin resonance and exchange paths in the orthorhombic dimer system Sr2VO4

et al. 2012

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“…Details are described by Pilawa for the case of CuGeO 3 , where a similar situation occurs due to two inequivalent Cu chains. 18 Assuming that the interdimer isotropic exchange interaction, which is responsible for the narrowing of the anisotropic Zeeman contribution, is much weaker than the intra-dimer isotropic exchange interaction, this contribution to the line broadening should be largest for an angle of 45 • in the a * -b plane, where the difference in g values of both sites is largest, but should vanish for 0 • and 90 • , where the g values are equal. Moreover, this contribution should gain importance with increasing frequency due to its quadratic field dependence.…”

Section: Resultsmentioning

confidence: 99%

Structural and magnetic dimers in the spin-gapped systemCuTe2O5

et al. 2006

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We investigated the magnetic properties of the system CuTe2O5 by susceptibility and electron spin resonance measurements. The anisotropy of the effective g-factors and the ESR linewidth indicates that the anticipated structural dimer does not correspond to the singlet-forming magnetic dimer. Moreover, the spin susceptibility of CuTe2O5 can only be described by taking into account interdimer interactions of the same order of magnitude than the intradimer coupling. Analyzing the exchange couplings in the system we identify the strongest magnetic coupling between two Cu ions to be mediated by super-super exchange interaction via a bridging Te ligand, while the superexchange coupling between the Cu ions of the structural dimer only results in the second strongest coupling.

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“…It has been shown 13,23 that in the high temperature limit that contribution is proportional to ( g) 2 . However, in SeCuO 3 the weakest coupling within the tetramer is J 12 ∼ 160 K and the high temperature limit refers to values much above our experimental window.…”

Section: Electron Spin Resonancementioning

confidence: 99%

Site-selective quantum correlations revealed by magnetic anisotropy in the tetramer system SeCuO3

Živković¹,

Djokić²,

Herak³

et al. 2012

Phys. Rev. B

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We present the investigation of a monoclinic compound SeCuO 3 using x-ray powder diffraction, magnetization, torque, and electron-spin-resonance. Structurally based analysis suggests that SeCuO 3 can be considered as a three-dimensional network of tetramers. The values of intratetramer exchange interactions are extracted from the temperature dependence of the susceptibility and amount to ∼ 200 K. The intertetramer coupling leads to the development of long-range antiferromagnetic order at T N = 8 K. An unusual temperature dependence of the effective g tensors is observed, accompanied with a rotation of macroscopic magnetic axes. We explain this unique observation as due to site-selective quantum correlations.

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Anisotropy of the electron spin-resonance linewidth of

Cited by 28 publications

References 21 publications

Electron spin resonance and exchange paths in the orthorhombic dimer system Sr2VO4

Electron spin resonance and exchange paths in the orthorhombic dimer system Sr2VO4

Structural and magnetic dimers in the spin-gapped systemCuTe2O5

Site-selective quantum correlations revealed by magnetic anisotropy in the tetramer system SeCuO3

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