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McGuire, J. J.; Rõõm, T.; Mason, T.E.; Timusk, T.; Dąbkowska, H. A.; Coad, S.; Paul, Daniel

doi:10.1103/physrevb.59.1157

Cited by 8 publications

(11 citation statements)

References 20 publications

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“…Infrared-studies on CuGeO 3 were reported by several groups 13,33,35,36,37,38,39 , whose results correspond well for modes polarized along b and c. The determination of the frequencies for modes polarized along a is hampered by the shape of the crystal and was attempted only by one group 13 . Table V compares the optical results with the neutron and model frequencies; there is only one discrepancy concerning an a-polarized mode.…”

Section: Discussion Of the Phonon Dispersion In Cugeo3mentioning

confidence: 99%

Lattice dynamics ofCuGeO3: Inelastic neutron scattering and model calculations

Braden

Reichardt²,

Hennion³

et al. 2002

Phys. Rev. B

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The lattice dynamics in CuGeO3 has been analyzed by the combination of inelastic neutron scattering studies and lattice dynamical model calculations. We report an almost complete set of dispersion curves along the three orthorhombic directions and along [101]. The dispersion of branches associated with the modes directly involved in the spin-Peierls transition allows to explain the particular propagation vector of the structural distortion in the dimerized phase.

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Section: Discussion Of the Phonon Dispersion In Cugeo3mentioning

confidence: 99%

Lattice dynamics ofCuGeO3: Inelastic neutron scattering and model calculations

Braden

Reichardt²,

Hennion³

et al. 2002

Phys. Rev. B

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“…A 20 T superconducting magnet was employed for the magnetic field work. 54 Using the applied field ͑and occasionally temperature͒ as adjustable tuning parameters, we were able to explore the previously determined phase diagrams of the various similarly doped samples, taking spectra in a new frequency region ͑complementary to that of McGuire et al 50 ͒ within several representative phases. A detailed description of the experimental setup at the National High Magnetic Field Laboratory is given elsewhere.…”

Section: Methodsmentioning

confidence: 99%

“…71 Such a feature has been identified in doped CuGeO 3 at 10 cm Ϫ1 . 50 That the 98 cm Ϫ1 mode grows with doping and seems to be associated with the spin Peierls distortion supports such an assignment, but the 98 cm Ϫ1 feature is observed in pristine CuGeO 3 , making this description less satisfying. The most promising explanation for the trend in Fig.…”

Section: B 98 CM à1 Modementioning

confidence: 99%

“…McGuire et al observe several very low-frequency absorption lines with progressive Zn doping ͑10 and 20 cm Ϫ1 ) as well as a broader temperature independent absorption. 50 The 10 cm Ϫ1 feature, assigned as a librational motion of the GeO 4 tetrahedra, is absent in Si-doped samples. The temperature dependence of the 20 cm Ϫ1 structure is consistent with a three-level model, in which the two excited states are slightly above the energy of the ground state.…”

Section: Introductionmentioning

confidence: 97%

“…Surprisingly, the spectra of Zn-doped CuGeO 3 revealed no field dependence for the 10 and 20 cm Ϫ1 features. 50 Considering the richness of the pristine material, extension of earlier experiments by McGuire et al to higher energy ͑above 30 cm Ϫ1 ) is important.…”

Section: Introductionmentioning

confidence: 99%

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Low-energy excitations in impurity substitutedCuGeO3

Jones

Sushkov²,

Musfeldt³

et al. 2001

Phys. Rev. B

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We report far-infrared reflectance measurements of Zn-and Si-doped CuGeO 3 single crystals as a function of applied magnetic field at low temperature. Overall, the low-energy far-infrared spectra are extraordinarily sensitive to the various phase boundaries in the H-T diagram, with the features being especially rich in the low-temperature dimerized state. Zn impurity substitution rapidly collapses the 44 cm Ϫ1 zone-boundary spin Peierls gap, although broadened magnetic excitations are observed at the lightest doping level ͑0.2%͒ and a remnant is still observable at 0.7% substitution. In a 0.7% Si-doped sample, there is no evidence of the spin gap. Impurity substitution effects on the intensity of the 98 cm Ϫ1 zone-folding mode are striking as well. The lightly doped Zn crystals display an enhanced response, and even at intermediate doping levels, the mode intensity is larger than that in the pristine material. The Si-doped sample also displays an increased intensity of the 98 cm Ϫ1 mode in the spin Peierls phase relative to the pure material. The observed trends are discussed in terms of the effect of disorder on the spin gap and 98 cm Ϫ1 mode, local oscillator strength sum rules, and broken selection rules.

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Spin‐Peierls Materials

Musfeldt

2003

Magnetism: Molecules to Materials

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Far-infrared vibrational mode inCu1−xMxGe1

Cited by 8 publications

References 20 publications

Lattice dynamics ofCuGeO3: Inelastic neutron scattering and model calculations

Lattice dynamics ofCuGeO3: Inelastic neutron scattering and model calculations

Low-energy excitations in impurity substitutedCuGeO3

Spin‐Peierls Materials

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