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Helm T, Kimata M, Sudo K, Miyata A, Stirnat J, Förster T, Hornung J, König M, Sheikin I, Pourret A, Lapertot G, Aoki D, Knebel G, Wosnitza J, Brison JP. Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe 2. Nat Commun 2024; 15:37. [PMID: 38167667 PMCID: PMC10761692 DOI: 10.1038/s41467-023-44183-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 12/04/2023] [Indexed: 01/05/2024] Open
Abstract
The potential spin-triplet heavy-fermion superconductor UTe2 exhibits signatures of multiple distinct superconducting phases. For field aligned along the b axis, a metamagnetic transition occurs at μ0Hm ≈ 35 T. It is associated with magnetic fluctuations that may be beneficial for the field-reinforced superconductivity surviving up to Hm. Once the field is tilted away from the b towards the c axis, a reentrant superconducting phase emerges just above Hm. In order to better understand this remarkably field-resistant superconducting phase, we conducted magnetic-torque and magnetotransport measurements in pulsed magnetic fields. We determine the record-breaking upper critical field of μ0Hc2 ≈ 73 T and its evolution with angle. Furthermore, the normal-state Hall effect experiences a drastic suppression indicative of a reduced band polarization above Hm in the angular range around 30° caused by a partial compensation between the applied field and an exchange field. This promotes the Jaccarino-Peter effect as a likely mechanism for the reentrant superconductivity above Hm.
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Affiliation(s)
- Toni Helm
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany.
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany.
| | - Motoi Kimata
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Kenta Sudo
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Atsuhiko Miyata
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Julia Stirnat
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - Tobias Förster
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Jacob Hornung
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - Markus König
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Ilya Sheikin
- Laboratoire National des Champs Magnétiques Intenses (LNCMI-EMFL), CNRS, UGA, 38042, Grenoble, France
| | - Alexandre Pourret
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Gerard Lapertot
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Dai Aoki
- Institute for Materials Research, Tohoku University, Oarai, Ibaraki, 311-1313, Japan
| | - Georg Knebel
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
| | - Joachim Wosnitza
- Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany
| | - Jean-Pascal Brison
- Univ. Grenoble Alpes, CEA, Grenoble-INP, IRIG, PHELIQS, 38000, Grenoble, France
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Zhang F, Zhang Z, Zhao Y, Du C, Li Y, Gao J, Ren X, Ma T, Li B, Bu Y. Redox-Regulated Magnetic Conversions between Ferro- and Antiferromagnetism in Organic Nitroxide Diradicals. Molecules 2023; 28:6232. [PMID: 37687060 PMCID: PMC10488413 DOI: 10.3390/molecules28176232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 08/07/2023] [Accepted: 08/21/2023] [Indexed: 09/10/2023] Open
Abstract
Redox-induced magnetic transformation in organic diradicals is an appealing phenomenon. In this study, we theoretically designed twelve couples of diradicals in which two nitroxide (NO) radical groups are connected to the redox-active couplers including p-benzoquinonyl, 1,4-naphthoquinyl, 9,10-anthraquinonyl, naphthacene-5,12-dione, pentacene-6,13-dione, hexacene-6,15-dione, pyrazinyl, quinoxalinyl, phenazinyl, 5,12-diazanaphthacene, 6,13-diazapentacene, and 6,15-diazahexacene. As evidenced at both the B3LYP and M06-2X levels of theory, the calculations reveal that the magnetic reversal can take place from ferromagnetism to antiferromagnetism, or vice versa, by means of redox method in these designed organic magnetic molecules. It was observed that p-benzoquinonyl, 1,4-naphthoquinyl, 9,10-anthraquinonyl, naphthacene-5,12-dione, pentacene-6,13-dione, and hexacene-6,15-dione-bridged NO diradicals produce antiferromagnetism while their dihydrogenated counterparts exhibit ferromagnetism. Similarly, pyrazinyl, quinoxalinyl, phenazinyl, 5,12-diazanaphthacene, 6,13-diazapentacene, and 6,15-diazahexacene-bridged NO diradicals present ferromagnetism while their dihydrogenated counterparts show antiferromagnetism. The differences in the magnetic behaviors and magnetic magnitudes of each of the twelve couples of diradicals could be attributed to their distinctly different spin-interacting pathways. It was found that the nature of the coupler and the length of the coupling path are important factors in controlling the magnitude of the magnetic exchange coupling constant J. Specifically, smaller HOMO-LUMO (HOMO: highest occupied molecular orbital, LUMO: lowest unoccupied molecular orbital) gaps of the couplers and shorter coupler lengths, as well as shorter linking bond lengths, can attain stronger magnetic interactions. In addition, a diradical with an extensively π-conjugated structure is beneficial to spin transport and can effectively promote magnetic coupling, yielding a large |J| accordingly. That is, a larger spin polarization can give rise to a stronger magnetic interaction. The sign of J for these studied diradicals can be predicted from the spin alternation rule, the shape of the singly occupied molecular orbitals (SOMOs), and the SOMO-SOMO energy gaps of the triplet state. This study paves the way for the rational design of magnetic molecular switches.
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Affiliation(s)
- Fengying Zhang
- Department of Materials Science and Engineering, Jinzhong University, Jinzhong 030619, China; (C.D.); (Y.L.); (J.G.); (X.R.); (T.M.); (B.L.)
- Shanxi Province Collaborative Innovation Center for Light Materials Modification and Application, Jinzhong 030619, China
| | - Zijun Zhang
- Department of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, China;
| | - Yali Zhao
- Department of Materials Science and Engineering, Jinzhong University, Jinzhong 030619, China; (C.D.); (Y.L.); (J.G.); (X.R.); (T.M.); (B.L.)
- Shanxi Province Collaborative Innovation Center for Light Materials Modification and Application, Jinzhong 030619, China
| | - Chao Du
- Department of Materials Science and Engineering, Jinzhong University, Jinzhong 030619, China; (C.D.); (Y.L.); (J.G.); (X.R.); (T.M.); (B.L.)
- Shanxi Province Collaborative Innovation Center for Light Materials Modification and Application, Jinzhong 030619, China
| | - Yong Li
- Department of Materials Science and Engineering, Jinzhong University, Jinzhong 030619, China; (C.D.); (Y.L.); (J.G.); (X.R.); (T.M.); (B.L.)
- Shanxi Province Collaborative Innovation Center for Light Materials Modification and Application, Jinzhong 030619, China
| | - Jiaqi Gao
- Department of Materials Science and Engineering, Jinzhong University, Jinzhong 030619, China; (C.D.); (Y.L.); (J.G.); (X.R.); (T.M.); (B.L.)
- Shanxi Province Collaborative Innovation Center for Light Materials Modification and Application, Jinzhong 030619, China
| | - Xiaobo Ren
- Department of Materials Science and Engineering, Jinzhong University, Jinzhong 030619, China; (C.D.); (Y.L.); (J.G.); (X.R.); (T.M.); (B.L.)
- Shanxi Province Collaborative Innovation Center for Light Materials Modification and Application, Jinzhong 030619, China
| | - Teng Ma
- Department of Materials Science and Engineering, Jinzhong University, Jinzhong 030619, China; (C.D.); (Y.L.); (J.G.); (X.R.); (T.M.); (B.L.)
- Shanxi Province Collaborative Innovation Center for Light Materials Modification and Application, Jinzhong 030619, China
| | - Boqiong Li
- Department of Materials Science and Engineering, Jinzhong University, Jinzhong 030619, China; (C.D.); (Y.L.); (J.G.); (X.R.); (T.M.); (B.L.)
- Shanxi Province Collaborative Innovation Center for Light Materials Modification and Application, Jinzhong 030619, China
| | - Yuxiang Bu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;
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Morimachi Y, Urai M, Nakajima R, Kamebuchi H, Miyagawa K, Kanoda K, Zhou B. An organic superconductor, (TEA)(HEDO-TTF-dc) 2·2(H 2C 2O 4), coupled with strong hydrogen-bonding interactions. Chem Commun (Camb) 2023; 59:4162-4165. [PMID: 36853596 DOI: 10.1039/d3cc00080j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
A new organic superconductor (TEA)(HEDO-TTF-dc)2·2(H2C2O4) (H2EDO-TTF-dc = ethylenedioxy-tetrathiafulvalene dicarboxylic acids) with an onset TC of 4.0 K, was successfully obtained using oxalic acid and HEDO-TTF-dc anion donor. The crystal structure analysis indicated that strong π-π overlaps and very strong intra- and inter-molecular hydrogen-bonding interactions exist between the HEDO-TTF-dc anion donors and oxalic acid molecules.
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Affiliation(s)
- Yuto Morimachi
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40 Setagaya-Ku, Tokyo 156-8550, Japan.
| | - Mizuki Urai
- Department of Applied Physics, The University of Tokyo, Hongo 7-3-1 Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Ryota Nakajima
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40 Setagaya-Ku, Tokyo 156-8550, Japan. .,Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
| | - Hajime Kamebuchi
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40 Setagaya-Ku, Tokyo 156-8550, Japan.
| | - Kazuya Miyagawa
- Department of Applied Physics, The University of Tokyo, Hongo 7-3-1 Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Kazushi Kanoda
- Department of Applied Physics, The University of Tokyo, Hongo 7-3-1 Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Biao Zhou
- Department of Chemistry, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40 Setagaya-Ku, Tokyo 156-8550, Japan.
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4
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Fukuoka S, Kawamoto A. Antiferromagnetic Ground State of Molecular π-d System λ-(BEDT-STF)2FeCl4 Studied by Site-Selective Magnetization and Thermodynamic Measurements. CHEM LETT 2022. [DOI: 10.1246/cl.210767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shuhei Fukuoka
- Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Atsushi Kawamoto
- Department of Condensed Matter Physics, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
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Karchev N. Sequence of superconducting states in field cooled FeCr 2S 4. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:495604. [PMID: 34668485 DOI: 10.1088/1361-648x/ac276a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
In the present article we discuss theoretically the emergence of superconductivity in field cooled FeCr2S4. The chromium electrons form a triplett2gstates and due to antiferromagnetic exchange with the iron spins have Zeeman splitting. Applied, during preparation, magnetic field along the moment of iron ions, successively compensates the Zeeman splittings. The chromium electrons with zero Zeeman energy form Cooper pairs induced by iron magnons. In that way, we predict theoretically the existence of sequence of superconducting states in field cooled FeCr2S4. Actually there are three different superconductors prepared applying, during preparation, different magnetic fields. In these compounds superconductivity coexist with the saturated magnetism of iron ions.
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Affiliation(s)
- Naoum Karchev
- Department of Physics, University of Sofia, 1164 Sofia, Bulgaria
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Cao Y, Park JM, Watanabe K, Taniguchi T, Jarillo-Herrero P. Pauli-limit violation and re-entrant superconductivity in moiré graphene. Nature 2021; 595:526-531. [PMID: 34290431 DOI: 10.1038/s41586-021-03685-y] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 05/28/2021] [Indexed: 11/09/2022]
Abstract
Moiré quantum matter has emerged as a materials platform in which correlated and topological phases can be explored with unprecedented control. Among them, magic-angle systems constructed from two or three layers of graphene have shown robust superconducting phases with unconventional characteristics1-5. However, direct evidence of unconventional pairing remains to be experimentally demonstrated. Here we show that magic-angle twisted trilayer graphene exhibits superconductivity up to in-plane magnetic fields in excess of 10 T, which represents a large (2-3 times) violation of the Pauli limit for conventional spin-singlet superconductors6,7. This is an unexpected observation for a system that is not predicted to have strong spin-orbit coupling. The Pauli-limit violation is observed over the entire superconducting phase, which indicates that it is not related to a possible pseudogap phase with large superconducting amplitude pairing. Notably, we observe re-entrant superconductivity at large magnetic fields, which is present over a narrower range of carrier densities and displacement fields. These findings suggest that the superconductivity in magic-angle twisted trilayer graphene is likely to be driven by a mechanism that results in non-spin-singlet Cooper pairs, and that the external magnetic field can cause transitions between phases with potentially different order parameters. Our results demonstrate the richness of moiré superconductivity and could lead to the design of next-generation exotic quantum matter.
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Affiliation(s)
- Yuan Cao
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Jeong Min Park
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Kenji Watanabe
- Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
| | - Takashi Taniguchi
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
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Abstract
This short review article provides the reader with a summary of the history of organic conductors. To retain a neutral and objective point of view regarding the history, background, novelty, and details of each research subject within this field, a thousand references have been cited with full titles and arranged in chronological order. Among the research conducted over ~70 years, topics from the last two decades are discussed in more detail than the rest. Unlike other papers in this issue, this review will help readers to understand the origin of each topic within the field of organic conductors and how they have evolved. Due to the advancements achieved over these 70 years, the field is nearing new horizons. As history is often a reflection of the future, this review is expected to show the future directions of this research field.
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Cadmium-Inspired Self-Polymerization of {Ln IIICd 2} Units: Structure, Magnetic and Photoluminescent Properties of Novel Trimethylacetate 1D-Polymers (Ln = Sm, Eu, Tb, Dy, Ho, Er, Yb). Molecules 2021; 26:molecules26144296. [PMID: 34299571 PMCID: PMC8307922 DOI: 10.3390/molecules26144296] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 06/25/2021] [Accepted: 06/28/2021] [Indexed: 11/17/2022] Open
Abstract
A series of heterometallic carboxylate 1D polymers of the general formula [LnIIICd2(piv)7(H2O)2]n·nMeCN (LnIII = Sm (1), Eu (2), Tb (3), Dy (4), Ho (5), Er (6), Yb (7); piv = anion of trimethylacetic acid) was synthesized and structurally characterized. The use of CdII instead of ZnII under similar synthetic conditions resulted in the formation of 1D polymers, in contrast to molecular trinuclear complexes with LnIIIZn2 cores. All complexes 1–7 are isostructural. The luminescent emission and excitation spectra for 2–4 have been studied, the luminescence decay kinetics for 2 and 3 was measured. Magnetic properties of the complexes 3–5 and 7 have been studied; 4 and 7 exhibited the properties of field-induced single-molecule magnets in an applied external magnetic field. Magnetic properties of 4 and 7 were modelled using results of SA-CASSCF/SO-RASSI calculations and SINGLE_ANISO procedure. Based on the analysis of the magnetization relaxation and the results of ab initio calculations, it was found that relaxation in 4 predominantly occurred by the sum of the Raman and QTM mechanisms, and by the sum of the direct and Raman mechanisms in the case of 7.
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Abstract
Here, we review the different series of (super)conducting and magnetic radical salts prepared with organic donors of the tetrathiafulvalene (TTF) family and oxalato-based metal complexes (ox = oxalate = C2O42−). Although most of these radical salts have been prepared with the donor bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF = ET), we also include all the salts prepared with other TTF-type donors such as tetrathiafulvalene (TTF), tetramethyl-tetrathiafulvalene (TM-TTF), bis(ethylenediseleno)tetrathiafulvalene (BEST), bis(ethylenedithio)tetraselenafulvalene (BETS) and 4,5-bis((2S)-2-hydroxypropylthio)-4′,5′-(ethylenedithio)tetrathiafulvalene (DMPET). Most of the oxalate-based complexes are monomers of the type [MIII(C2O4)3]3−, [Ge(C2O4)3]2− or [Cu(C2O4)2]2−, but we also include the reported salts with [Fe2(C2O4)5]4− dimers, [MII(H2O)2[MIII(C2O4)3]2]4− trimers and homo- or heterometallic extended 2D layers such as [MIIMIII(C2O4)3]− and [MII2(C2O4)3]2−. We will present the different structural families and their magnetic properties (such as diamagnetism, paramagnetism, antiferromagnetism, ferromagnetism and even long-range magnetic ordering) that coexist with interesting electrical properties (such as semiconductivity, metallic conductivity and even superconductivity). We will focus on the electrical and magnetic properties of the so-called Day series formulated as β″-(BEDT-TTF)4[A+MIII(C2O4)3]·G, which represents the largest family of paramagnetic metals and superconductors reported to date, with more than fifty reported examples.
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Shen Y, Cosquer G, Zhang H, Breedlove BK, Cui M, Yamashita M. 4f-π Molecular Hybrid Exhibiting Rich Conductive Phases and Slow Relaxation of Magnetization. J Am Chem Soc 2021; 143:9543-9550. [PMID: 34156240 DOI: 10.1021/jacs.1c03748] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Cooperation between single-molecule magnets and electrical conductivity holds promise for preparing high-density magnetic devices; however, there are only a few reports so far. Here we report a 4f-π-based molecular hybrid, k-(ET)5Dy(NCS)7(KCl)0.5 (1) (ET = bis(ethylenedithio)tetrathiafulvalene, NCS- = thiocyanate), which undergoes slow relaxation of the magnetization and electrical conductivity. Unlike common ET-based conductive salts, K+ ions were intercalated into ET layers and coordinated with ET radicals. We found that the ET charges were sensitive to temperature, resulting in rich conductive phases at 75-300 K. In particular, the upturn in conductivity with a clear hysteresis loop was explained by the formation of partially oxidized states with charges close to 0.5+, which accounts for a metallic state. From the results of electronic structure calculations, the hole concentration increased to 125 K, which is consistent with a partially oxidized state upon cooling. The weak antiferromagnetic interactions accompanied by a dual magnetic relaxation process below 4 K are closely associated with the weak 4f-π interactions.
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Affiliation(s)
- Yongbing Shen
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Goulven Cosquer
- Research Group of Solid Material Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashihiroshima, Hiroshima 739-8526, Japan
| | - Haitao Zhang
- Institute of Inorganic and Applied Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Brian K Breedlove
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Mengxing Cui
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan.,School of Materials Science and Engineering, Nankai University, Tianjin 300350, China
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Chiral Radical Cation Salts of Me-EDT-TTF and DM-EDT-TTF with Octahedral, Linear and Tetrahedral Monoanions. MAGNETOCHEMISTRY 2021. [DOI: 10.3390/magnetochemistry7060087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Methyl-ethylenedithio-tetrathiafulvalene (Me-EDT-TTF (1) and dimethyl-ethylenedithio-tetrathiafulvalene (DM-EDT-TTF (2) are valuable precursors for chiral molecular conductors, which are generally obtained by electrocrystallization in the presence of various counter-ions. The number of the stereogenic centers, their relative location on the molecule, the nature of the counter-ion and the electrocrystallization conditions play a paramount role in the crystal structures and conducting properties of the resulting materials. Here, we report the preparation and detailed structural characterization of the following series of radical cation salts: (i) mixed valence (1)2AsF6 as racemic, and (S) and (R) enantiomers; (ii) [(S)-1]AsF6·C4H8O and [(R)-1]AsF6·C4H8O where a strong dimerization of the donors is observed; (iii) (1)I3 and (2)I3 as racemic and enantiopure forms and (iv) [(meso)-2]PF6 and [(meso)-2]XO4 (X = Cl, Re), based on the new donor (meso)-2. In the latter, the two methyl substituents necessarily adopt axial and equatorial conformations, thus leading to a completely different packing of the donors when compared to the chiral form (S,S)/(R,R) of 2 in its radical cation salts. Single crystal resistivity measurements, complemented by thermoelectric power measurements in the case of (1)2AsF6, suggest quasi-metallic conductivity for the latter in the high temperature regime, with σRT ≈ 1–10 S cm–1, while semiconducting behavior is observed for the (meso)-2 based salts.
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Yamaguchi M, Iwamura S, Mine K, Murakawa H, Hanasaki N, Matsuda M. An electrically conducting molecular crystal composed of a magnetic iron(iii) complex (S = 1/2) with a large aromatic ligand, 1,2-naphthlalocyanine (C 4h isomer): towards the development of molecular spintronics. Dalton Trans 2021; 50:5789-5794. [PMID: 33876804 DOI: 10.1039/d1dt00588j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The field of molecular spintronics has gained significant attention for the development of second-generation spintronic devices. Therefore, an electrically conducting molecular crystal, Ph4P[FeIII(1,2-Nc)(CN)2]2 (Ph4P = tetraphenylphosphonium and 1,2-Nc = C4h isomer of 1,2-naphthalocyanine), was fabricated as a new coordination compound with a strong π-d interaction. Furthermore, it is a mixed-valence compound with a local spin of S = 1/2 at the center of the conduction path. Crystal structure analysis revealed that Ph4P[FeIII(1,2-Nc)(CN)2]2 was isostructural to its non-magnetic analogue Ph4P[CoIII(1,2-Nc)(CN)2]2 but possessed higher electrical resistivity, indicating that the strong intramolecular π-d interaction is present in the [FeIII(1,2-Nc)(CN)2] unit. Although the magnetic interaction between π-conduction electrons and FeIII-d spins (π-d interaction) is crucial for the emergence of a negative magnetoresistance effect, the negative magnetoresistance effect of Ph4P[FeIII(1,2-Nc)(CN)2]2 was significantly smaller (-6% at 30 K under a static 9 T magnetic field) than those of Ph4P[FeIII(Pc)(CN)2]2 (-32%) and Ph4P[FeIII(tbp)(CN)2]2 (-13%) analogues (Pc = phthalocyanine and tbp = tetrabenzoporphyrin). This small negative magnetoresistance effect of Ph4P[FeIII(Pc)(CN)2]2 could be ascribed to the weak intermolecular antiferromagnetic interaction between its d spins. Hence, this study showed that constructing a molecular design for strengthening the intermolecular antiferromagnetic interaction is key to enhancing the negative magnetoresistance effect.
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Affiliation(s)
- Masayuki Yamaguchi
- Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
| | - Sayaka Iwamura
- Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
| | - Kosuke Mine
- Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
| | - Hiroshi Murakawa
- Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Noriaki Hanasaki
- Department of Physics, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Masaki Matsuda
- Department of Chemistry, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
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13
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Matsuoka R, Kimura S, Kusamoto T. Solid‐State Room‐Temperature Near‐Infrared Photoluminescence of a Stable Organic Radical. CHEMPHOTOCHEM 2021. [DOI: 10.1002/cptc.202100023] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Ryota Matsuoka
- Institute for Molecular Science 5-1 Higashiyama, Myodaiji Okazaki Aichi 444-8787 Japan
- SOKENDAI (The Graduate University for Advanced Studies) Shonan Village Hayama 240-0193 Kanagawa Japan
| | - Shojiro Kimura
- Institute for Materials Research Tohoku University 2-1-1 Katahira, Aoba-ku Sendai 980-8577 Japan
| | - Tetsuro Kusamoto
- Institute for Molecular Science 5-1 Higashiyama, Myodaiji Okazaki Aichi 444-8787 Japan
- SOKENDAI (The Graduate University for Advanced Studies) Shonan Village Hayama 240-0193 Kanagawa Japan
- JST-PRESTO 4-1-8, Honcho Kawaguchi Saitama 332-0012 Japan
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14
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Nishijo J, Uchida M, Enomoto M, Akita M. A chromium(III) bis-acetylide complex containing a trans-diethyl-ethylenedithio-substituted tetrathiafulvalene (TTF) derivative: synthesis, crystal structures, and magnetic properties. TRANSIT METAL CHEM 2021. [DOI: 10.1007/s11243-021-00453-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Li Z, Wu Q, Wu C. Surface/Interface Chemistry Engineering of Correlated-Electron Materials: From Conducting Solids, Phase Transitions to External-Field Response. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2002807. [PMID: 33643796 PMCID: PMC7887576 DOI: 10.1002/advs.202002807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 09/25/2020] [Indexed: 06/12/2023]
Abstract
Correlated electronic materials (CEMs) with strong electron-electron interactions are often associated with exotic properties, such as metal-insulator transition (MIT), charge density wave (CDW), superconductivity, and magnetoresistance (MR), which are fundamental to next generation condensed matter research and electronic devices. When the dimension of CEMs decreases, exposing extremely high specific surface area and enhancing electronic correlation, the surface states are equally important to the bulk phase. Therefore, surface/interface chemical interactions provide an alternative route to regulate the intrinsic properties of low-dimensional CEMs. Here, recent achievements in surface/interface chemistry engineering of low-dimensional CEMs are reviewed, using surface modification, molecule-solid interaction, and interface electronic coupling, toward modulation of conducting solids, phase transitions including MIT, CDW, superconductivity, and magnetism transition, as well as external-field response. Surface/interface chemistry engineering provides a promising strategy for exploring novel properties and functional applications in low-dimensional CEMs. Finally, the current challenge and outlook of the surface/interface engineering are also pointed out for future research development.
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Affiliation(s)
- Zejun Li
- Hefei National Laboratory for Physical Sciences at the MicroscaleCAS center for Excellence in Nanoscienceand CAS Key Laboratory of Mechanical Behavior and Design of MaterialsUniversity of Science and Technology of ChinaHefeiAnhui230026PR China
| | - Qiran Wu
- Hefei National Laboratory for Physical Sciences at the MicroscaleCAS center for Excellence in Nanoscienceand CAS Key Laboratory of Mechanical Behavior and Design of MaterialsUniversity of Science and Technology of ChinaHefeiAnhui230026PR China
| | - Changzheng Wu
- Hefei National Laboratory for Physical Sciences at the MicroscaleCAS center for Excellence in Nanoscienceand CAS Key Laboratory of Mechanical Behavior and Design of MaterialsUniversity of Science and Technology of ChinaHefeiAnhui230026PR China
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16
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Zhang E, Xu X, Huang C, Zou YC, Ai L, Liu S, Leng P, Jia Z, Zhang Y, Zhao M, Li Z, Yang Y, Liu J, Haigh SJ, Mao Z, Xiu F. Magnetic-Field-Induced Re-entrance of Superconductivity in Ta 2PdS 5 Nanostrips. NANO LETTERS 2021; 21:288-297. [PMID: 33346673 DOI: 10.1021/acs.nanolett.0c03655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The motion of Abrikosov vortices is the dominant origin of dissipation in type II superconductors subjected to a magnetic field, which leads to a finite electrical resistance. It is generally believed that the increase in the magnetic field results in the aggravation of energy dissipation through the increase in vortex density. Here, we show a distinctive re-entrance of the dissipationless state in quasi-one-dimensional superconducting Ta2PdS5 nanostrips. Utilizing magnetotransport measurements, we unveil a prominent magnetoresistance drop with the increase in the magnetic field below the superconducting transition temperature, manifesting itself as a giant re-entrance to the superconducting phase. Time-dependent Ginzburg-Landau calculations show that this is originated from the suppression of the vortex motion by the increased energy barrier on the edges. Interestingly, both our experiments and simulations demonstrate that this giant re-entrance of superconductivity occurs only in certain geometrical regimes because of the finite size of the vortex.
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Affiliation(s)
- Enze Zhang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Xian Xu
- School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
| | - Ce Huang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Yi-Chao Zou
- School of Materials, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Linfeng Ai
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Shanshan Liu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Pengliang Leng
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Zehao Jia
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Yuda Zhang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Minhao Zhao
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Zihan Li
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Yunkun Yang
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
| | - Jinyu Liu
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
| | - Sarah J Haigh
- School of Materials, University of Manchester, Manchester M13 9PL, United Kingdom
| | - Zhiqiang Mao
- Department of Physics, Penn State University, State College, Pennsylvania 16801, United States
| | - Faxian Xiu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- Institute for Nanoelectronic Devices and Quantum Computing, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
- Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
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17
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Jiang D, Yuan T, Wu Y, Wei X, Mu G, An Z, Li W. Strong In-Plane Magnetic Field-Induced Reemergent Superconductivity in the van der Waals Heterointerface of NbSe 2 and CrCl 3. ACS APPLIED MATERIALS & INTERFACES 2020; 12:49252-49257. [PMID: 33058667 DOI: 10.1021/acsami.0c15203] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A magnetic field is generally considered to be incompatible with superconductivity as it tends to spin-polarize electrons and breaks apart the opposite-spin singlet superconducting Cooper pairs. Here, an experimental phenomenon is observed that an intriguing reemergent superconductivity evolves from a conventional superconductivity undergoing a hump-like intermediate phase with a finite electric resistance in the van der Waals heterointerface of layered NbSe2 and CrCl3 flakes. This phenomenon merely occurred when the applied magnetic field is parallel to the sample plane and perpendicular to the electric current direction as compared to the reference sample of a NbSe2 thin flake. The strong anisotropy of the reemergent superconducting phase is pointed to the nature of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state driven by the strong interfacial spin-orbit coupling between NbSe2 and CrCl3 layers. The theoretical picture of FFLO state nodes induced by Josephson vortices collectively pinning is presented for well understanding the experimental observation of the reemergent superconductivity. This finding sheds light on an opportunity to search for the exotic FFLO state in the van der Waals heterostructures with strong interfacial spin-orbit coupling.
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Affiliation(s)
- Da Jiang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, and Center for Excellence in Superconducting Electronics, Chinese Academy of Science, Shanghai 200050, People's Republic of China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tianzhong Yuan
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
| | - Yongzheng Wu
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
| | - Xinyuan Wei
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
| | - Gang Mu
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, and Center for Excellence in Superconducting Electronics, Chinese Academy of Science, Shanghai 200050, People's Republic of China
| | - Zhenghua An
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
| | - Wei Li
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
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18
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Kushch ND, Kopotkov VA, Shilov GV, Akimov AV, Tokarev SV, Yagubskii EB, Zverev VN, Khasanov SS, Winter SM, Jeschke HO. Radical cation salts of BETS and ET with dicyanamidocuprate anions demonstrating metal-insulator and semiconductor–semiconductor transitions. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Sánchez‐Grande A, Urgel JI, Cahlík A, Santos J, Edalatmanesh S, Rodríguez‐Sánchez E, Lauwaet K, Mutombo P, Nachtigallová D, Nieman R, Lischka H, de la Torre B, Miranda R, Gröning O, Martín N, Jelínek P, Écija D. Diradical Organic One-Dimensional Polymers Synthesized on a Metallic Surface. Angew Chem Int Ed Engl 2020; 59:17594-17599. [PMID: 32592432 PMCID: PMC7540677 DOI: 10.1002/anie.202006276] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/08/2020] [Indexed: 11/28/2022]
Abstract
We report on the synthesis and characterization of atomically precise one-dimensional diradical peripentacene polymers on a Au(111) surface. By means of high-resolution scanning probe microscopy complemented by theoretical simulations, we provide evidence of their magnetic properties, which arise from the presence of two unpaired spins at their termini. Additionally, we probe a transition of their magnetic properties related to the length of the polymer. Peripentacene dimers exhibit an antiferromagnetic (S=0) singlet ground state. They are characterized by singlet-triplet spin-flip inelastic excitations with an effective exchange coupling (Jeff ) of 2.5 meV, whereas trimers and longer peripentacene polymers reveal a paramagnetic nature and feature Kondo fingerprints at each terminus due to the unpaired spin. Our work provides access to the precise fabrication of polymers featuring diradical character which are potentially useful in carbon-based optoelectronics and spintronics.
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Affiliation(s)
| | - José I. Urgel
- IMDEA NanoscienceC/ Faraday 9, Campus de Cantoblanco28049MadridSpain
| | - Aleš Cahlík
- Institute of Physics of the Czech Academy of Science16253PrahaCzech Republic
- Regional Centre of Advanced Technologies and MaterialsPalacký University Olomouc77146OlomoucCzech Republic
| | - José Santos
- IMDEA NanoscienceC/ Faraday 9, Campus de Cantoblanco28049MadridSpain
- Departamento de Química OrgánicaFacultad de Ciencias QuímicasUniversidad Complutense de Madrid28040MadridSpain
| | - Shayan Edalatmanesh
- Institute of Physics of the Czech Academy of Science16253PrahaCzech Republic
- Regional Centre of Advanced Technologies and MaterialsPalacký University Olomouc77146OlomoucCzech Republic
| | | | - Koen Lauwaet
- IMDEA NanoscienceC/ Faraday 9, Campus de Cantoblanco28049MadridSpain
| | - Pingo Mutombo
- Institute of Physics of the Czech Academy of Science16253PrahaCzech Republic
| | - Dana Nachtigallová
- Regional Centre of Advanced Technologies and MaterialsPalacký University Olomouc77146OlomoucCzech Republic
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Science16000PrahaCzech Republic
| | - Reed Nieman
- Department of Chemistry and BiochemistryTexas Tech UniversityLubbockTX79409USA
| | - Hans Lischka
- Department of Chemistry and BiochemistryTexas Tech UniversityLubbockTX79409USA
- School of Pharmaceutical Sciences and TechnologyTianjin UniversityTianjin300072P. R. China
| | - Bruno de la Torre
- Institute of Physics of the Czech Academy of Science16253PrahaCzech Republic
- Regional Centre of Advanced Technologies and MaterialsPalacký University Olomouc77146OlomoucCzech Republic
| | - Rodolfo Miranda
- IMDEA NanoscienceC/ Faraday 9, Campus de Cantoblanco28049MadridSpain
- Departamento de Física de la Materia CondensadaUniversidad Autónoma de Madrid28049MadridSpain
| | - Oliver Gröning
- EmpaSwiss Federal Laboratories for Materials Science and Technology8600DübendorfSwitzerland
| | - Nazario Martín
- IMDEA NanoscienceC/ Faraday 9, Campus de Cantoblanco28049MadridSpain
- Departamento de Química OrgánicaFacultad de Ciencias QuímicasUniversidad Complutense de Madrid28040MadridSpain
| | - Pavel Jelínek
- Institute of Physics of the Czech Academy of Science16253PrahaCzech Republic
- Regional Centre of Advanced Technologies and MaterialsPalacký University Olomouc77146OlomoucCzech Republic
| | - David Écija
- IMDEA NanoscienceC/ Faraday 9, Campus de Cantoblanco28049MadridSpain
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20
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Arczyński M, Pinkowicz D. Influence of the Increasing Number of Organic Radicals on the Structural, Magnetic, and Electrochemical Properties of the Copper(II)-Dioxothiadiazole Family of Complexes. Inorg Chem 2020; 59:13489-13501. [PMID: 32907320 PMCID: PMC7509843 DOI: 10.1021/acs.inorgchem.0c01904] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Indexed: 01/17/2023]
Abstract
The preparation, structures, and electrochemical and magnetic properties supported by density functional theory (DFT) calculations of three new copper(II) compounds with [1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 1,1-dioxide (td) and its radical anion (td·-) are reported: {[CuIICl(td)](μ-Cl)2[CuIICl(td)]} (1), which incorporates only neutral td ligands; [CuIICl(td·-)(td)]·2MeCN (2), which comprises one neutral td and one radical td·-; and PPN[CuIICl(td·-)2]·2DMA (3), where CuII ions are coordinated by two radical anions td·- (DMA, dimethylacetamide; PPN+, the bis(triphenylphosphine)iminium cation). All three compounds show interesting paramagnetic behavior with low-temperature features indicating significant antiferromagnetic coupling. The magnetic properties of 1 are dominated by CuII···CuII interactions (JCuCu) mediated through the Cl- bridges, while the magnetic properties of 2 and 3 are governed mainly by the td·-···td·- (Jtdtd) and CuII-td·- (JCutd) exchange interactions. The structure of 2 features only two major magnetic coupling pathways enabling the fitting of experimental data with Jtdtd = -36.0(5) cm-1 and JCutd = -12.6(2) cm-1 only. Compound 3 exhibits a complex network of magnetic contacts. Attempt to approximate its magnetic behavior using only a local magnetic contacts model resulted in Jtdtd = -5.6(1) cm-1 and two JCutd constants, -12.4(2) and -22.6(4) cm-1. The experimental fitting is critically compared with the results of broken symmetry density functional theory (BS DFT) calculations for inter- and intramolecular contacts. More consistent results were obtained with the M06 functional as opposed to popular B3LYP, which encountered problems reproducing some of the experimental intermolecular exchange interactions. Electrochemical measurements of 2 and 3 in MeCN showed three reversible nearly overlapping redox peaks appearing in a narrow potential range of -600 to -100 mV vs Fc/Fc+. Small differences between the redox events suggest that such compounds may be good candidates for new switchable materials, where the electron transfer between the metal and the ligand center is triggered by temperature, pressure, or light (valence tautomerism).
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Affiliation(s)
- Mirosław Arczyński
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
| | - Dawid Pinkowicz
- Jagiellonian University, Faculty of Chemistry, Gronostajowa 2, 30-387 Kraków, Poland
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21
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Shen Y, Ito H, Zhang H, Yamochi H, Katagiri S, Yoshina SK, Otsuka A, Ishikawa M, Cosquer G, Uchida K, Herrmann C, Yoshida T, Breedlove BK, Yamashita M. Simultaneous manifestation of metallic conductivity and single-molecule magnetism in a layered molecule-based compound. Chem Sci 2020; 11:11154-11161. [PMID: 34094356 PMCID: PMC8162363 DOI: 10.1039/d0sc04040a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Single-molecule magnets (SMMs) show superparamagnetic behaviour below blocking temperature at the molecular scale, so they exhibit large magnetic density compared to the conventional magnets. Combining SMMs and molecular conductors in one compound will bring about new physical phenomena, however, the synergetic effects between them still remain unexplored. Here we present a layered molecule-based compound, β′′-(BEDO-TTF)4 [Co(pdms)2]·3H2O (BO4), (BEDO-TTF (BO) and H2pdms are bis(ethylenedioxy)tetrathiafulvalene and 1,2-bis(methanesulfonamido)benzene, respectively), which was synthesized by using an electrochemical approach and studied by using crystal X-ray diffraction. This compound simultaneously exhibited metallic conductivity and SMM behaviour up to 11 K for the first time. The highest electrical conductivity was 400–650 S cm−1 at 6.5 K, which is the highest among those reported so far for conducting SMM materials. Furthermore, antiferromagnetic ordering occurred below 6.5 K, along with a decrease in conductivity, and the angle-independent negative magnetoresistance suggested an effective electron correlation between the conducting BO and Co(pdms)2 SMM layers (d–π interactions). The strong magnetic anisotropy and two-dimensional conducting plane play key roles in the low-temperature antiferromagnetic semiconducting state. BO4 is the first compound exhibiting antiferromagnetic ordering among SMMs mediated by π-electrons, demonstrating the synergetic effects between SMMs and molecular conductors. A metallic single-molecule magnet was synthesised demonstrating simultaneous metallic conduction and excellent SMM properties at the same temperature range for the first time, with potential applications in molecule-based quantum spintronics.![]()
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Affiliation(s)
- Yongbing Shen
- Department of Chemistry, Graduate School of Science, Tohoku University Sendai Japan
| | - Hiroshi Ito
- Department of Applied Physics, Nagoya University Chikusa-ku Nagoya 464-603 Japan
| | - Haitao Zhang
- Institute of Inorganic and Applied Chemistry, University of Hamburg Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Hideki Yamochi
- Division of Chemistry, Graduate School of Science, Kyoto University Sakyo-ku Kyoto 606-8502 Japan.,Research Center for Low Temperature and Materials Sciences, Kyoto University Sakyo-ku Kyoto 606-8501 Japan
| | - Seiu Katagiri
- Department of Applied Physics, Nagoya University Chikusa-ku Nagoya 464-603 Japan
| | - Shinji K Yoshina
- Department of Applied Physics, Nagoya University Chikusa-ku Nagoya 464-603 Japan
| | - Akihiro Otsuka
- Division of Chemistry, Graduate School of Science, Kyoto University Sakyo-ku Kyoto 606-8502 Japan.,Research Center for Low Temperature and Materials Sciences, Kyoto University Sakyo-ku Kyoto 606-8501 Japan
| | - Manabu Ishikawa
- Division of Chemistry, Graduate School of Science, Kyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Goulven Cosquer
- Research Group of Solid Material Chemistry, Graduate School of Science, Hiroshima University 1-3-1 Kagamiyama, Higashihiroshima Hiroshima 739-8526 Japan
| | - Kaiji Uchida
- Department of Chemistry, Graduate School of Science, Tohoku University Sendai Japan
| | - Carmen Herrmann
- Institute of Inorganic and Applied Chemistry, University of Hamburg Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Takefumi Yoshida
- Department of Chemistry, Graduate School of Science, Tohoku University Sendai Japan
| | - Brian K Breedlove
- Department of Chemistry, Graduate School of Science, Tohoku University Sendai Japan
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University Sendai Japan .,School of Materials Science and Engineering, Nankai University Tianjin 300350 China
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22
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Sánchez‐Grande A, Urgel JI, Cahlík A, Santos J, Edalatmanesh S, Rodríguez‐Sánchez E, Lauwaet K, Mutombo P, Nachtigallová D, Nieman R, Lischka H, Torre B, Miranda R, Gröning O, Martín N, Jelínek P, Écija D. Diradical Organic One‐Dimensional Polymers Synthesized on a Metallic Surface. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202006276] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ana Sánchez‐Grande
- IMDEA Nanoscience C/ Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
| | - José I. Urgel
- IMDEA Nanoscience C/ Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
| | - Aleš Cahlík
- Institute of Physics of the Czech Academy of Science 16253 Praha Czech Republic
- Regional Centre of Advanced Technologies and Materials Palacký University Olomouc 77146 Olomouc Czech Republic
| | - José Santos
- IMDEA Nanoscience C/ Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
- Departamento de Química Orgánica Facultad de Ciencias Químicas Universidad Complutense de Madrid 28040 Madrid Spain
| | - Shayan Edalatmanesh
- Institute of Physics of the Czech Academy of Science 16253 Praha Czech Republic
- Regional Centre of Advanced Technologies and Materials Palacký University Olomouc 77146 Olomouc Czech Republic
| | | | - Koen Lauwaet
- IMDEA Nanoscience C/ Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
| | - Pingo Mutombo
- Institute of Physics of the Czech Academy of Science 16253 Praha Czech Republic
| | - Dana Nachtigallová
- Regional Centre of Advanced Technologies and Materials Palacký University Olomouc 77146 Olomouc Czech Republic
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Science 16000 Praha Czech Republic
| | - Reed Nieman
- Department of Chemistry and Biochemistry Texas Tech University Lubbock TX 79409 USA
| | - Hans Lischka
- Department of Chemistry and Biochemistry Texas Tech University Lubbock TX 79409 USA
- School of Pharmaceutical Sciences and Technology Tianjin University Tianjin 300072 P. R. China
| | - Bruno Torre
- Institute of Physics of the Czech Academy of Science 16253 Praha Czech Republic
- Regional Centre of Advanced Technologies and Materials Palacký University Olomouc 77146 Olomouc Czech Republic
| | - Rodolfo Miranda
- IMDEA Nanoscience C/ Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
- Departamento de Física de la Materia Condensada Universidad Autónoma de Madrid 28049 Madrid Spain
| | - Oliver Gröning
- Empa Swiss Federal Laboratories for Materials Science and Technology 8600 Dübendorf Switzerland
| | - Nazario Martín
- IMDEA Nanoscience C/ Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
- Departamento de Química Orgánica Facultad de Ciencias Químicas Universidad Complutense de Madrid 28040 Madrid Spain
| | - Pavel Jelínek
- Institute of Physics of the Czech Academy of Science 16253 Praha Czech Republic
- Regional Centre of Advanced Technologies and Materials Palacký University Olomouc 77146 Olomouc Czech Republic
| | - David Écija
- IMDEA Nanoscience C/ Faraday 9, Campus de Cantoblanco 28049 Madrid Spain
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23
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Spontaneous Magnetization and Optical Activity in the Chiral Series {(L-proline)nV[Cr(CN)6]x} (0 < n < 3). MAGNETOCHEMISTRY 2020. [DOI: 10.3390/magnetochemistry6010012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The incorporation of the natural amino acid L-proline in the synthesis to vanadium-chromium Prussian blue derivatives results in materials exhibiting magnetic ordering including chiral magnetic centers. Although the amorphous nature of these materials makes difficult to assess the structural features of these proline-containing compounds, magnetic and spectroscopic data confirms their multifunctionality. They exhibit high-temperature magnetic ordering (Tc < 255 K) and a circular dichroic signal, representing the molecule-based chiral magnets with the highest ordering temperatures reported to date. In addition, the presence of chiral L-proline (or D-proline) has additional benefits, including higher redox stability and the appearance of magnetic hysteresis. The latter was not observed in the parent compounds, the series of room temperature molecule-based magnets V[Cr(CN)6]x.
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24
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Cador O, Le Guennic B, Ouahab L, Pointillart F. Decorated Tetrathiafulvalene-Based Ligands: Powerful Chemical Tools for the Design of Single-Molecule Magnets. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900981] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Olivier Cador
- ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226; Univ Rennes, CNRS; F-35000 Rennes France
| | - Boris Le Guennic
- ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226; Univ Rennes, CNRS; F-35000 Rennes France
| | - Lahcène Ouahab
- ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226; Univ Rennes, CNRS; F-35000 Rennes France
| | - Fabrice Pointillart
- ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226; Univ Rennes, CNRS; F-35000 Rennes France
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25
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Sahadevan SA, Abhervé A, Monni N, Auban-Senzier P, Cano J, Lloret F, Julve M, Cui H, Kato R, Canadell E, Mercuri ML, Avarvari N. Magnetic Molecular Conductors Based on Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) and the Tris(chlorocyananilato)ferrate(III) Complex. Inorg Chem 2019; 58:15359-15370. [PMID: 31657914 DOI: 10.1021/acs.inorgchem.9b02404] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Electrocrystallization of the bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) organic donor in the presence of the [Fe(ClCNAn)3]3- tris(chlorocyananilato)ferrate(III) paramagnetic anion in different stoichiometric ratios and solvent mixtures afforded two different hybrid systems formulated as [BEDT-TTF]4[Fe(ClCNAn)3]·3H2O (1) and [BEDT-TTF]5[Fe(ClCNAn)3]2·2CH3CN (2) (An = anilato). Compounds 1 and 2 present unusual structures without the typical segregated organic and inorganic layers, where layers of 1 are formed by Λ and Δ enantiomers of the anionic paramagnetic complex together with mixed-valence BEDT-TTF tetramers, while layers of 2 are formed by Λ and Δ enantiomers of the paramagnetic complex together with dicationic BEDT-TTF dimers and monomers. Compounds 1 and 2 show semiconducting behaviors with room-temperature conductivities of ca. 6 × 10-3 S cm-1 (ambient pressure) and 1 × 10-3 S cm-1 (under applied pressure of 12.1 GPa), respectively, due to strong dimerization between the donors. Magnetic measurements performed on compound 1 indicate weak antiferromagnetic coupling between high-spin FeIII (SFe = 5/2) and mixed-valence radical cation diyads (BEDT-TTF)2+ (Srad = 1/2) mediated by the anilate ligands, together with an important Pauli paramagnetism typical for conducting systems.
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Affiliation(s)
- Suchithra Ashoka Sahadevan
- MOLTECH-Anjou , UMR 6200, CNRS, UNIV Angers , 2 bd Lavoisier , 49045 Angers , Cedex , France.,Dipartimento di Scienze Chimiche e Geologiche , Università degli Studi di Cagliari , S.S. 554-Bivio per Sestu , I09042 Monserrato , Cagliari , Italy
| | - Alexandre Abhervé
- MOLTECH-Anjou , UMR 6200, CNRS, UNIV Angers , 2 bd Lavoisier , 49045 Angers , Cedex , France
| | - Noemi Monni
- Dipartimento di Scienze Chimiche e Geologiche , Università degli Studi di Cagliari , S.S. 554-Bivio per Sestu , I09042 Monserrato , Cagliari , Italy
| | - Pascale Auban-Senzier
- Laboratoire de Physique des Solides, UMR 8502, Bât. 510 , CNRS-Université Paris-Sud , 91405 Orsay , France
| | - Joan Cano
- Departament de Química Inorgànica, Instituto de Ciencia Molecular , Universitat de València , 46980 Paterna , València , Spain
| | - Francesc Lloret
- Departament de Química Inorgànica, Instituto de Ciencia Molecular , Universitat de València , 46980 Paterna , València , Spain
| | - Miguel Julve
- Departament de Química Inorgànica, Instituto de Ciencia Molecular , Universitat de València , 46980 Paterna , València , Spain
| | - Hengbo Cui
- Condensed Molecular Materials Laboratory , RIKEN, 2-1 Hirosawa , 351-0198 Wako , Saitama , Japan
| | - Reizo Kato
- Condensed Molecular Materials Laboratory , RIKEN, 2-1 Hirosawa , 351-0198 Wako , Saitama , Japan
| | - Enric Canadell
- Institut de Ciència de Materials de Barcelona , Campus de la UAB , E-08193 Bellaterra , Spain
| | - Maria Laura Mercuri
- Dipartimento di Scienze Chimiche e Geologiche , Università degli Studi di Cagliari , S.S. 554-Bivio per Sestu , I09042 Monserrato , Cagliari , Italy
| | - Narcis Avarvari
- MOLTECH-Anjou , UMR 6200, CNRS, UNIV Angers , 2 bd Lavoisier , 49045 Angers , Cedex , France
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26
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Pauli-limit upper critical field of high-temperature superconductor La 1.84Sr 0.16CuO 4. Sci Rep 2019; 9:16949. [PMID: 31740679 PMCID: PMC6861275 DOI: 10.1038/s41598-019-52973-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 10/26/2019] [Indexed: 11/09/2022] Open
Abstract
The upper critical field of a cuprate high-temperature superconductor, La1.84Sr0.16CuO4, was investigated by high-frequency self-resonant contactless electrical conductivity measurements in magnetic fields up to 102 T. An irreversible transition was observed at 85 T (T = 4.2 K), defined as the upper critical field. The temperature-dependent upper critical field was argued on the basis of the Werthamer-Helfand-Hohenberg theory. The Pauli-limiting pair-breaking process with a small contribution of the spin-orbit coupling explained the first-order phase transition exhibiting a hysteresis observed at low temperatures.
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27
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Yoshida Y, Maesato M, Saito G, Kitagawa H. Conducting Coronene Cation Radical Salt Containing Magnetic Metal Ions. Inorg Chem 2019; 58:14068-14074. [PMID: 31599584 DOI: 10.1021/acs.inorgchem.9b02080] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Coronene is the smallest homologue of benzene and is the smallest fragment of graphene among 6-fold symmetric polycyclic aromatic hydrocarbons. In this study, we obtained the first coronene cation radical solid containing magnetic counterions by an electrochemical method. Coronene monocations in the 1:1 salt, (coronene•+)(FeBr4-), assemble in a stacking manner via π-π interactions, which lead to a rather high room-temperature conductivity of 0.6 S cm-1. The salt shows semiconducting behavior as expected from the calculated band structure, and activation energies were estimated to be 0.25 eV at T ≥ 220 K and 0.18 eV at T ≤ 220 K. The magnetic susceptibility follows the Curie-Weiss law down to about 30 K, with a Curie constant (4.47 emu K mol-1) expected for S = 5/2 spins of iron(III) ions and a high Weiss temperature (-32.2 K). Upon further cooling, the salt exhibits a susceptibility kink at 16.2 K followed by the loss of a significant fraction of the susceptibility due to long-range antiferromagnetic ordering. Theoretical calculations predicted that the indirect π-d magnetic exchange interaction through C-H···Br hydrogen bonds is equal to Jπd = -3.10 K. Although the absolute value is lower than that of the direct d-d magnetic exchange interaction between the FeBr4- anions (Jdd = -13.35 K), it is evident that the π-d interactions play a certain role in determining the magnetic behavior. Considering that an isomorphous salt, (coronene•+)(GaBr4-) involving a nonmagnetic counterpart GaBr4-, exhibits singlet-triplet magnetic behavior with a spin gap of 1.44 × 103 K, it is most likely that in (coronene)(FeBr4) the nonmagnetic π-electrons serve as mediators of the magnetic ordering of d-spins through the π-d interactions.
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Affiliation(s)
- Yukihiro Yoshida
- Division of Chemistry, Graduate School of Science , Kyoto University , Kitashirakawa-Oiwakecho, Sakyo-ku , Kyoto 606-8502 , Japan
| | - Mitsuhiko Maesato
- Division of Chemistry, Graduate School of Science , Kyoto University , Kitashirakawa-Oiwakecho, Sakyo-ku , Kyoto 606-8502 , Japan
| | - Gunzi Saito
- Toyota Physical and Chemical Research Institute , Yokomichi 41-1 , Nagakute 480-1192 , Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science , Kyoto University , Kitashirakawa-Oiwakecho, Sakyo-ku , Kyoto 606-8502 , Japan
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28
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Hung NQ, Dang ND, Moretto LG. Pairing in excited nuclei: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2019; 82:056301. [PMID: 30736024 DOI: 10.1088/1361-6633/ab05ac] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The present review summarizes the recent studies on the thermodynamic properties of pairing in many-body systems including superconductors, metallic nanosized clusters and/or grains, solid-state materials, focusing on the excited nuclei, that is nuclei at finite temperature and/or angular momentum formed via heavy-ion fusion, [Formula: see text]-induced fusion reactions, or inelastic scattering of light particles on heavy targets. Because of the finiteness of the systems, several interesting effects of pairing such as nonvanishing pairing gap, smoothing of superfluid-normal phase transition, first and second order phase transitions, pairing reentrance, etc, will be discussed in detail. Influences of exact and approximate thermal pairing on some nuclear properties such as temperature-dependent width of the giant dipole resonance, total level density, and radiative strength function of the [Formula: see text]-rays emission will be also analyzed. Finally, the first experimental evidence of the pairing reentrance phenomenon in a 104Pd nucleus as well as its solid-state counterpart of ferromagnets under strong magnetic field will be presented.
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Affiliation(s)
- N Quang Hung
- Institute of Fundamental and Applied Sciences, Duy Tan University, Ho Chi Minh city 700000, Vietnam
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29
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Zapata-Rivera J, Calzado CJ. Light-Induced Control of the Spin Distribution on Cu–Dithiolene Complexes: A Correlated Ab Initio Study. Molecules 2019; 24:molecules24061088. [PMID: 30893883 PMCID: PMC6470791 DOI: 10.3390/molecules24061088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Revised: 03/12/2019] [Accepted: 03/14/2019] [Indexed: 11/16/2022] Open
Abstract
Metal dithiolene complexes—M(dmit)2—are key building blocks for magnetic, conducting, and optical molecular materials, with singular electronic structures resulting from the mixing of the metal and dmit ligand orbitals. Their use in the design of magnetic and conducting materials is linked to the control of the unpaired electrons and their localized/delocalized nature. It has been recently found that UV–Vis light can control the spin distribution of some [Cu(dmit)2]−2 salts in a direct and reversible way. In this work, we study the optical response of these salts and the origin of the differences observed in the EPR spectra under UV–Vis irradiation by means of wave function-based quantum chemistry methods. The low-lying states of the complex have been characterized and the electronic transitions with a non-negligible oscillator strength have been identified. The population of the corresponding excited states promoted by the UV–Vis absorption produces significant changes in the spin distribution, and could explain the changes observed in the system upon illumination. The interaction between neighbor [Cu(dmit)2]−2 complexes is weakly ferromagnetic, consistent with the relative orientation of the magnetic orbitals and the crystal packing, but in disagreement with previous assignments. Our results put in evidence the complex electronic structure of the [Cu(dmit)2]−2 radical and the relevance of a multideterminantal approach for an adequate analysis of their properties.
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Affiliation(s)
- Jhon Zapata-Rivera
- Facultad de Ciencias Básicas and Universidad Tecnológica de Bolívar, Campus Tecnológico s/n, 131001 Cartagena, Colombia.
| | - Carmen J Calzado
- Departamento de Química Física, Universidad de Sevilla, c/Prof. García González and s/n, 41012 Sevilla, Spain.
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30
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Magnetic and Electronic Properties of π-d Interacting Molecular Magnetic Superconductor κ-(BETS)2FeX4 (X = Cl, Br) Studied by Angle-Resolved Heat Capacity Measurements. CRYSTALS 2019. [DOI: 10.3390/cryst9020066] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Thermodynamic picture induced by π-d interaction in a molecular magnetic superconductor κ-(BETS)2FeX4 (X = Cl, Br), where BETS is bis(ethylenedithio)tetraselenafulvalene, studied by single crystal calorimetry is reviewed. Although the S = 5/2 spins of Fe3+ in the anion layers form a three-dimensional long-range ordering with nearly full entropy of Rln6, a broad hump structure appears in the temperature dependence of the magnetic heat capacity only when the magnetic field is applied parallel to the a axis, which is considered as the magnetic easy axis. The scaling of the temperature dependence of the magnetic heat capacity of the two salts is possible using the parameter of |Jdd|/kB and therefore the origin of the hump structure is related to the direct magnetic interaction, Jdd, that is dominant in the system. Quite unusual crossover from a three-dimensional ordering to a one-dimensional magnet occurs when magnetic fields are applied parallel to the a axis. A notable anisotropic field-direction dependence against the in-plane magnetic field was also observed in the transition temperature of the bulk superconductivity by the angle-resolved heat capacity measurements. We discuss the origin of this in-plane anisotropy in terms of the 3d electron spin configuration change induced by magnetic fields.
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31
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Ran S, Liu IL, Eo YS, Campbell DJ, Neves PM, Fuhrman WT, Saha SR, Eckberg C, Kim H, Graf D, Balakirev F, Singleton J, Paglione J, Butch NP. Extreme magnetic field-boosted superconductivity. NATURE PHYSICS 2019; 15:10.1038/s41567-019-0670-x. [PMID: 34131432 PMCID: PMC8201648 DOI: 10.1038/s41567-019-0670-x] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 08/21/2019] [Indexed: 05/31/2023]
Abstract
Applied magnetic fields underlie exotic quantum states, such as the fractional quantum Hall effect1 and Bose-Einstein condensation of spin excitations2. Superconductivity, however, is inherently antagonistic towards magnetic fields. Only in rare cases3-5 can these effects be mitigated over limited fields, leading to re-entrant superconductivity. Here, we report the coexistence of multiple high-field re-entrant superconducting phases in the spin-triplet superconductor UTe2 (ref. 6). We observe superconductivity in the highest magnetic field range identified for any re-entrant superconductor, beyond 65 T. Although the stability of superconductivity in these high magnetic fields challenges current theoretical models, these extreme properties seem to reflect a new kind of exotic superconductivity rooted in magnetic fluctuations7 and boosted by a quantum dimensional crossover8.
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Affiliation(s)
- Sheng Ran
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA
| | - I-Lin Liu
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA
| | - Yun Suk Eo
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
| | - Daniel J. Campbell
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
| | - Paul M. Neves
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
| | - Wesley T. Fuhrman
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
| | - Shanta R. Saha
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Christopher Eckberg
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
| | - Hyunsoo Kim
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
| | - David Graf
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA
| | - Fedor Balakirev
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM, USA
| | - John Singleton
- National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM, USA
- Department of Physics, The Clarendon Laboratory, University of Oxford, Oxford, UK
| | - Johnpierre Paglione
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Nicholas P. Butch
- Center for Nanophysics and Advanced Materials, Department of Physics, University of Maryland, College Park, MD, USA
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, USA
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32
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Hoshino N, Akutagawa T. A Trinuclear Iron(III) Complex of a Triple Noninnocent Ligand for Spin‐Structured Molecular Conductors. Chemistry 2018; 24:19323-19331. [DOI: 10.1002/chem.201804280] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2018] [Revised: 09/24/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Norihisa Hoshino
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM)Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980–8577 Japan
| | - Tomoyuki Akutagawa
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM)Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980–8577 Japan
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33
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Rewriting the phase diagram of a diamagnetic liquid crystal by a magnetic field. Nat Commun 2018; 9:4431. [PMID: 30361534 PMCID: PMC6202376 DOI: 10.1038/s41467-018-06976-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 10/05/2018] [Indexed: 11/09/2022] Open
Abstract
Magnetic fields have been considered to only interact with organic materials non-destructively, leaving their fundamental structures unaffected, even when a strong magnetic field generated from a superconducting magnet is applied. Here we report an unprecedented observation that a liquid-crystalline mesophase of a diamagnetic molecular assembly with an orthorhombic or a cubic structure is formed selectively in the absence or presence of a strong magnetic field. The constituent molecule is a triphenylene derivative carrying six imidazolium bromide-terminated alkyl side chains and exhibits a cubic, orthorhombic, or hexagonal columnar mesophase when complexed with an appropriate amount of lanthanum(III) bromide. Thermal processing of the La3+-containing liquid-crystalline assembly in the presence of a 10-tesla magnetic field resulted in a phase diagram, in which the orthorhombic phase is completely replaced with the cubic phase. The discovery of this magneto-induced phase-selection offers an insight into the interactions between magnetic fields and organic material. Magnetically induced phase behaviour in a soft matter system is of potential interest for magneto-responsive compounds. Here the authors fabricate a discotic ionic liquid crystalline hybrid material which can be switched from orthorhombic to cubic phase in the absence or presence of a strong magnetic field.
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34
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Sahadevan SA, Abhervé A, Monni N, Sáenz de Pipaón C, Galán-Mascarós JR, Waerenborgh JC, Vieira BJC, Auban-Senzier P, Pillet S, Bendeif EE, Alemany P, Canadell E, Mercuri ML, Avarvari N. Conducting Anilate-Based Mixed-Valence Fe(II)Fe(III) Coordination Polymer: Small-Polaron Hopping Model for Oxalate-Type Fe(II)Fe(III) 2D Networks. J Am Chem Soc 2018; 140:12611-12621. [DOI: 10.1021/jacs.8b08032] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Suchithra Ashoka Sahadevan
- Laboratoire MOLTECH-Anjou UMR 6200, UFR Sciences, CNRS, Université d’Angers, Bât. K, 2 Bd. Lavoisier, 49045 Angers, France
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, I-09042 Monserrato (Cagliari), Italy
| | - Alexandre Abhervé
- Laboratoire MOLTECH-Anjou UMR 6200, UFR Sciences, CNRS, Université d’Angers, Bât. K, 2 Bd. Lavoisier, 49045 Angers, France
| | - Noemi Monni
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, I-09042 Monserrato (Cagliari), Italy
| | - Cristina Sáenz de Pipaón
- Institute of Chemical Research of Catalonia, The Barcelona Institute of Science and Technology (BIST), Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - José Ramón Galán-Mascarós
- Institute of Chemical Research of Catalonia, The Barcelona Institute of Science and Technology (BIST), Avenida Països Catalans 16, 43007 Tarragona, Spain
- ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
| | - João C. Waerenborgh
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal
| | - Bruno J. C. Vieira
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal
| | - Pascale Auban-Senzier
- Laboratoire de Physique des Solides, UMR 8502, Bât. 510, CNRS-Université Paris-Sud, 91405 Orsay, France
| | | | | | - Pere Alemany
- Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
| | - Enric Canadell
- Institut de Ciència de Materials de Barcelona (CSIC), Campus de la UAB, E-08193 Bellaterra, Spain
| | - Maria Laura Mercuri
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, I-09042 Monserrato (Cagliari), Italy
| | - Narcis Avarvari
- Laboratoire MOLTECH-Anjou UMR 6200, UFR Sciences, CNRS, Université d’Angers, Bât. K, 2 Bd. Lavoisier, 49045 Angers, France
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35
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Calzado CJ, Rodríguez-García B, Galán Mascarós JR, Hernández NC. Electronic Structure and Magnetic Interactions in the Radical Salt [BEDT-TTF] 2[CuCl 4]. Inorg Chem 2018; 57:7077-7089. [PMID: 29877697 DOI: 10.1021/acs.inorgchem.7b03240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The magnetic behavior and electric properties of the hybrid radical salt [BEDT-TTF]2[CuCl4] have been revisited through extended experimental analyses and DDCI and periodic DFT plane waves calculations. Single crystal X-ray diffraction data have been collected at different temperatures, discovering a phase transition occurring in the 250-300 K range. The calculations indicate the presence of intradimer, interdimer, and organic-inorganic π-d interactions in the crystal, a magnetic pattern much more complex than the Bleaney-Bowers model initially assigned to this material. Although this simple model was good enough to reproduce the magnetic susceptibility data, our calculations demonstrate that the actual magnetic structure is significantly more intricate, with alternating antiferromagnetic 1D chains of the organic BEDT-TTF+ radical, connected through weak antiferromagnetic interactions with the CuCl42- ions. Combination of experiment and theory allowed us to unambiguously determine and quantify the leading magnetic interactions in the system. The density-of-states curves confirm the semiconductor nature of the system and the dominant organic contribution of the valence and conduction band edges. This general and combined approach appears to be fundamental in order to properly understand the magnetic structure of these complex materials, where experimental data can actually be fitted from a variety of models and parameters.
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Affiliation(s)
- Carmen J Calzado
- Departamento de Química Física , Universidad de Sevilla , c/Profesor García González, s/n , E-41012 , Sevilla , Spain
| | - Bárbara Rodríguez-García
- Institute of Chemical Research of Catalonia (ICIQ) , The Barcelona Institute of Science and Technology (BIST) , Av. Països Catalans, 16 , Tarragona , E-43007 , Spain
| | - José Ramón Galán Mascarós
- Institute of Chemical Research of Catalonia (ICIQ) , The Barcelona Institute of Science and Technology (BIST) , Av. Països Catalans, 16 , Tarragona , E-43007 , Spain.,ICREA , Pg. Lluís Companys, 23 , E-08010 , Barcelona , Spain
| | - Norge Cruz Hernández
- Departamento de Física Aplicada I, Escuela Politécnica Superior , Universidad de Sevilla , Sevilla , E-41011 , Spain
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36
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Kushch ND, Buravov LI, Kushch PP, Shilov GV, Yamochi H, Ishikawa M, Otsuka A, Shakin AA, Maximova OV, Volkova OS, Vasiliev AN, Yagubskii EB. Multifunctional Compound Combining Conductivity and Single-Molecule Magnetism in the Same Temperature Range. Inorg Chem 2018; 57:2386-2389. [PMID: 29465234 DOI: 10.1021/acs.inorgchem.7b03152] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the first highly conducting single-molecule magnet, (BEDO)4[ReF6]·6H2O [1; BEDO = bis(ethylenedioxo)tetrathiafulvalene], whose conductivity and single-molecule magnetism coexist in the same temperature range. The compound was synthesized by BEDO electrocrystallization in the presence of (Ph4P)2[ReF6]·2H2O and characterized by crystallography and measurements of the conductivity and alternating-current magnetic susceptibility.
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Affiliation(s)
- Nataliya D Kushch
- Institute of Problems of Chemical Physics , Russian Academy of Sciences , Chernogolovka 142432 , Russia
| | - Lev I Buravov
- Institute of Problems of Chemical Physics , Russian Academy of Sciences , Chernogolovka 142432 , Russia
| | - Pavel P Kushch
- Institute of Problems of Chemical Physics , Russian Academy of Sciences , Chernogolovka 142432 , Russia
| | - Gennadii V Shilov
- Institute of Problems of Chemical Physics , Russian Academy of Sciences , Chernogolovka 142432 , Russia
| | - Hideki Yamochi
- Division of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan.,Research Center for Low Temperature and Materials Sciences , Kyoto University , Sakyo-ku, Kyoto 606-8501 , Japan
| | - Manabu Ishikawa
- Research Center for Low Temperature and Materials Sciences , Kyoto University , Sakyo-ku, Kyoto 606-8501 , Japan
| | - Akihiro Otsuka
- Division of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan.,Research Center for Low Temperature and Materials Sciences , Kyoto University , Sakyo-ku, Kyoto 606-8501 , Japan
| | - Alexander A Shakin
- National University of Science and Technology "MISiS" , Moscow 119049 , Russia
| | - Olga V Maximova
- National University of Science and Technology "MISiS" , Moscow 119049 , Russia.,Lomonosov Moscow State University , Moscow 119991 , Russia
| | - Olga S Volkova
- National University of Science and Technology "MISiS" , Moscow 119049 , Russia.,Lomonosov Moscow State University , Moscow 119991 , Russia
| | - Alexander N Vasiliev
- National University of Science and Technology "MISiS" , Moscow 119049 , Russia.,Lomonosov Moscow State University , Moscow 119991 , Russia.,National Research South Ural State University , Chelyabinsk 454080 , Russia
| | - Eduard B Yagubskii
- Institute of Problems of Chemical Physics , Russian Academy of Sciences , Chernogolovka 142432 , Russia
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37
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Sánchez-de-Armas R, Calzado CJ. Evaluation of the Giant Ferromagnetic π-d Interaction in Iron-Phthalocyanine Molecule. J Phys Chem A 2018; 122:1678-1690. [PMID: 29338233 DOI: 10.1021/acs.jpca.7b11356] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The interaction between itinerant π and localized d electrons in metal-phthalocyanines, namely, Jπd interaction, is considered as responsible for the giant negative magnetoresistance observed in several phthalocyanine-based conductors, among many other important physical properties. Despite the fundamental and technological importance of this on-site intramolecular interaction, its giant ferromagnetic nature has been only recently demonstrated by the experiments conducted by Murakawa et al. in the neutral radical [Fe(Pc)(CN)2]·2CHCl3 ( Phys. Rev. B 2015 , 92 , 054429 ). In this article, we present the theoretical evaluation of this interaction combining wave function-based electronic calculations on isolated Fe(Pc)(CN)2 molecules and density functional theory-based periodic calculations on the crystal. Our calculations confirm the ferromagnetic nature of the π-d interaction, with a coupling constant as large as Jπd/kB = 570 K, in excellent agreement with the experiments, and the presence of intermolecular antiferromagnetic interactions driven by the π-π overlap of neighboring phthalocyaninato molecules. The analysis of the wave function of the ground state of the Fe(Pc)(CN)2 molecule provides the clues of the origin of this giant ferromagnetic π-d interaction.
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Affiliation(s)
- Rocío Sánchez-de-Armas
- Departamento de Química Física, Universidad de Sevilla , c/Profesor García González, s/n, E-41012 Sevilla, Spain
| | - Carmen J Calzado
- Departamento de Química Física, Universidad de Sevilla , c/Profesor García González, s/n, E-41012 Sevilla, Spain
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38
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Zhao P, Bu Y. Remarkable Differences in Spin Couplings for Various Self-Paired Dimers of Ring-Expansion-Radicalized Uracil: A Basis for the Design of Magnetically Anisotropic Assemblies. Chemphyschem 2018; 19:208-219. [PMID: 29165931 DOI: 10.1002/cphc.201701068] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Indexed: 11/09/2022]
Abstract
The spin-coupling properties of a series of radicalized uracil (rU) dimer diradicals with different H-bonding modes is examined. Each rU has four double H-bonding sites [the amide units: two at the Watson-Crick face (upper site WC1 and lower site WC2 ), a Hoogsteen site (HO), and a minor-groove site (MI)], and ten homogeneous dimers (rU-rU) can self-pair with well-defined diradical characters and comparable stability to the native U dimers. More interestingly, all these dimers exhibit distinctly different spin-coupling characters (ferromagnetic (FM) versus antiferromagnetic (AFM) and large- versus small-magnitude spin couplings), indicative of remarkable magnetic-coupling anisotropy of rU. This observation originates from the fusion of a cyclopentadienyl radical to U, which leads to uneven spin-density distribution. In rU, the fused five-membered radical ring can spin-polarize to the edge in the minor groove, and thus dimerization of rU leads to different H-bonded structures with remarkably different magnetic couplings. The calculated larger magnetic coupling constants J are 1003.7 and 540.2 cm-1 for the WC2 -HO and MI-HO H-bonding modes between rU, which exhibit considerably large FM couplings, the MI-MI, WC1 -WC2 and WC2 -WC2 modes show moderate FM couplings (J=0.4-77 cm-1 ), and the other modes exhibit moderate or weak AFM couplings. These observations indicate that the HO and MI sites are favorable spin-coupling sites. In addition, the H-bond lengths and electronic structures of the H-bonding sites, proton transfer, and extra H-bonding interaction with the surroundings can also affect the magnetic couplings of the base pairs. Clearly, the unique magnetic coupling anisotropy of rU provides a promising application basis for the design and assembly of bio-inspired anisotropically magnetic membranes and even magnetism-tunable building blocks for novel magnetic nanoscale devices.
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Affiliation(s)
- Peiwen Zhao
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China
| | - Yuxiang Bu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.,School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, P. R. China
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39
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Cosquer G, Shen Y, Almeida M, Yamashita M. Conducting single-molecule magnet materials. Dalton Trans 2018; 47:7616-7627. [DOI: 10.1039/c8dt01015c] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multifunctional molecular materials exhibiting electrical conductivity and single-molecule magnet (SMM) behaviour are particularly attractive for electronic devices and related applications owing to the interaction between electronic conduction and magnetization of unimolecular units.
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Affiliation(s)
- Goulven Cosquer
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Yongbing Shen
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Manuel Almeida
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Masahiro Yamashita
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
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40
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Sarbadhikary P, Shil S, Misra A. Magnetic and transport properties of conjugated and cumulated molecules: the π-system enlightens part of the story. Phys Chem Chem Phys 2018; 20:9364-9375. [DOI: 10.1039/c7cp06113g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have investigated the intramolecular magnetic exchange coupling constants (J) for a series of nitronyl nitroxide diradicals connected by a range of linear conjugated and cumulene couplers focusing on the unusual π-interaction properties within the couplers.
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Affiliation(s)
| | - Suranjan Shil
- Center for Atomic-scale Materials Design (CAMD)
- Department of Physics
- Technical University of Denmark
- Lyngby
- Denmark
| | - Anirban Misra
- Department of Chemistry
- University of North Bengal
- Dist-Darjeeling 734013
- India
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41
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Niwata M, Masutomi R, Okamoto T. Magnetic-Field-Induced Superconductivity in Ultrathin Pb Films with Magnetic Impurities. PHYSICAL REVIEW LETTERS 2017; 119:257001. [PMID: 29303336 DOI: 10.1103/physrevlett.119.257001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Indexed: 06/07/2023]
Abstract
It is well known that external magnetic fields and magnetic moments of impurities both suppress superconductivity. Here, we demonstrate that their combined effect enhances the superconductivity of a few atomic layer thick Pb films grown on a cleaved GaAs(110) surface. A Ce-doped film, where superconductivity is totally suppressed at a zero field, actually turns superconducting when an external magnetic field is applied parallel to the conducting plane. For films with Mn adatoms, the screening of the magnetic moment by conduction electrons, i.e., the Kondo singlet formation, becomes important. We found that the degree of screening can be reduced by capping the Pb film with a Au layer, and observed the positive magnetic field dependence of the superconducting transition temperature.
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Affiliation(s)
- Masato Niwata
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Ryuichi Masutomi
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Tohru Okamoto
- Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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42
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Nishijo J, Shima Y, Enomoto M. Synthesis, crystal structures and magnetic properties of new chromium(III)–acetylide–TTF type complexes. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.03.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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43
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Organic field-effect transistor based on paramagnetic Cu(II) neutral complexes coordinated by Schiff base-type TTF ligands. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.03.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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44
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Kishi Y, Cornet L, Pointillart F, Riobé F, Lefeuvre B, Cador O, Le Guennic B, Maury O, Fujiwara H, Ouahab L. Luminescence and Single-Molecule-Magnet Behaviour in Lanthanide Coordination Complexes Involving Benzothiazole-Based Tetrathiafulvalene Ligands. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700893] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yosuke Kishi
- Institut des Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1; 263 Avenue du Général Leclerc 35042 Rennes Cedex France
- Department of Chemistry; Graduate School of Science; Osaka Prefecture University; 1-1 Gakuen-cho 599-8531 Naka-ku, Sakai Osaka Japan
| | - Louis Cornet
- Institut des Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1; 263 Avenue du Général Leclerc 35042 Rennes Cedex France
| | - Fabrice Pointillart
- Institut des Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1; 263 Avenue du Général Leclerc 35042 Rennes Cedex France
| | - François Riobé
- Laboratoire de Chimie; UMR 5182 CNRS-ENS Lyon - Université Lyon 1; 46 Allée d'Italie 69364 Lyon Cedex France
| | - Bertrand Lefeuvre
- Institut des Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1; 263 Avenue du Général Leclerc 35042 Rennes Cedex France
| | - Olivier Cador
- Institut des Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1; 263 Avenue du Général Leclerc 35042 Rennes Cedex France
| | - Boris Le Guennic
- Institut des Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1; 263 Avenue du Général Leclerc 35042 Rennes Cedex France
| | - Olivier Maury
- Laboratoire de Chimie; UMR 5182 CNRS-ENS Lyon - Université Lyon 1; 46 Allée d'Italie 69364 Lyon Cedex France
| | - Hideki Fujiwara
- Department of Chemistry; Graduate School of Science; Osaka Prefecture University; 1-1 Gakuen-cho 599-8531 Naka-ku, Sakai Osaka Japan
| | - Lahcène Ouahab
- Institut des Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1; 263 Avenue du Général Leclerc 35042 Rennes Cedex France
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45
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Sarkar S, Goswami T, Bhattacharya D, Misra A. On the performance of generalized valence bond theory in predicting magnetic exchange coupling constant in organic diradicals: A comparison with Hartree-Fock theory. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.03.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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46
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Recent Advances on Anilato-Based Molecular Materials with Magnetic and/or Conducting Properties. MAGNETOCHEMISTRY 2017. [DOI: 10.3390/magnetochemistry3020017] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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47
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Yoshizawa S, Minamitani E, Vijayaraghavan S, Mishra P, Takagi Y, Yokoyama T, Oba H, Nitta J, Sakamoto K, Watanabe S, Nakayama T, Uchihashi T. Controlled Modification of Superconductivity in Epitaxial Atomic Layer-Organic Molecule Heterostructures. NANO LETTERS 2017; 17:2287-2293. [PMID: 28358199 DOI: 10.1021/acs.nanolett.6b05010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Self-assembled organic molecules can potentially be an excellent source of charge and spin for two-dimensional (2D) atomic-layer superconductors. Here we investigate 2D heterostructures based on In atomic layers epitaxially grown on Si and highly ordered metal-phthalocyanine (MPc, M = Mn, Cu) through a variety of techniques: scanning tunneling microscopy, electron transport measurements, angle-resolved photoemission spectroscopy, X-ray magnetic circular dichroism, and ab initio calculations. We demonstrate that the superconducting transition temperature (Tc) of the heterostructures can be modified in a controllable manner. Particularly, the substitution of the coordinated metal atoms from Mn to Cu is found to reverse the Tc shift from negative to positive directions. This distinctive behavior is attributed to a competition of charge and spin effects, the latter of which is governed by the directionality of the relevant d-orbitals. The present study shows the effectiveness of molecule-induced surface doping and the significance of microscopic understanding of the molecular states in these 2D heterostructures.
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Affiliation(s)
- Shunsuke Yoshizawa
- International Center for Young Scientists (ICYS), National Institute for Materials Science , 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Emi Minamitani
- Department of Materials Engineering, The University of Tokyo , 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Saranyan Vijayaraghavan
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science , 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Puneet Mishra
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science , 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Yasumasa Takagi
- Institute for Molecular Science , Myoudaiji Campus, 38 Nishigo-Naka, Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Toshihiko Yokoyama
- Institute for Molecular Science , Myoudaiji Campus, 38 Nishigo-Naka, Myodaiji, Okazaki, Aichi 444-8585, Japan
| | - Hiroaki Oba
- Department of Nanomaterials Science, Graduate School of Advanced Integration Science, Chiba University , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Jun Nitta
- Department of Nanomaterials Science, Graduate School of Advanced Integration Science, Chiba University , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Kazuyuki Sakamoto
- Department of Nanomaterials Science, Graduate School of Advanced Integration Science, Chiba University , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Satoshi Watanabe
- Department of Materials Engineering, The University of Tokyo , 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tomonobu Nakayama
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science , 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Takashi Uchihashi
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science , 1-1, Namiki, Tsukuba, Ibaraki 305-0044, Japan
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48
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Antiferromagnetic Insulating Ground State of Molecular π-d System Λ-(BETS)2FeCl4 (BETS = Bis(ethylenedithio)tetraselenafulvalene): A Theoretical and Experimental Review. MAGNETOCHEMISTRY 2017. [DOI: 10.3390/magnetochemistry3010010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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49
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Feng Y, Zhang F, Song X, Bu Y. Diradicalized biphenyl derivative carbon-based material molecules: exploring the tuning effects on magnetic couplings. Phys Chem Chem Phys 2017; 19:5932-5943. [PMID: 28177009 DOI: 10.1039/c6cp08201g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
While the conductance behavior of carbon-based couplers has been successfully investigated, insight into the magnetic properties of such carbon-based molecule coupled diradical systems is still scarce, and especially the structural effect of such couplers on the magnetic properties is poorly understood. The present work reports three different interference effects on the magnetic properties of carbon-based molecule coupled nitroxide diradicals: twisting, sideways group, and position effects. DFT calculations reveal that (i) torsion does not change their broken-symmetry singlet ground state and antiferromagnetic coupling, but decreases their magnetism; (ii) different linkages of two radical moieties result in different ground states and thus different magnetisms, depending on a combination of meta-sites and para-sites; (iii) the antiferromagnetic coupling with a broken-symmetry singlet ground state is not changed by adding sideways groups, but the coupling magnitude can be tuned by modifying the side-bridge. Discussions on geometries, magnetic properties, SOMO-SOMO splittings, and spin density distributions are made to clarify relevant magnetic behaviors. Clearly, the findings concerning the regulation of the diradicalized material molecules through modifying the carbon-based bridges provide a comprehensive understanding of the magnetism of such carbon-based diradicals and new prospects for the design of building blocks of magnetic functional molecular materials.
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Affiliation(s)
- Yiwei Feng
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.
| | - Fengying Zhang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.
| | - Xinyu Song
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.
| | - Yuxiang Bu
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.
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50
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The Highly Conducting Spin-Crossover Compound Combining Fe(III) Cation Complex with TCNQ in a Fractional Reduction State. Synthesis, Structure, Electric and Magnetic Properties. MAGNETOCHEMISTRY 2017. [DOI: 10.3390/magnetochemistry3010009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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