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Klaproth T, Aswartham S, Shemerliuk Y, Selter S, Janson O, van den Brink J, Büchner B, Knupfer M, Pazek S, Mikhailova D, Efimenko A, Hayn R, Savoyant A, Gubanov V, Koitzsch A. Origin of the Magnetic Exciton in the van der Waals Antiferromagnet NiPS_{3}. Phys Rev Lett 2023; 131:256504. [PMID: 38181357 DOI: 10.1103/physrevlett.131.256504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 09/29/2023] [Accepted: 10/03/2023] [Indexed: 01/07/2024]
Abstract
An ultrasharp photoluminescence line intimately related to antiferromagnetic order has been found in NiPS_{3}, a correlated van der Waals material, opening prospects for magneto-optical coupling schemes and spintronic applications. Here we unambiguously clarify the singlet origin of this excitation, confirming its roots in the spin structure. Based on a comprehensive investigation of the electronic structure using angle-resolved photoemission and q-dependent electron energy loss spectroscopy as experimental tools we develop, in a first step, an adequate theoretical understanding using density functional theory (DFT). In a second step the DFT is used as input for a dedicated multiplet theory by which we achieve excellent agreement with available multiplet spectroscopy. Our Letter connects the understanding of the electronic structure and of optical processes in NiPS_{3} and related materials as a prerequisite for further progress of the field.
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Affiliation(s)
- T Klaproth
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - S Aswartham
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - Y Shemerliuk
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - S Selter
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - O Janson
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - J van den Brink
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - B Büchner
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
- Institute of Solid State and Material Physics, Technische Universität Dresden, 01062 Dresden, Germany
| | - M Knupfer
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - S Pazek
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - D Mikhailova
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - A Efimenko
- Helmholtz-Zentrum Berlin für Materialien und Energie, Interface Design, Albert Einstein Str. 15, 12489 Berlin, Germany
- Helmholtz Zentrum Berlin für Materialien und Energie, Energy Materials In-situ Laboratory Berlin (EMIL), Albert Einstein Str. 15, 12489 Berlin, Germany
| | - R Hayn
- Aix-Marseille Université, Centre National de la Recherche Scientifique, IM2NP-UMR 7334, 13397 Marseille Cedex 20, France
| | - A Savoyant
- Aix-Marseille Université, Centre National de la Recherche Scientifique, IM2NP-UMR 7334, 13397 Marseille Cedex 20, France
| | - V Gubanov
- Aix-Marseille Université, Centre National de la Recherche Scientifique, IM2NP-UMR 7334, 13397 Marseille Cedex 20, France
| | - A Koitzsch
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstrasse 20, 01069 Dresden, Germany
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Janson O, Sörensen JH, Strømme M, Engqvist H, Procter P, Welch K. Evaluation of an alkali-treated and hydroxyapatite-coated orthopedic implant loaded with tobramycin. J Biomater Appl 2019; 34:699-720. [PMID: 31408413 DOI: 10.1177/0885328219867968] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Oscar Janson
- 1 Division of Materials Science, Department of Engineering Sciences, Uppsala University, Uppsala, Sweden
| | | | - Maria Strømme
- 3 Division of Nanotechnology and Functional Materials, Department of Engineering Sciences, Uppsala University, Uppsala, Sweden
| | - Håkan Engqvist
- 1 Division of Materials Science, Department of Engineering Sciences, Uppsala University, Uppsala, Sweden
| | - Philip Procter
- 1 Division of Materials Science, Department of Engineering Sciences, Uppsala University, Uppsala, Sweden
| | - Ken Welch
- 3 Division of Nanotechnology and Functional Materials, Department of Engineering Sciences, Uppsala University, Uppsala, Sweden
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Hulsart-Billström G, Janson O, Engqvist H, Welch K, Hong J. Thromboinflammation as bioactivity assessment of H 2O 2-alkali modified titanium surfaces. J Mater Sci Mater Med 2019; 30:66. [PMID: 31127371 PMCID: PMC6534515 DOI: 10.1007/s10856-019-6248-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 03/27/2019] [Indexed: 06/09/2023]
Abstract
The release of growth factors from platelets, mediated by the coagulation and the complement system, plays an important role in the bone formation around implants. This study aimed at exploring the thromboinflammatory response of H2O2-alkali soaked commercially pure titanium grade 2 discs exposed to whole human blood, as a way to assess the bioactivity of the discs. Commercially pure titanium grade 2 discs were modified by soaking in H2O2, NaOH and Ca(OH)2. The platelet aggregation, coagulation activation and complement activation was assessed by exposing the discs to fresh whole blood from human donors. The platelet aggregation was examined by a cell counter and the coagulation and complement activation were assessed by ELISA-measurements of the concentration of thrombin-antithrombin complex, C3a and terminal complement complex. The modified surface showed a statistically significant increased platelet aggregation, coagulation activation and complement activation compared to unexposed blood. The surface also showed a statistically significant increase of coagulation activation compared to PVC. The results of this study showed that the H2O2-alkali soaked surfaces induced a thromboinflammatory response that indicates that the surfaces are bioactive.
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Affiliation(s)
- Gry Hulsart-Billström
- Department of Engineering Sciences, Division of Applied Material Science, Uppsala University, 751 21, Uppsala, Sweden
| | - Oscar Janson
- Department of Engineering Sciences, Division of Applied Material Science, Uppsala University, 751 21, Uppsala, Sweden
| | - Håkan Engqvist
- Department of Engineering Sciences, Division of Applied Material Science, Uppsala University, 751 21, Uppsala, Sweden
| | - Ken Welch
- Department of Engineering Sciences, Division of Nanotechnology and Functional Materials, Uppsala University, 751 21, Uppsala, Sweden
| | - Jaan Hong
- Department of Immunology, Genetics and Pathology, Rudbeck Laboratory C5, Uppsala University, 75185, Uppsala, Sweden.
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Fowler L, Janson O, Engqvist H, Norgren S, Öhman-Mägi C. Antibacterial investigation of titanium-copper alloys using luminescent Staphylococcus epidermidis in a direct contact test. Materials Science and Engineering: C 2019; 97:707-714. [DOI: 10.1016/j.msec.2018.12.050] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 10/18/2018] [Accepted: 12/16/2018] [Indexed: 12/15/2022]
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Janson O, Furukawa S, Momoi T, Sindzingre P, Richter J, Held K. Magnetic Behavior of Volborthite Cu_{3}V_{2}O_{7}(OH)_{2}·2H_{2}O Determined by Coupled Trimers Rather than Frustrated Chains. Phys Rev Lett 2016; 117:037206. [PMID: 27472136 DOI: 10.1103/physrevlett.117.037206] [Citation(s) in RCA: 4] [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] [Received: 09/14/2015] [Indexed: 06/06/2023]
Abstract
Motivated by recent experiments on volborthite single crystals showing a wide 1/3-magnetization plateau, we perform microscopic modeling by means of density functional theory (DFT) with the single-crystal structural data as a starting point. Using DFT+U, we find four leading magnetic exchanges: antiferromagnetic J and J_{2}, as well as ferromagnetic J^{'} and J_{1}. Simulations of the derived spin Hamiltonian show good agreement with the experimental low-field magnetic susceptibility and high-field magnetization data. The 1/3-plateau phase pertains to polarized magnetic trimers formed by strong J bonds. An effective J→∞ model shows a tendency towards condensation of magnon bound states preceding the plateau phase.
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Affiliation(s)
- O Janson
- Institut für Festkörperphysik, TU Wien, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria
| | - S Furukawa
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - T Momoi
- Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - P Sindzingre
- Laboratoire de Physique Théorique de la Matière Condensée, Université P. & M. Curie, 75252 Paris, France
| | - J Richter
- Institut für Theoretische Physik, Universität Magdeburg, D-39016 Magdeburg, Germany
| | - K Held
- Institut für Festkörperphysik, TU Wien, Wiedner Hauptstraße 8-10, 1040 Vienna, Austria
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Gumeniuk R, Schöneich M, Kvashnina KO, Akselrud L, Tsirlin AA, Nicklas M, Schnelle W, Janson O, Zheng Q, Curfs C, Burkhardt U, Schwarz U, Leithe-Jasper A. Intermetallic germanides with non-centrosymmetric structures derived from the Yb3Rh4Sn13 type. Dalton Trans 2015; 44:5638-51. [PMID: 25705863 DOI: 10.1039/c4dt03155e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New germanides with composition RE3Pt4Ge13 (RE = Y, Pr, Sm, Gd, Tb, Tm) have been prepared by high-pressure, high-temperature synthesis. Their crystal structures have been refined, and the relationship of this new rhombohedral and monoclinic structure types with the primitive cubic Yb3Rh4Sn13 prototype is discussed. Band structure calculations within density functional theory confirm the distorted rhombohedral and monoclinic structural arrangements to be energetically more favorable than the simple cubic one. X-ray absorption spectroscopy and magnetic susceptibility measurements indicate that the RE-atoms are in the +3 oxidation state in all studied compounds.
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Affiliation(s)
- R Gumeniuk
- Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
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Tencé S, Janson O, Krellner C, Rosner H, Schwarz U, Grin Y, Steglich F. CoBi3--the first binary compound of cobalt with bismuth: high-pressure synthesis and superconductivity. J Phys Condens Matter 2014; 26:395701. [PMID: 25204566 DOI: 10.1088/0953-8984/26/39/395701] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The first compound in the cobalt bismuth system was synthesized by high-pressure high-temperature synthesis at 5 GPa and 450 °C. CoBi3 crystallizes in space group Pnma (no. 62) with lattice parameters of a = 8.8464(7) Å, b = 4.0697(4) Å and c = 11.5604(9) Å adopting a NiBi3-type crystal structure. CoBi3 undergoes a superconducting transition at Tc = 0.48(3) K as evidenced by electrical-resistivity and specific-heat measurements. Based on the anomaly of the specific heat at Tc and considering the estimated electron-phonon coupling, the new Bi-rich compound can be classified as a Bardeen-Cooper-Schrieffer-type superconductor with weak electron-phonon coupling. Density-functional theory calculations disclose a sizable influence of the spin-orbit coupling to the valence states and proximity to a magnetic instability, which accounts for a significantly enhanced Sommerfeld coefficient.
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Affiliation(s)
- S Tencé
- CNRS, ICMCB, UPR 9048, F-33600 Pessac, France. Univ. Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France
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Janson O, Richter J, Rosner H. Modified kagome physics in the natural spin-1/2 kagome lattice systems: kapellasite Cu3Zn(OH)6Cl2 and haydeeite Cu3Mg(OH)6Cl2. Phys Rev Lett 2008; 101:106403. [PMID: 18851233 DOI: 10.1103/physrevlett.101.106403] [Citation(s) in RCA: 8] [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] [Received: 05/26/2008] [Indexed: 05/26/2023]
Abstract
The recently discovered natural minerals Cu3Zn(OH)6Cl2 and Cu3Mg(OH)6Cl2 are spin 1/2 systems with an ideal kagome geometry. Based on electronic structure calculations, we develop a realistic model which includes couplings across the kagome hexagons beyond the original kagome model that are intrinsic in real kagome materials. Exact diagonalization studies for the derived model reveal a strong impact of these couplings on the magnetic ground state. Our predictions could be compared to and supplied with neutron scattering, thermodynamic data, and NMR data.
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Affiliation(s)
- O Janson
- Max-Planck-Institut für Chemische Physik fester Stoffe, D-01187 Dresden, Germany
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Nilsson L, Janson O, Hamberger L, Bergh C, Wikland M. [A debate on test-tube fertilization. Conclusions by the medical-ethical committee should not be surprising!]. Lakartidningen 1995; 92:3811-3. [PMID: 7564636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- L Nilsson
- kvinnokliniken, Sahlgrenska sjukhuset, Göteborg
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Janson O. [Gynecologic surgery is not only laparoscopic technique. Knowledge of routine gynecology is also needed]. Lakartidningen 1994; 91:219. [PMID: 8309325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- O Janson
- Institutionen för obstetrik och gynekologi, Sahlgrenska sjukhuset, Göteborg
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Zimmermann M, Janson O. [Iatrogenic nerve lesions as endodontic complications]. Quintessenz 1991; 42:735-41. [PMID: 1961894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- M Zimmermann
- Klinik und Poliklinik für Kieferchirurgie der Universität München
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Spitzer WJ, Janson O. [Occlusal function after surgical correction of a distal bite]. Dtsch Zahnarztl Z 1988; 43:S31-2. [PMID: 3251744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Janson O, Albrecht I, Ahrén K. Effects of prostaglandin f2a on ovarian blood flow and vascular resistance in the pseudopregnant rabbit. Acta Endocrinol (Copenh) 1975; 79:337-50. [PMID: 1173492 DOI: 10.1530/acta.0.0790337] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
In the search for data supporting the hypothesis that the luteolytic effect of prostaglandins (PG) is initiated by a vascular mechanism, some haemodynamic parameters including ovarian blood flow and vascular resistance were measured in pseudopregnant anaesthetized rabbits before and after exogenous administration of PGF2a. The measurements were performed on days 5-10 of pseudopregnancy induced by 500 IU HCG iv.
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