Evaluation of LaSrGaO4 as a substrate for YBa2Cu3O7−δ

McConnell, A. W.; Hughes, Robert A.; Dąbkowski, A.; Dąbkowska, H. A.; Preston, J. S.; Greedan, J. E.; Timusk, T.

doi:10.1016/0921-4534(94)90318-2

Cited by 22 publications

(4 citation statements)

References 9 publications

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“…SrLaΑlO4 and SrLaGaO4 are currently considered [2][3][4][5][6] as some of the best substrate materials for the epitaxy of high-Τc superconductors. Taking into account the small mismatch between the substrate and HTSC layers, the application areas include: -(001) oriented SrLaGaO4 for the deposition of YBaCuO [2,3], and 1212 and 1223 phases of Hg based superconductors [4] with c-axis perpendicular to the substrate surface, -(100) oriented SrLaGaO 4 for the deposition of YBaCuO [5], and 1212 mercury films with c-axis parallel to the substrate surface, -(001) oriented SrLaΑlO4 [6] for the deposition of La2-x Srx CuO4.…”

Section: Introductionmentioning

confidence: 99%

High Quality (100) and (001) Oriented Substrates Prepared from Czochralski Grown SrLaGaO₄and SrLaAlO₄Single Crystals

et al. 1997

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The growth of SrLaGaO 4 and SrLaAlO4 crystals on (100) and (001) oriented seeds was investigated. Various defects, which appeared in crystals grown on these two orientations, were observed in polarized light and by X-ray diffraction topography. It was found that to obtain a substrate of the best quality, the crystal should be cut along the growth directions. Therefore, crystals pulled along (100) direction are utilized for preparation of (001) substrates, whereas (100) substrates are better to cut from crystals grown on (001) seed. The quality of the prepared substrates was determined by high resolution X-ray diffraction study in terms of rocking curve and mean mosaic angle.

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Section: Introductionmentioning

confidence: 99%

High Quality (100) and (001) Oriented Substrates Prepared from Czochralski Grown SrLaGaO₄and SrLaAlO₄Single Crystals

et al. 1997

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“…Our thin films are grown in-house using the pulsed laser deposition technique. 6,7 The films typically have areas in excess of the 50 mm 2 needed to accommodate the long THz wavelengths. Figure 6 shows the resistivity curves for two of the films under investigation; a near optimally doped superconductor with a T c of 90 K and an underdoped sample with a T c of 62K.…”

Section: Superconducting Ybcomentioning

confidence: 99%

Terahertz pump-probe spectroscopy in YBCO thin films

et al. 2004

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Terahertz (THz) radiation is ideal for probing many different materials and processes. Photons in the THz regime have energies on the order of an meV, which is an important energy scale for many electronic processes. In this paper we will describe the use of optical rectification of 50 fs IR pulses to generate THz pulses. Using this method, spectrally broad THz pulses with durations on the order of ps can be produced. This feature allows us to obtain time and frequency resolved information about the transmission of THz radiation during transient processes. A 50 fs IR pulse is used to optically excite a material and the relaxation as a function of time can be observed with the THz probe.We are developing a transient THz spectroscopy to study non-equilibrium processes in thin film superconducting YBa 2 Cu 3 O 7-δ (YBCO). We use ultrafast optical pulses to excite the sample, breaking a fraction of the Cooper pairs responsible for the film's superconductivity. This process produces highly energetic quasiparticles which thermalize and recombine on a picosecond timescale as the superconducting state recovers. Transient THz spectroscopy allows us to follow the evolution of this process with the required resolution, while simultaneously providing valuable spectroscopic information.

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“…The films used in these experiments were deposited on (0 0 1) (LSGO) or (1 1 0) (NGO) substrates using the pulsed laser deposition technique [6]. Both substrates present a close lattice match to YBCO.…”

Section: Sample Preparationmentioning

confidence: 99%

Laser Scanning Microscopy Studies on Detwinned<tex>$rm YBa_2rm Cu_3rm O_7-delta$</tex>Thin Films

Nam

Hughes

Dąbkowski

et al. 2005

IEEE Trans. Appl. Supercond.

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YBa 2 Cu 3 O 7 thin films are heavily microtwinned due to the crystal's orthorhombic unit cell and the confining effects of underlying substrate. Single crystal YBCO can be detwinned by thermally annealing the sample while applying uniaxial pressure. A similar technique has been devised to detwin a portion of a YBCO thin film. Through the use of photolithographic techniques, a suspended YBCO microbridge structure is fabricated, but with both ends of the bridge anchored to the substrate. During a subsequent anneal, the ends of the bridge induce a uniaxial stress along its length that arises from the lattice misfit and the thermal expansion coefficient mismatch between YBCO and the underlying materials. Without the confining effects of the substrate the suspended material can either detwin or twin on a macro length scale; the extent of which is largely determined by the substrate material. The ability to produce superconducting YBCO bridges that range from heavily microtwinned, to macrotwinned, to nearly detwinned provides an ideal experimental system. To study these phenomena, an optical and laser scanning microscopy set-up was employed. The images obtained provide insight into the role that twins play in determining the transport properties of superconducting YBCO thin films.

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Evaluation of LaSrGaO4 as a substrate for YBa2Cu3O7−δ

Cited by 22 publications

References 9 publications

High Quality (100) and (001) Oriented Substrates Prepared from Czochralski Grown SrLaGaO₄and SrLaAlO₄Single Crystals

High Quality (100) and (001) Oriented Substrates Prepared from Czochralski Grown SrLaGaO₄and SrLaAlO₄Single Crystals

Terahertz pump-probe spectroscopy in YBCO thin films

Laser Scanning Microscopy Studies on Detwinned<tex>$rm YBa_2rm Cu_3rm O_7-delta$</tex>Thin Films

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Evaluation of LaSrGaO4 as a substrate for YBa2Cu3O7−δ

Cited by 22 publications

References 9 publications

High Quality (100) and (001) Oriented Substrates Prepared from Czochralski Grown SrLaGaO4and SrLaAlO4Single Crystals

High Quality (100) and (001) Oriented Substrates Prepared from Czochralski Grown SrLaGaO4and SrLaAlO4Single Crystals

Terahertz pump-probe spectroscopy in YBCO thin films

Laser Scanning Microscopy Studies on Detwinned&lt;tex&gt;$rm YBa_2rm Cu_3rm O_7-delta$&lt;/tex&gt;Thin Films

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High Quality (100) and (001) Oriented Substrates Prepared from Czochralski Grown SrLaGaO₄and SrLaAlO₄Single Crystals

High Quality (100) and (001) Oriented Substrates Prepared from Czochralski Grown SrLaGaO₄and SrLaAlO₄Single Crystals

Laser Scanning Microscopy Studies on Detwinned<tex>$rm YBa_2rm Cu_3rm O_7-delta$</tex>Thin Films