Optical properties of single-crystal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=

Zibold, A.; Liu, Hsiang Lin; Moore, S. W.; Graybeal, J. M.; Tanner, D. B.

doi:10.1103/physrevb.53.11734

Cited by 35 publications

(30 citation statements)

References 32 publications

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“…More specifically, in the frequency region where the crystal transmits along the a and b axes, the measured reflectance has an additional contribution from the back surface. Using the method employed by Zibold et al, 12 i.e., assuming that k is small in the region of interest, we are able to extract the single bounce reflectance of the sample. Since the c axis does not exhibit transmission, the measured reflectance was assumed to be single bounce reflectance along this direction.…”

Section: B Kramers-kronig and Oscillator-model Fitsmentioning

confidence: 99%

Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O
Miller
¹
,
Stephens
²
,
Martin
³

et al. 2012
Phys. Rev. B
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Infrared reflection and transmission as a function of temperature have been measured on single crystals of Cu3Bi(SeO3)2O2Cl. The complex dielectric function and optical properties along all three principal axes of the orthorhombic cell were obtained via Kramers-Kronig analysis and by fits to a Drude-Lorentz model. Below 115 K, 16 additional modes (8(E â)+6(E b )+2(E ĉ)) appear in the phonon spectra; however, powder x-ray diffraction measurements do not detect a new structure at 85 K. Potential explanations for the new phonon modes are discussed. Transmission in the far infrared as a function of temperature has revealed magnetic excitations originating below the magnetic ordering temperature (Tc ∼24 K). The origin of the excitations in the magnetically ordered state will be discussed in terms of their response to different polarizations of incident light, behavior in externally-applied magnetic fields, and the anisotropic magnetic properties of Cu3Bi(SeO3)2O2Cl as determined by d.c. susceptibility measurements.2

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Section: B Kramers-kronig and Oscillator-model Fitsmentioning

confidence: 99%

Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O
Miller
¹
,
Stephens
²
,
Martin
³

et al. 2012
Phys. Rev. B
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“…The salient spectral features are three peaks: the same feature we saw in LCO (appearing here at about 5 eV), a feature at 2 eV which appears to shift and lose definition with q, and a peak at 10.5 eV which is absent at low-q but which gains intensity as q is increased. The 2 eV feature strongly resembles dipole-active charge transfer gap seen with optical reflectivity [19].…”

mentioning

confidence: 99%

Resonant Inelastic X-Ray Scattering from Valence Excitations in Insulating Copper Oxides

Abbamonte

Burns

Isaacs³

et al. 1999

Phys. Rev. Lett.

126

141

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We report resonant inelastic x-ray measurements of insulating La2CuO4 and Sr2CuO2Cl2 taken with the incident energy tuned near the Cu K absorption edge. We show that the spectra are well described in a shakeup picture in 3rd order perturbation theory which exhibits both incoming and outgoing resonances, and demonstrate how to extract a spectral function from the raw data. We conclude by showing q-dependent measurements of the charge transfer gap.PACS numbers: 78.70. Ck, 74.25.Jb Inelastic x-ray scattering (IXS) has shown promise as a practical probe of electronic excitations in condensed matter because of its broad kinematic range and direct coupling to the electron charge. However, since x-rays are strongly absorbed in high density materials, successful applications of the technique have been limited to low-Z systems [1,2,3,4,5].Several recent studies [6,7,8,9], have shown that by that by tuning the incident energy near an x-ray absorption edge a Raman effect could be measured, despite the high absorption, because of the resonant enhancement. These studies have emphasized the role of coulomb interactions in the scattering process. Since it involves coupling between highly excited virtual states and strongly correlated valence states, it is important to characterize the resonance process well for the technique to be useful.With emphasis on systematics, we have measured resonant inelastic x-ray scattering at moderate resolution (∆E=0.9 eV) near the CuK absorption edge in the high-T c parent insulator La 2 CuO 4 (LCO) as a function of incident photon energy. Based on the changes of inelastic intensity and peak position with incident energy we show that the scattering is well described in a "shakeup" picture in 3rd order perturbation threoy [10]. We also present higher resolution measurements (∆E=0.45 eV) on another insulator, Sr 2 CuO 2 Cl 2 (SCOC), as a function of momentum transfer, q, which show some new features, such as the 2 eV optical charge transfer gap.Experiments were carried out at the X21 wiggler line at the National Synchrotron Light Source and the 3ID (SRI-CAT) undulator line at the Advanced Photon Source. At X21 the energy resolution was 0.45 eV and typical count rates were 0.4 Hz. At 3ID with 0.9 eV resolution 9 Hz was typical. The scattered light was collected with a spherical, diced, Ge(733) analyzer and imaged onto a detector. Energy analysis was done by rotating the analyzer and translating the detector in coincidence. The momentum transfer was varied by rotating the entire apparatus around the scattering center (exact experimental geometries are indicated in the figure captions). −1 parallel toĉ. The upper frame shows the raw spectra plotted against transferred energy (curves are offset for clarity). In the lower frame the open and filled circles are the inelastic peak height and position, respectively, plotted against incident energy. The black line is the fluorescence yield which peaks at the Cu1s → 4p energy.The LCO and SCOC crystals were grown by techniques described previously [11,12]....

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“…This is specially useful for compounds like Sr 2 CuO 2 Cl 2 for which experimental phonon frequencies are limited to four infrared (IR)-active phonon modes at the center of the Brillouin zone (BZ) 41,42 , and no neutron scattering data for phonons are available. However, experimental and theoretical studies of bulk lattice dynamics of the isostructural La 2 CuO 4 are extensive and contain detailed information about relevant model potentials 4,5,8,11,12,43 .…”

Section: Lattice Dynamical Analysis a Static Equilibrium And Bulmentioning

confidence: 99%

Structure and lattice dynamics ofSr2CuO2Cl2(001)studied by helium-a

et al. 2005

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Structure and lattice dynamics of the (001) surface of Sr2CuO2Cl2 have been studied by helium atom scattering (HAS). Analysis of diffraction patterns obtained by elastic HAS revealed a surface periodicity consistent with bulk termination, and confirms that the surface is non-polar and stable which favors a SrCl surface termination. Bulk and surface lattice dynamical calculations based on the shell-model were carried out to characterize the experimental phonon dispersions obtained by inelastic HAS. No experimental surface mode was observed above 200 cm −1 . Comparison between the experimental data and theoretical results for two different slabs with SrCl and CuO2 terminations showed that the experimental data conforms exclusively with the SrCl surface modes.

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Optical properties of single-crystalSr2CuO2

Cited by 35 publications

References 32 publications

Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O
Miller
¹
,
Stephens
²
,
Martin
³

et al. 2012
Phys. Rev. B
Self Cite

Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O
Miller
¹
,
Stephens
²
,
Martin
³

et al. 2012
Phys. Rev. B
Self Cite

Resonant Inelastic X-Ray Scattering from Valence Excitations in Insulating Copper Oxides

Structure and lattice dynamics ofSr2CuO2Cl2(001)studied by helium-a

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Optical properties of single-crystalSr2CuO2

Cited by 35 publications

References 32 publications

Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2OMiller1, Stephens2, Martin3 et al. 2012Phys. Rev. BSelf Cite

Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2OMiller1, Stephens2, Martin3 et al. 2012Phys. Rev. BSelf Cite

Resonant Inelastic X-Ray Scattering from Valence Excitations in Insulating Copper Oxides

Structure and lattice dynamics ofSr2CuO2Cl2(001)studied by helium-a

Contact Info

Product

Resources

About

Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O
Miller
¹
,
Stephens
²
,
Martin
³

et al. 2012
Phys. Rev. B
Self Cite

Infrared phonon anomaly and magnetic excitations in single-crystal Cu3Bi(SeO3)2O
Miller
¹
,
Stephens
²
,
Martin
³

et al. 2012
Phys. Rev. B
Self Cite