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Hornung J, Gottschall T, Opherden L, Antlauf M, Schwarz M, Kroke E, Herrmannsdörfer T, Wosnitza J. Splitting of the magnetic monopole pair-creation energy in spin ice. J Phys Condens Matter 2020; 32:36LT01. [PMID: 32369787 DOI: 10.1088/1361-648x/ab9054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Accepted: 05/05/2020] [Indexed: 06/11/2023]
Abstract
The thermodynamics in spin-ice systems are governed by emergent magnetic monopole excitations and, until now, the creation of a pair of these topological defects was associated with one specific pair-creation energy. Here, we show that the electric dipole moments inherent to the magnetic monopoles lift the degeneracy of their creation process and lead to a splitting of the pair-creation energy. We consider this finding to extend the model of magnetic relaxation in spin-ice systems and show that an electric dipole interaction in the theoretically estimated order of magnitude leads to a splitting which can explain the controversially discussed discrepancies between the measured temperature dependence of the magnetic relaxation times and previous theory. By applying our extended model to experimental data of, various spin-ice systems, we show its universal applicability and determine a dependence of the electric dipole interaction on the system parameters, which is in accordance with the theoretical model of electric dipole formation.
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Affiliation(s)
- J Hornung
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany
| | - T Gottschall
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - L Opherden
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany
| | - M Antlauf
- Institut für Anorganische Chemie, TU Bergakademie Freiberg, 09596 Freiberg, Germany
| | - M Schwarz
- Institut für Anorganische Chemie, TU Bergakademie Freiberg, 09596 Freiberg, Germany
| | - E Kroke
- Institut für Anorganische Chemie, TU Bergakademie Freiberg, 09596 Freiberg, Germany
| | - T Herrmannsdörfer
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - J Wosnitza
- Dresden High Magnetic Field Laboratory (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany
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Rizzo F, Augieri A, Kursumovic A, Bianchetti M, Opherden L, Sieger M, Hühne R, Hänisch J, Meledin A, Van Tendeloo G, MacManus-Driscoll JL, Celentano G. Pushing the limits of applicability of REBCO coated conductor films through fine chemical tuning and nanoengineering of inclusions. Nanoscale 2018; 10:8187-8195. [PMID: 29676427 DOI: 10.1039/c7nr09428k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
An outstanding current carrying performance (namely critical current density, Jc) over a broad temperature range of 10-77 K for magnetic fields up to 12 T is reported for films of YBa2Cu3O7-x with Ba2Y(Nb,Ta)O6 inclusion pinning centres (YBCO-BYNTO) and thicknesses in the range of 220-500 nm. Jc values of 10 MA cm-2 were measured at 30 K - 5 T and 10 K - 9 T with a corresponding maximum of the pinning force density at 10 K close to 1 TN m-3. The system is very flexible regarding properties and microstructure tuning, and the growth window for achieving a particular microstructure is wide, which is very important for industrial processing. Hence, the dependence of Jc on the magnetic field angle was readily controlled by fine tuning the pinning microstructure. Transmission electron microscopy (TEM) analysis highlighted that higher growth rates induce more splayed and denser BYNTO nanocolumns with a matching field as high as 5.2 T. Correspondingly, a strong peak at the B||c-axis is noticed when the density of vortices is lower than the nanocolumn density. YBCO-BYNTO is a very robust and reproducible composite system for high-current coated conductors over an extended range of magnetic fields and temperatures.
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Affiliation(s)
- F Rizzo
- ENEA, Frascati Research Centre, Via E. Fermi, 45-00044 Frascati, Italy.
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Roslova M, Golub P, Opherden L, Ovchinnikov A, Uhlarz M, Baranov AI, Prots Y, Isaeva A, Coduri M, Herrmannsdörfer T, Wosnitza J, Doert T, Ruck M. Synthesis of a Cu-Filled Rh17S15 Framework: Microwave Polyol Process Versus High-Temperature Route. Inorg Chem 2017; 56:11513-11523. [DOI: 10.1021/acs.inorgchem.7b01102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Lars Opherden
- Dresden
High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | | | - Marc Uhlarz
- Dresden
High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | - Alexey I. Baranov
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Yurii Prots
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | | | - Mauro Coduri
- ESRF−The European Synchrotron, 38043 Grenoble, France
| | - Thomas Herrmannsdörfer
- Dresden
High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | - Joachim Wosnitza
- Dresden
High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
| | | | - Michael Ruck
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
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Roslova M, Opherden L, Veremchuk I, Spillecke L, Kirmse H, Herrmannsdörfer T, Wosnitza J, Doert T, Ruck M. Downscaling Effect on the Superconductivity of Pd3Bi2X2 (X = S or Se) Nanoparticles Prepared by Microwave-Assisted Polyol Synthesis. Inorg Chem 2016; 55:8808-15. [PMID: 27518909 DOI: 10.1021/acs.inorgchem.6b01326] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pd3Bi2S2 and Pd3Bi2Se2 have been successfully prepared in the form of nanoparticles with diameters of ∼50 nm by microwave-assisted modified polyol synthesis at low temperatures. The composition and morphology of the samples have been studied by means of powder X-ray diffraction as well as electron microscopy methods, including X-ray intensity mapping on the nanoscale. Superconducting properties of the as-prepared samples have been characterized by electrical resistivity measurements down to low temperatures (∼0.2 K). Deviations from the bulk metallic behavior originating from the submicrometer nature of the samples were registered for both phases. A significant critical-field enhancement up to 1.4 T, i.e., 4 times higher than the value of the bulk material, has been revealed for Pd3Bi2Se2. At the same time, the critical temperature is suppressed to 0.7 K from the bulk value of ∼1 K. A superconducting transition at 0.4 K has been observed in nanocrystalline Pd3Bi2S2. Here, a zero-temperature upper critical field of ∼0.5 T has been estimated. Further, spark plasma-sintered Pd3Bi2S2 and Pd3Bi2Se2 samples have been investigated. Their superconducting properties are found to lie between those of the bulk and nanosized samples.
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Affiliation(s)
- Maria Roslova
- Department of Chemistry and Food Chemistry, Technische Universität Dresden , 01062 Dresden, Germany
| | - Lars Opherden
- Institute for Solid State Physics, Technische Universität Dresden , 01062 Dresden, Germany.,Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz Center Dresden-Rossendorf , 01314 Dresden, Germany
| | - Igor Veremchuk
- Max Planck Institute for Chemical Physics of Solids , 01187 Dresden, Germany
| | - Lena Spillecke
- Institute for Solid State Physics, Technische Universität Dresden , 01062 Dresden, Germany.,Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz Center Dresden-Rossendorf , 01314 Dresden, Germany
| | - Holm Kirmse
- Institute of Physics, Humboldt University of Berlin , 12489 Berlin, Germany
| | - Thomas Herrmannsdörfer
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz Center Dresden-Rossendorf , 01314 Dresden, Germany
| | - Joachim Wosnitza
- Institute for Solid State Physics, Technische Universität Dresden , 01062 Dresden, Germany.,Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz Center Dresden-Rossendorf , 01314 Dresden, Germany
| | - Thomas Doert
- Department of Chemistry and Food Chemistry, Technische Universität Dresden , 01062 Dresden, Germany
| | - Michael Ruck
- Department of Chemistry and Food Chemistry, Technische Universität Dresden , 01062 Dresden, Germany.,Max Planck Institute for Chemical Physics of Solids , 01187 Dresden, Germany
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Abstract
The folding of DNA into arbitrary two- and three-dimensional shapes, called DNA origami, represents a powerful tool for the synthesis of functional nanostructures. Here, we present the first approach toward the paramagnetic functionalization of DNA origami nanostructures by utilizing postassembly coordination with Eu(3+) ions. In contrast to the usual formation of toroidal dsDNA condensates in the presence of trivalent cations, planar as well as rod-like DNA origami maintain their shape and monomeric state even under high loading with the trivalent lanthanide. Europium coordination was demonstrated by the change in Eu(3+) luminescence upon binding to the two DNA origami. Their natural circular dichroism in the Mg(2+)- and Eu(3+)-bound state was found to be very similar to that of genomic DNA, evidencing little influence of the DNA origami superstructure on the local chirality of the stacked base pairs. In contrast, the magnetic circular dichroism of the Mg(2+)-bound DNA origami deviates from that of genomic DNA. Furthermore, the lanthanide affects the magnetic properties of DNA in a superstructure-dependent fashion, indicative of the existence of superstructure-specific geometry of Eu(3+) binding sites in the DNA origami that are not formed in genomic DNA. This simple approach lays the foundation for the generation of magneto-responsive DNA origami nanostructures. Such systems do not require covalent modifications and can be used for the magnetic manipulation of DNA nanostructures or for the paramagnetic alignment of molecules in NMR spectroscopy.
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Affiliation(s)
- Lars Opherden
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf , P.O.B. 510119, 01314 Dresden, Germany
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