Field-induced structural evolution in the spin-Peierls compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuGeO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml:math>High-field ESR study

Zvyagin, S. A.; Krzystek, J.; Loosdrecht, P.H.M. van; Dhalenne, G.; Revcolevschi, A.

doi:10.1103/physrevb.67.212403

Cited by 12 publications

(6 citation statements)

References 21 publications

(25 reference statements)

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“…The frequency of the third zero-field transition could not be established. We thus took advantage of our recently introduced method of gathering tunable-frequency HFEPR data using BWO sources . Figure depicts spectra recorded at several frequencies in the vicinity of 600 GHz.…”

Section: Resultsmentioning

confidence: 99%

Pseudooctahedral Complexes of Vanadium(III): Electronic Structure Investigation by Magnetic and Electronic Spectroscopy

et al. 2004

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A variety of physical methods has been used to probe the non-Kramers, S = 1, V(III) ion in two types of pseudooctahedral complexes: V(acac)(3), where acac = anion of 2,4-pentanedione, and VX(3)(thf)(3), where thf = tetrahydrofuran and X = Cl and Br. These methods include tunable frequency and high-field electron paramagnetic resonance (HFEPR) spectroscopy (using frequencies of approximately 95-700 GHz and fields up to 25 T) in conjunction with electronic absorption, magnetic circular dichroism (MCD), and variable-temperature variable-field MCD (VTVH-MCD) spectroscopies. Variable-temperature magnetic susceptibility and field-dependent magnetization measurements were also performed. All measurements were conducted on complexes in the solid state (powder or mull samples). The field versus sub-THz wave quantum energy dependence of observed HFEPR resonances yielded the following spin Hamiltonian parameters for V(acac)(3): D = +7.470(1) cm(-1); E = +1.916(1) cm(-1); g(x) = 1.833(4); g(y) = 1.72(2); g(z) = 2.03(2). For VCl(3)(thf)(3), HFEPR detected a single zero-field transition at 15.8 cm(-1) (474 GHz), which was insufficient to determine the complete set of spin Hamiltonian parameters. For VBr(3)(thf)(3), however, a particularly rich data set was obtained using tunable-frequency HFEPR, and analysis of this data set gave the folowing: D = -16.162(6) cm(-1); E = -3.694(4) cm(-1); g(x) = 1.86(1); g(y) = 1.90(1); g(z) = 1.710(4). Analysis of the VTVH-MCD data gave spin Hamiltonian parameters in good agreement with those determined by HFEPR for both V(acac)(3) and VBr(3)(thf)(3) and in rough agreement with the estimate for VCl(3)(thf)(3) (D approximately 10 cm(-1), |E/D| approximately 0.18), together with the finding that the value of D is negative for both thf complexes. The electronic structures of these V(III) complexes are discussed in terms of their molecular structures and the electronic transitions observed by electronic absorption and MCD spectroscopies.

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Section: Resultsmentioning

confidence: 99%

Pseudooctahedral Complexes of Vanadium(III): Electronic Structure Investigation by Magnetic and Electronic Spectroscopy

et al. 2004

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“…HFEPR Instrumentation. HFEPR measurements were made using the new sub-THz spectroscopy facility at NHMFL . The tunable frequencies in the 150−700 GHz range (∼5−23 cm -1 energy) were provided by a set of four backward wave oscillators (Institute of General Physics, Moscow, Russian Federation).…”

Section: Methodsmentioning

confidence: 99%

Definitive Spectroscopic Determination of Zero-Field Splitting in High-Spin Cobalt(II)

et al. 2004

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A high-spin Co(II) complex (3d(7), S = 3/2), Co(PPh(3))(2)Cl(2) (Ph = phenyl), has been investigated in the solid state by both high-frequency and -field electron paramagnetic resonance (HFEPR) and by variable-temperature, variable-field magnetic circular dichroism (VTVH-MCD). In HFEPR spectroscopy, the combination of variable sub-THz frequencies generated by backward wave oscillators (150-700 GHz, corresponding to energy 5-23 cm(-1)) and high magnetic fields (0-25 T) constitutes a novel experimental technique allowing accurate determination of a complete set of spin Hamiltonian parameters for this complex: D = -14.76(2) cm(-1), E = 1.141(8) cm(-1), g(x) = 2.166(4), g(y) = 2.170(4), g(z) = 2.240(5). Independent VTVH-MCD studies on multiple absorption bands of the complex yield D = -14(3) cm(-1), E = 0.96(20) cm(-1) (absolute value of E/D = 0.08(2)), g(x) = 2.15(5), g(y) = 2.16(4), and g(z) = 2.17(3). This very good agreement between HFEPR and MCD indicates that there is no inherent discrepancy between these two quite different experimental techniques. Thus, depending on the nature of the sample, either can be reliably used to determine zero-field splitting parameters in high-spin Co(II), with the HFEPR being more accurate but VTVH-MCD being more sensitive.

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“…Previously, an induced phase transition and the appearance of a linear magnetoelectric effect have been reported by polarization measurements under a pulse magnetic field of 20 T. [20][21][22] Electron spin resonance ͑ESR͒ has been shown to be a very powerful tool for the study of magnetic excitation and phase transitions in solids. 39,40 The main purpose of this investigation was to study the magnetic excitation spectrum of BiFeO 3 crystals over a broad frequency range under steady magnetic fields up to 25 T. It was anticipated that this investigation would provide a more thorough and reliable understanding of magnetic-field-induced phase transitions and magnetoelectric coupling at high magnetic fields in BiFeO 3 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic-field-induced phase transition inBiFeO3observed by high-field electron spin resonance: Cycloidal to homogeneous spin order

Ruette

Zvyagin

Pyatakov³

et al. 2004

Phys. Rev. B

397

195

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Bismuth ferrite is a magnetoelectric material, which simultaneously has polarization and spin orders. We have used electron spin resonance ͑ESR͒ as a local probe of the magnetic order in the magnetic-field range of 0-25 T, in the frequency domain of 115-360 GHz, and at a temperature of 4.2 K. The data reveal significant changes in the ESR spectra with increasing field, which have been analyzed by taking into account the magnetic anisotropy of the crystal and a magnetoelectric Dzyaloshinsky-Moria-like interaction. The results demonstrate an induced phase transition from an incommensurately cycloidal modulated state to one with homogeneous spin order.

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Field-induced structural evolution in the spin-Peierls compoundCuGeO3:High-field ESR study

Cited by 12 publications

References 21 publications

Pseudooctahedral Complexes of Vanadium(III): Electronic Structure Investigation by Magnetic and Electronic Spectroscopy

Pseudooctahedral Complexes of Vanadium(III): Electronic Structure Investigation by Magnetic and Electronic Spectroscopy

Definitive Spectroscopic Determination of Zero-Field Splitting in High-Spin Cobalt(II)

Magnetic-field-induced phase transition inBiFeO3observed by high-field electron spin resonance: Cycloidal to homogeneous spin order

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