Research Data Repository of Saxon Universities

OPARA is the Open Access Repository and Archive for Research Data of Saxon Universities.


Researchers of Saxon Universities can either publish their research data on OPARA, or archive it here to comply with requirements of funding acencies and good scientic practice, without public access.

You can find the documentation of this service at the ZIH Data Compendium websites. If you need suppourt using OPARA please contact the Servicedesk of TU Dresden.

Please note: The OPARA service was recently upgraded to a new technical platform (this site). Previously stored data will not be available here immediately. It can be found at the still active old version of OPARA. These stock data will be migrated in near future and then the old version of OPARA will finally be shut down. Existing DOIs for data publications remain valid.

Artwork based on 1, 2, 3, 4  @pixabay
 

Recent Submissions

Item
Open Access
Dataset Supporting the Characterization of Slag from SOEL Interconnect Remelting
(Technische Universität Bergakademie Freiberg, 2025-08-13) Mongoljiibuu, Shine-Od
This dataset supports the manuscript titled “Chromium in Slag from SOEL Interconnects Remelting: Characterization and Recycling Potential”. The study focuses on characterizing the bulk composition, mineralogy, its distribution, and elemental distributions in slag generated during the remelting of Solid Oxide Electrolyzer (SOEL) interconnects. The data include X-ray Fluoroscence (XRF) data, X-ray Diffraction (XRD) pattern data, X-ray Computed Tomography (XCT) dataset, and Scanning Electron Microscopy (SEM)-based Mineral Liberation Analysis dataset.
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Open Access
Multiple superconducting transitions in Yb$_{3+x}$Co$_4$Sn$_{13-x}$
(Technische Universität Bergakademie Freiberg, 2025-07-31) Meret, Orlob; Levytskyi, Volodymyr; Tsirlin, Alexander; Kundys, Bohdan; Sturm, Elena; Leithe-Jasper, Andreas; Gumeniuk, Roman
Abstract of the accompanying article: In the Yb-Co-Sn system a Remeika phase Yb$_{3+x}$Co$_{4}$Sn$_{13-x}$ is found with solid solution extending within $0\le\,x\,\le0.5$. All these compounds crystallize with primitive cubic [space group $Pm\bar{3}n$, $a\approx9.54$ \AA] strongly disordered Sc$_{3}$Ir$_4$Si$_{13+x}$ type. Stoichiometric Yb$_3$Co$_4$Sn$_{13}$ is a superconductor with critical temperature $T_c\,=\,3.1(2)$\,K, lower- [$B_\mathrm{c1}=1.90(2)$\,mT] and upper [$B_\mathrm{c2}=2.16(5)$\,T] critical fields. The specific heat jump $\Delta c_p/\gamma T_c\,=\,1.72(9)$ together with the fact that $B_\mathrm{c2}(T_c)$ dependence is described by the Werthamer-Helfand-Hohenberg (WHH) model hint towards a conventional mechanism with a weak electron-phonon coupling. Although a more precise analysis is hampered by the presence of multiple superconducting transitions observed in the specific heat of this Remeika phase, the non-stoichiometric Yb$_{3.2}$Co$_4$Sn$_{12.8}$ reveals $T_c\,=\,2.4(2)$\,K and $B_\mathrm{c2}=4.79(9)$\,T exceeding the classical Pauli limit. Strong electron-phonon coupling in this superconductor is confirmed by the high value of the $\lambda_\mathrm{AD}=0.92(2)$ parameter determined from the Allen-Dynes formula. However, the electronic specific heat of Yb$_{3.2}$Co$_4$Sn$_{12.8}$ follows the exponential law [$c_\mathrm{el}(T)\propto e^{-\Delta(0)/k_\mathrm{B}T}$] and can be described by the $\alpha$-model [$\alpha\equiv\Delta(0)/k_\mathrm{B}T_c=2$] indicating this stannide to be a conventional BCS-superconductor. Both Yb$_{3+x}$Co$_{4}$Sn$_{13-x}$ ($x=0, 0.2$) compounds reveal complex phonon spectra with possible `rattling' behavior. They are also found to be metallic systems, some aspects of which can be described by a free electron gas model.
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Open Access
Photogrammetric data of spherical target test fields
(Technische Universität Dresden, 2025-07-22) Liebold, Frank
This data publication contains photogrammetric data of test fields of spheres. Please download the zip files and extract them. There are three experiments: 1) Experiment 1 (in "experiment1.zip"): A test field with 5 x 5 white spheres on a black background. The spheres have diameters of 38 mm and 40 mm. The grid size is approximately 6 cm, see "sphere_ids_exp1.png". A bundle of nine images (see "image_orientations.png" in "test_images_and_camera_information_experiment1.zip") was recorded. - "image_bundle_tif_experiment1.zip" contains the images with tif format. The images are also available in jpg format ("image_bundle_jpg99_experiment1.zip"). - "image_ellipse_measurement_LoG7_starOperator_exp1.txt" contains the image measurements with the ellipse operator (star operator): id_image, id_sphere, ellipse center, semimajor and semiminor axes, inclination and error measures - "image_ellipse_contourpoints_LoG7_starOperator_exp1.txt" contains the image measurements with the ellipse operator (star operator) with all ellipse contour points (id_image, id_sphere, x, y) - The folder "3D_structured_light_scan" contains the results of a structured light scan using GOM ATOS scanner ( "sphere_measurement_GOM_ATOS_exp1.ply" with mesh, "spheres_3D_structured_light_scanner_cloudcompare_tab_exp1.txt" with extracted sphere center coordinates and radii as well as RMS of the residuals of the fit). 2) Experiment 2 (in "experiment2.zip"): See decription of experiment 1. In this case, there are 16 further spheres of 4 mm diameter on the test field, see "sphere_ids_exp2.png". 3) Experiment 3 (in "experiment3.zip"): Compared to experiment 1, there two scale bars are part of the measurements, see "image_orientations_exp3.png". There is also an image bundle ("image_bundle_tif_experiment3.zip" or "image_bundle_jpg99_experiment3.zip" and the image ellipse measurements ("image_ellipse_measurement_LoG7_starOperator_exp3.txt" and "image_ellipse_contourpoints_LoG7_starOperator_exp3.txt"). The 3D structured light scans are only done for the scale bars to measure radii and distances.
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Open Access
Data for "Ferrimagnetism from quantum fluctuations in Kitaev materials"
(Technische Universität Dresden, 2025-07-16) Francini, Niccolò; Cônsoli, Pedro M.; Janssen, Lukas
The archive contains the data used to construct Fig. 4, Fig. 5, Fig. 6, and Fig. 8 of the paper "Ferrimagnetism from quantum fluctuations in Kitaev materials" by N. Francini, Pedro M. Cônsoli, and L. Janssen [arXiv:2507.*****]. The work uses symmetry arguments and linear spin-wave theory to study the ferrimagnetic response of extended Kitaev-Heisenberg-Gamma models.
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Open Access
Original research data of “Systematic variation of the acceptor electrophilicity in donor-acceptor-donor emitters exhibiting efficient room temperature phosphorescence suited for digital luminescence"
(Technische Universität Dresden, 2025-07-16) Tsiko, Uliana; Fidelius, Jannis; Kaiser, Sebastian; Thomas, Heidi; Bui Thi, Yana; Weigand, Jan J.; Grazulevicius, Juozas V.; Schellhammer, Karl Sebastian; Reineke, Sebastian
Original research data to the following paper: Purely organic materials showing efficient and persistent emission via room temperature phosphorescence (RTP) allow the design of minimalistic yet powerful technological solutions for sensing, bioimaging, information storage, and safety applications using the photonic design principle of digital luminescence. Although several promising materials exist, a deep understanding of the underlying structure-property relationship and, thus, development of rational design strategies are widely missing. Some of the best purely organic emitters follow the donor-acceptor-donor design motif. In this study, the influence of the acceptor unit on the photophysical properties is systematically analyzed by synthesizing and characterizing variations of the RTP emitter 4,4′-dithianthrene-1-yl-benzophenone (BP-2TA). The most promising candidates are also tested in programmable luminescent tags as a potential application field for information storage. While no significant influence by the electrophilicity index of the acceptor moiety on the RTP emission is observed, the results support the design of molecules with pronounced hybridization as obtained for the newly synthesized emitter demonstrating superior RTP efficiency combined with improved stability.