Raman spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">SrRuO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>near the paramagnetic-to-ferromagnetic phase transition

Iliev, M. N.; Litvinchuk, A. P.; Lee, H.-G.; Chen, C. L.; Dezaneti, M.; Chu, C. W.; Ivanov, V. G.; Abrashev, M. V.; Popov, V. N.

doi:10.1103/physrevb.59.364

Cited by 81 publications

(66 citation statements)

References 13 publications

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“…3͑a͒ and 3͑b͒ for SRO films on STO and LAO, respectively. The low-energy modes around 200-240 cm −1 have an intensity that is almost independent on ⍜; this is consistent with a A g symmetry of this mode as reported by Iliev et al 20 On the other hand, inspection of data in Fig. 3͑a͒ clearly reveals features in the spectra of SRO on STO, particularly noticeable in the region around 350-410 cm −1 , that largely evolves with ⍜.…”

Section: B Domain Structure Analysis: Scans Of Nondegenerated Peakssupporting

confidence: 90%

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Domain structure of epitaxialSrRuO3thin films

et al. 2005

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Growth of multidomains in epitaxial thin-film oxides is known to have a detrimental effect on some functional properties, and, thus, efforts are done to suppress them. It is commonly accepted that optimal properties of the metallic and ferromagnetic SrRuO 3 ͑SRO͒ epitaxies can only be obtained if vicinal SrTiO 3 ͑001͒ ͑STO͒ substrates are used. It is believed that this results from the suppression of multidomain structure in the SRO film. Here we revise this important issue. Nanometric films of SRO have been grown on STO͑001͒ vicinal substrates with miscut ͑ V ͒ angles in the ϳ0.04°-4°range. Extensive structural analysis by x-ray-reciprocal space maps and -Raman spectroscopy indicates that single-domain, orthorhombic, SRO films are already obtained on the almost singular ͑ V Ϸ 0.1°͒ substrate, and, thus, substrates with large miscut angles are not required to grow twin-free films. In spite of this, transport properties are found to be optimized for films grown on vicinal substrates ͑ V ജ 2°͒. We claim that this is the result of the change of the growth mode and the resulting film morphology rather than the change of the domain structure. These findings drive the attention to the relevance of the growth mechanism at the initial stages of film growth, and we discuss its implications in other areas of oxide epitaxies. Moreover, we show that in clamped epitaxies on cubic substrates, in spite of isotropic biaxial substrate-induced strains, films may have an in-plane orthorhombic symmetry which results from the internal degree of freedom defined by rotations of the oxygen octahedrons.

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Section: B Domain Structure Analysis: Scans Of Nondegenerated Peakssupporting

confidence: 90%

“…20 Notice that there is a shift to higher energies of up to 3 cm −1 in the position of the phonon modes when comparing both samples, indicating that the SRO film grown on STO is under in-plane compressive strain, in agreement with the x-ray analysis of the films performed in Sec. III A.…”

Section: B Domain Structure Analysis: Scans Of Nondegenerated Peakssupporting

confidence: 85%

Domain structure of epitaxialSrRuO3thin films

et al. 2005

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“…4, its frequency deviates from the dependence expected for the anharmonic decay and hardens by as much as 5 cm −1 between T N and 10 K. According to the lattice dynamics calculations (Table I) this phonon corresponds to the rotations of the MnO 5 structural units in the xyplane and effectively modulates Mn-O-Mn exchange interaction. Similar phonon frequency anomalies at the magnetic ordering temperature have been observed earlier in CuO [15], SrRuO 3 [16], and CrO 2 [17,18].…”

Section: Temperature-dependent Raman and Infrared Spectrasupporting

confidence: 85%

Raman and infrared-active phonons in hexagonal HoMnO₃single crystals: magnetic ordering effects

Litvinchuk¹,

Iliev²,

Popov³

et al. 2004

J. Phys.: Condens. Matter

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Polarized Raman scattering and infrared reflection spectra of hexagonal HoMnO3 single crystals in the temperature range 10-300 K are reported. Group-theoretical analysis is performed and scattering selection rules for the second order scattering processes are presented. Based on the results of lattice dynamics calculations, performed within the shell model, the observed lines in the spectra are assigned to definite lattice vibrations. The magnetic ordering of Mn ions, which occurs below TN =76 K, is shown to effect both Raman-and infrared-active phonons, which modulate Mn-O-Mn bonds and, consequently, Mn exchange interaction.

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“…The Raman spectra of the SRO films showed five bands: four strong lines at 212 (A g ), 240 (A g ), 375 (B 2g ), and 400 (B 2g ) cm -1 and a weak peak at 281 cm -1 (A g ). The positions of the SRO peaks agree with values reported by Iliev et al [4] for Raman measurements done at room temperature on oriented SRO thin films. Figure 7 shows a typical Raman spectrum from an SRO film deposited on a MgO (100) single-crystal substrate.…”

Section: Raman Analysis Of Sro Texturesupporting

confidence: 81%

Practical superconductor development for electrical power applications - quarterly report for the period ending Dec. 31, 2003.

Dorris¹

2004

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This is a multiyear experimental research program that focuses on improving relevant material properties of high-critical temperature (T c ) superconductors and developing fabrication methods that can be transferred to industry for production of commercial conductors. The development of teaming relationships through agreements with industrial partners is a key element of the Argonne National Laboratory (ANL) program. Technical HighlightsWe report significant improvement in the properties of YBa 2 Cu 3 O 7-x (YBCO) films deposited on SrRuO 3 (SRO)-buffered substrates with an MgO film applied by inclined substrate deposition (ISD). Transport critical current density (J c ) for these samples was increased to 6.2×10 5 A/cm 2 at 77 K, from the values of 0.03-0.10 ×10 5 A/cm 2 that were initially reported. Raman spectroscopy studies indicated that the YBCO films were incompletely oxygenated, and that Raman analysis might be useful in evaluating the texture of SRO films. A three-dimensional (3-D) finite element analysis (FEA) of residual stresses in a multilayered coated conductor indicated that the interactions between layers are not significant; therefore, Stoney's equation [1] should be applicable to the measurement of residual stresses in complex, multilayered coated conductors. YBCO Films on SrRuO 3 (SRO)-Buffered ISD-MgO SubstratesThe standard ISD architecture consists of YBCO/CeO 2 /YSZ/HE-MgO/ISDMgO/YSZ/HC, where ISD-MgO is the MgO layer made by ISD, HE-MgO is the homoepitaxial MgO layer that is subsequently deposited, YSZ is yttria-stabilized zirconia, and HC is the substrate, Hastelloy C-276. SRO, having a relatively small (≈6.5%) lattice mismatch with MgO and a lattice mismatch with YBCO that is between that of YSZ and CeO 2 , might be a suitable alternative for one or both of the YSZ and CeO 2 layers in this architecture. In addition, SRO has favorable thermal and electrical conductivity. For these reasons, we have been investigating SRO as a potential alternative buffer layer for coated conductors made by the ISD process.We showed previously that YBCO on SRO-buffered ISD-MgO substrates had sharper in-plane alignment than did YBCO on YSZ-and CeO 2 -buffered ISD-MgO

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Raman spectroscopy ofSrRuO3near the paramagnetic-to-ferromagnetic phase transition

Cited by 81 publications

References 13 publications

Domain structure of epitaxialSrRuO3thin films

Domain structure of epitaxialSrRuO3thin films

Raman and infrared-active phonons in hexagonal HoMnO₃single crystals: magnetic ordering effects

Practical superconductor development for electrical power applications - quarterly report for the period ending Dec. 31, 2003.

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Raman spectroscopy ofSrRuO3near the paramagnetic-to-ferromagnetic phase transition

Cited by 81 publications

References 13 publications

Domain structure of epitaxialSrRuO3thin films

Domain structure of epitaxialSrRuO3thin films

Raman and infrared-active phonons in hexagonal HoMnO3single crystals: magnetic ordering effects

Practical superconductor development for electrical power applications - quarterly report for the period ending Dec. 31, 2003.

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Raman and infrared-active phonons in hexagonal HoMnO₃single crystals: magnetic ordering effects