1
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Jezierski D, Mazej Z, Grochala W. Novel ternary Ag IICo IIIF 5 fluoride: synthesis, structure and magnetic characteristics. Dalton Trans 2024; 53:13731-13742. [PMID: 38666360 DOI: 10.1039/d4dt00419a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/21/2024]
Abstract
We present a new compound in the silver-cobalt-fluoride system, featuring paramagnetic silver (d9) and high-spin cobalt (d6), synthesized by solid-state method in an autoclave under F2 overpressure. Based on powder X-ray diffraction, we determined that AgIICoIIIF5 crystallizes in a monoclinic system with space group C2/c. The calculated fundamental band-gap falls in the visible range of the electromagnetic spectrum, and the compound has the character of charge-transfer insulator. AgCoF5 is likely a ferrimagnet with one predominant superexchange magnetic interaction constant between mixed spin cations (Ag-Co) of -62 meV (SCAN result). Magnetometric measurements conducted on a powdered sample allowed the identification of a transition at 128 K, which could indicate magnetic ordering.
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Affiliation(s)
- Daniel Jezierski
- Center of New Technologies, University of Warsaw, 02089 Warsaw, Poland.
| | - Zoran Mazej
- Department of Inorganic Chemistry and Technology, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia.
| | - Wojciech Grochala
- Center of New Technologies, University of Warsaw, 02089 Warsaw, Poland.
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2
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Domański M, van Leusen J, Metzelaars M, Kögerler P, Grochala W. Ag(II) as Spin Super-Polarizer in Molecular Spin Clusters. J Phys Chem A 2022; 126:9618-9626. [PMID: 36521028 PMCID: PMC9806831 DOI: 10.1021/acs.jpca.2c06032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Using quantum mechanical calculations, we examine magnetic (super)exchange interactions in hypothetical, chemically reasonable molecular coordination clusters containing fluoride-bridged late transition metals or selected lanthanides, as well as Ag(II). By referencing to analogous species comprising closed-shell Cd(II), we provide theoretical evidence that the presence of Ag(II) may modify the magnetic properties of such systems (including metal-metal superexchange) to a surprising degree, specifically both coupling sign and strength may markedly change. Remarkably, this happens in spite of the fact that the fluoride ligand is the least susceptible to spin polarization among all monoatomic ligands known in chemistry. In an extreme case of an oxo-bridged Ni(II)2 complex, the presence of Ag(II) leads to a nearly 17-fold increase of magnetic superexchange and switching from antiferro (AFM)- to ferromagnetic (FM) coupling. Ag(II)─with one hole in its d shell that may be shared with or transferred to ligands─effectively acts as spin super-polarizer, and this feature could be exploited in spintronics and diverse molecular devices.
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Affiliation(s)
- Mateusz Domański
- Center
of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02089Warsaw, Poland
| | - Jan van Leusen
- Institut
für Anorganische Chemie, RWTH Aachen
University, 52056Aachen, Germany
| | - Marvin Metzelaars
- Institut
für Anorganische Chemie, RWTH Aachen
University, 52056Aachen, Germany
| | - Paul Kögerler
- Institut
für Anorganische Chemie, RWTH Aachen
University, 52056Aachen, Germany,
| | - Wojciech Grochala
- Center
of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02089Warsaw, Poland,
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3
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Wolański Ł, Metzelaars M, van Leusen J, Kögerler P, Grochala W. Structural Phase Transitions and Magnetic Superexchange in M I Ag II F 3 Perovskites at High Pressure. Chemistry 2022; 28:e202200712. [PMID: 35352859 PMCID: PMC9320850 DOI: 10.1002/chem.202200712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Indexed: 11/09/2022]
Abstract
Pressure-induced phase transitions of MI AgII F3 perovskites (M=K, Rb, Cs) have been predicted theoretically for the first time for pressures up to 100 GPa. The sequence of phase transitions for M=K and Rb consists of a transition from orthorhombic to monoclinic and back to orthorhombic, associated with progressive bending of infinite chains of corner-sharing [AgF6 ]4- octahedra and their mutual approach through secondary Ag⋅⋅⋅F contacts. In stark contrast, only a single phase transition (tetragonal→triclinic) is predicted for CsAgF3 ; this is associated with substantial deformation of the Jahn-Teller-distorted first coordination sphere of AgII and association of the infinite [AgF6 ]4- chains into a polymeric sublattice. The phase transitions markedly decrease the coupling strength of intra-chain antiferromagnetic superexchange in MAgF3 hosts lattices.
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Affiliation(s)
- Łukasz Wolański
- Centre of New TechnologiesUniversity of WarsawS. Banacha 2c02-097WarsawPoland
| | - Marvin Metzelaars
- Institute of Inorganic ChemistryRWTH Aachen University52074AachenGermany
| | - Jan van Leusen
- Institute of Inorganic ChemistryRWTH Aachen University52074AachenGermany
| | - Paul Kögerler
- Institute of Inorganic ChemistryRWTH Aachen University52074AachenGermany
- Peter Grünberg Institute (PGI-6)Forschungszentrum Jülich GmbH52425JülichGermany
| | - Wojciech Grochala
- Centre of New TechnologiesUniversity of WarsawS. Banacha 2c02-097WarsawPoland
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4
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Phase Transitions and Amorphization of M2AgF4 (M = Na, K, Rb) Compounds at High Pressure. CRYSTALS 2022. [DOI: 10.3390/cryst12040458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
We report the results of high-pressure Raman spectroscopy studies of alkali metal fluoroargentates (M2AgF4, where M = Na, K, Rb) combined with theoretical and X-ray diffraction studies for the K member of the series. Theoretical density functional calculations predict two structural phase transitions for K2AgF4: one from low-pressure monoclinic P21/c (beta) phase to intermediate-pressure tetragonal I42d structure at 6 GPa, and another to high-pressure triclinic P1 phase at 58 GPa. However, Raman spectroscopy and X-ray diffraction data indicate that both polymorphic forms of K2AgF4, as well as two other fluoroargentate phases studied here, undergo amorphization at pressures as low as several GPa.
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5
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Koteras K, Gawraczyński J, Tavčar G, Mazej Z, Grochala W. Crystal structure, lattice dynamics and superexchange in MAgF3 1D antiferromagnets (M = K, Rb, Cs) and a Rb3Ag2F7 Ruddlesden–Popper phase. CrystEngComm 2022. [DOI: 10.1039/d1ce01545a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With the use of lattice dynamics calculation within the hybrid HSE06 framework we were able to understand the vibrational spectra of MAgF3 (M = K, Rb, Cs) compounds.
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Affiliation(s)
- Kacper Koteras
- Centre of New Technologies, University of Warsaw, S. Banacha 2C, 02-097 Warsaw, Poland
| | - Jakub Gawraczyński
- Centre of New Technologies, University of Warsaw, S. Banacha 2C, 02-097 Warsaw, Poland
| | - Gašper Tavčar
- Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Zoran Mazej
- Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia
| | - Wojciech Grochala
- Centre of New Technologies, University of Warsaw, S. Banacha 2C, 02-097 Warsaw, Poland
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6
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Domański MA, Grochala W. The fate of compound with AgF 2:AgO stoichiometry-A theoretical study. J Chem Phys 2021; 154:204705. [PMID: 34241151 DOI: 10.1063/5.0049707] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Metal oxyfluorides constitute a broad group of chemical compounds with a rich spectrum of crystal structures and properties. Surprisingly though, none of the ternary oxyfluorides contains a cation from group 11 of the periodic table. Intending to find one, we focused on the silver derivative, the Ag2OF2 system, which may be considered as the 1:1 "adduct" of AgF2 (i.e., an antiferromagnetic positive U charge transfer insulator) and AgO (i.e., a diamagnetic disproportionated negative charge transfer insulator). Here, possible crystal structures of the silver oxyfluoride were studied using evolutionary algorithms based on the density functional theory approach. We analyzed the oxidation states of silver in the low-energy structures, possible magnetic interactions, and energetic stability with respect to the available substrates. Our findings suggest that silver oxyfluoride, if obtained, may form a metastable crystal with cations in three different oxidation states of the same element. Due to the small energy difference, existence of a fully disproportionated metallic compound cannot be ruled out. Finally, we outlined a prospect for the synthesis of polytypes of interest using diverse synthetic approaches, starting from the direct fluorination of Ag2O.
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Affiliation(s)
- Mateusz A Domański
- Center of New Technologies, University of Warsaw, Żwirki i Wigury 93, 02089 Warsaw, Poland
| | - Wojciech Grochala
- Center of New Technologies, University of Warsaw, Żwirki i Wigury 93, 02089 Warsaw, Poland
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7
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Abstract
Theoretical DFT calculations using GGA+U and HSE06 frameworks enabled vibrational mode assignment and partial (atomic) phonon DOS determination in KAgF3 perovskite, a low-dimensional magnetic fluoroargentate(II). Twelve bands in the spectra of KAgF3 were assigned to either IR active or Raman active modes, reaching excellent correlation with experimental values (R2 > 0.997). Low-temperature Raman measurements indicate that the intriguing spin-Peierls-like phase transition at 230 K is an order–disorder transition and it does not strongly impact the vibrational structure of the material.
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8
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Gawraczyński J, Kurzydłowski D, Ewings RA, Bandaru S, Gadomski W, Mazej Z, Ruani G, Bergenti I, Jaroń T, Ozarowski A, Hill S, Leszczyński PJ, Tokár K, Derzsi M, Barone P, Wohlfeld K, Lorenzana J, Grochala W. Silver route to cuprate analogs. Proc Natl Acad Sci U S A 2019; 116:1495-1500. [PMID: 30651308 PMCID: PMC6358696 DOI: 10.1073/pnas.1812857116] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The parent compound of high-[Formula: see text] superconducting cuprates is a unique Mott insulator consisting of layers of spin-[Formula: see text] ions forming a square lattice and with a record high in-plane antiferromagnetic coupling. Compounds with similar characteristics have long been searched for without success. Here, we use a combination of experimental and theoretical tools to show that commercial [Formula: see text] is an excellent cuprate analog with remarkably similar electronic parameters to [Formula: see text] but larger buckling of planes. Two-magnon Raman scattering and inelastic neutron scattering reveal a superexchange constant reaching 70% of that of a typical cuprate. We argue that structures that reduce or eliminate the buckling of the [Formula: see text] planes could have an antiferromagnetic coupling that matches or surpasses the cuprates.
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Affiliation(s)
- Jakub Gawraczyński
- Center of New Technologies, University of Warsaw, 02089 Warsaw, Poland
- Faculty of Chemistry, University of Warsaw, 02093 Warsaw, Poland
| | - Dominik Kurzydłowski
- Center of New Technologies, University of Warsaw, 02089 Warsaw, Poland
- Faculty of Mathematics and Natural Sciences, Cardinal Stefan Wyszyński University in Warsaw, 01938 Warsaw, Poland
| | - Russell A Ewings
- ISIS Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | | | | | - Zoran Mazej
- Department of Inorganic Chemistry and Technology, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia
| | - Giampiero Ruani
- Institute of Nanostructured Materials (ISMN), Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy
| | - Ilaria Bergenti
- Institute of Nanostructured Materials (ISMN), Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy
| | - Tomasz Jaroń
- Center of New Technologies, University of Warsaw, 02089 Warsaw, Poland
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310
| | - Stephen Hill
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310
- Department of Physics, Florida State University, Tallahassee, FL 32306
| | | | - Kamil Tokár
- Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia
- Advanced Technologies Research Institute, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, 917 24 Trnava, Slovakia
| | - Mariana Derzsi
- Center of New Technologies, University of Warsaw, 02089 Warsaw, Poland
- Advanced Technologies Research Institute, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, 917 24 Trnava, Slovakia
| | - Paolo Barone
- Superconducting and Other Innovative Materials and Devices Institute (SPIN), Consiglio Nazionale delle Ricerche, 66100 Chieti, Italy
| | | | - José Lorenzana
- Institute for Complex Systems (ISC), Consiglio Nazionale delle Ricerche, Dipartimento di Fisica, Università di Roma "La Sapienza," 00185 Rome, Italy
| | - Wojciech Grochala
- Center of New Technologies, University of Warsaw, 02089 Warsaw, Poland;
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9
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Kurzydłowski D, Grochala W. Prediction of Extremely Strong Antiferromagnetic Superexchange in Silver(II) Fluorides: Challenging the Oxocuprates(II). Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700932] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dominik Kurzydłowski
- Center of New Technologies; University of Warsaw; Banacha 2c 02097 Warsaw Poland
- Faculty of Mathematics and Natural Sciences; Cardinal Stefan Wyszyński University in Warsaw; Wóycickiego 1/3 01938 Warsaw Poland
| | - Wojciech Grochala
- Center of New Technologies; University of Warsaw; Banacha 2c 02097 Warsaw Poland
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10
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Kurzydłowski D, Grochala W. Prediction of Extremely Strong Antiferromagnetic Superexchange in Silver(II) Fluorides: Challenging the Oxocuprates(II). Angew Chem Int Ed Engl 2017; 56:10114-10117. [DOI: 10.1002/anie.201700932] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 04/19/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Dominik Kurzydłowski
- Center of New Technologies; University of Warsaw; Banacha 2c 02097 Warsaw Poland
- Faculty of Mathematics and Natural Sciences; Cardinal Stefan Wyszyński University in Warsaw; Wóycickiego 1/3 01938 Warsaw Poland
| | - Wojciech Grochala
- Center of New Technologies; University of Warsaw; Banacha 2c 02097 Warsaw Poland
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11
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Mazej Z, Gilewski T, Goreshnik EA, Jagličić Z, Derzsi M, Grochala W. Canted Antiferromagnetism in Two-Dimensional Silver(II) Bis[pentafluoridooxidotungstate(VI)]. Inorg Chem 2016; 56:224-233. [DOI: 10.1021/acs.inorgchem.6b02034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zoran Mazej
- Department of Inorganic Chemistry and Technology, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Tomasz Gilewski
- CENT, University of Warsaw, Żwirki i Wigury 93, 02-089 Warsaw, Poland
- Faculty of Chemistry, University of Warsaw, Pasteur 1, 02-093 Warsaw, Poland
| | - Evgeny A. Goreshnik
- Department of Inorganic Chemistry and Technology, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Zvonko Jagličić
- Faculty of Civil and Geodetic
Engineering, and Institute of Mathematics, Physics and Mechanics, University of Ljubljana, Jadranska 19, SI-1000 Ljubljana, Slovenia
| | - Mariana Derzsi
- CENT, University of Warsaw, Żwirki i Wigury 93, 02-089 Warsaw, Poland
| | - Wojciech Grochala
- CENT, University of Warsaw, Żwirki i Wigury 93, 02-089 Warsaw, Poland
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12
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Kurzydłowski D, Jaroń T, Ozarowski A, Hill S, Jagličić Z, Filinchuk Y, Mazej Z, Grochala W. Local and Cooperative Jahn–Teller Effect and Resultant Magnetic Properties of M2AgF4 (M = Na–Cs) Phases. Inorg Chem 2016; 55:11479-11489. [DOI: 10.1021/acs.inorgchem.6b02037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dominik Kurzydłowski
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097, Warsaw, Poland
- Faculty
of Mathematics and Natural Sciences, Cardinal Stefan Wyszynski University in Warsaw, Wóycickiego 1/3, 01-938, Warsaw, Poland
| | - Tomasz Jaroń
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097, Warsaw, Poland
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Stephen Hill
- National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States
- Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Zvonko Jagličić
- Faculty of Civil and Geodetic Engineering,
Institute of Mathematics, Physics and Mechanics, University of Ljubljana, Jadranska 19, SI-1000, Ljubljana, Slovenia
| | - Yaroslav Filinchuk
- Institute of Condensed
Matter and Nanosciences, Université Catholique de Louvain, Place L. Pasteur, B-1348, Louvain-la-Neuve, Belgium
| | - Zoran Mazej
- Department
of Inorganic Chemistry and Technology, Jožef Stefan Institute, Jamova
39, SI-1000, Ljubljana, Slovenia
| | - Wojciech Grochala
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097, Warsaw, Poland
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13
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Kurzydłowski D, Derzsi M, Mazej Z, Grochala W. Crystal, electronic, and magnetic structures of M2AgF4 (M = Na–Cs) phases as viewed from the DFT+U method. Dalton Trans 2016; 45:16255-16261. [DOI: 10.1039/c6dt03125k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Theoretical analysis of various polymorphic forms of a series of four alkali metal fluoroargentates(ii), M2AgF4 (M = Na–Cs), helped to establish clear trends of crystal structures and magnetic properties across the alkali metal series.
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Affiliation(s)
- Dominik Kurzydłowski
- Centre of New Technologies
- University of Warsaw
- Warsaw
- Poland
- Faculty of Mathematics and Natural Sciences
| | - Mariana Derzsi
- Centre of New Technologies
- University of Warsaw
- Warsaw
- Poland
| | - Zoran Mazej
- Department of Inorganic Chemistry and Technology
- Jožef Stefan Institute
- SI-1000 Ljubljana
- Slovenia
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14
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Malinowski PJ, Kurzydłowski D, Grochala W. AgPO2F2 and Ag9(PO2F2)14: the first Ag(i) and Ag(i)/Ag(ii) difluorophosphates with complex crystal structures. Dalton Trans 2015. [PMID: 26200921 DOI: 10.1039/c5dt02004b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of AgF2 with P2O3F4 yields a mixed valence Ag(I)/Ag(II) difluorophosphate salt with AgAg(PO2F2)14 stoichiometry - the first Ag(ii)-PO2F2 system known. This highly moisture sensitive brown solid is thermally stable up to 120 °C, which points at further feasible extension of the chemistry of Ag(ii)-PO2F2 systems. The crystal structure shows a very complex bonding pattern, comprising of polymeric Ag(PO2F2)14(4-) anions and two types of Ag(I) cations. One particular Ag(II) site present in the crystal structure of Ag9(PO2F2)14 is the first known example of square pyramidal penta-coordinated Ag(ii) in an oxo-ligand environment. Ag(i)PO2F2 - the product of the thermal decomposition of Ag9(PO2F2)14 - has also been characterized by thermal analysis, IR spectroscopy and X-ray powder diffraction. It has a complicated crystal structure as well, which consists of infinite 1D [Ag(I)O4/2] chains which are linked to more complex 3D structures via OPO bridges. The PO2F2(-) anions bind to cations in both compounds as bidentate oxo-ligands. The terminal F atoms tend to point inside the van der Waals cavities in the crystal structure of both compounds. All important structural details of both title compounds were corroborated by DFT calculations.
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Affiliation(s)
- Przemysław J Malinowski
- Laboratory of Technology of Novel Functional Materials, Center of New Technologies, University of Warsaw, ul. S. Banacha 2c, 02-097, Warsaw, Poland.
| | - Dominik Kurzydłowski
- Laboratory of Technology of Novel Functional Materials, Center of New Technologies, University of Warsaw, ul. S. Banacha 2c, 02-097, Warsaw, Poland. and Faculty of Mathematics and Natural Sciences, Cardinal Stefan Wyszynski University in Warsaw, ul. Wóycickiego 1/3, 01-938, Warsaw, Poland
| | - Wojciech Grochala
- Laboratory of Technology of Novel Functional Materials, Center of New Technologies, University of Warsaw, ul. S. Banacha 2c, 02-097, Warsaw, Poland.
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15
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Yang X, Su H. Electronic Properties of Fluoride and Half-fluoride Superlattices KZnF3/KAgF3 and SrTiO3/KAgF3. Sci Rep 2015; 5:15849. [PMID: 26514917 PMCID: PMC4626782 DOI: 10.1038/srep15849] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Accepted: 10/01/2015] [Indexed: 11/16/2022] Open
Abstract
We present the formation of cupratelike electronic structures in KAgF3-related superlattices resulted from the confinement together with structural chemical modification by using the generalized gradient approximation augmented with maximally localized Wannier functions analysis. Strong antiferromagnetic coupling found in bulk KAgF3 is held in purely-fluoride KZnF3/KAgF3. Under 4% in-plane compression strain, its Fermi surface shape breaks away from the edge of electron pocket and resembles that of La2CuO4. While within half-fluoride SrTiO3/KAgF3, out-of-plane electronic reconstruction results in electron doping of AgF2 plane and antiferromagnetic state instability, and the Fermi surface shape presents considerable similarity to that in HgBaCuO4. These results shed light on two dimensional antiferromagnetic precursors of a new Ag(II) family of high-temperature superconductors.
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Affiliation(s)
- Xiaoping Yang
- Institute of Advanced Studies, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
| | - Haibin Su
- Institute of Advanced Studies, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
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16
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Pedersen KS, Sørensen MA, Bendix J. Fluoride-coordination chemistry in molecular and low-dimensional magnetism. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2015.03.024] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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17
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Grochala W, Mazej Z. Chemistry of silver(II): a cornucopia of peculiarities†. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2015; 373:rsta.2014.0179. [PMID: 25666068 DOI: 10.1098/rsta.2014.0179] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Silver is the heavier congener of copper in the Periodic Table, but the chemistry of these two elements is very different. While Cu(II) is the most common cationic form of copper, Ag(II) is rare and its compounds exhibit a broad range of peculiar physico-chemical properties. These include, but are not limited to: (i) uncommon oxidizing properties, (ii) unprecedented large mixing of metal and ligand valence orbitals, (iii) strong spin-polarization of neighbouring ligands, (iv) record large magnetic superexchange constants, (v) ease of thermal decomposition of its salts with O-, N- or C-ligands, as well as (vi) robust Jahn-Teller effect which is preserved even at high pressure. These intriguing features of the compounds of Ag(II) will be discussed here together with (vii) a possibility of electromerism (electronic tautomerism) for a certain class of Ag(II) salts.
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Affiliation(s)
- Wojciech Grochala
- Centre of New Technologies, University of Warsaw, Zwirki i Wigury 93, 02089 Warsaw, Poland
| | - Zoran Mazej
- Department of Inorganic Chemistry and Technology, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
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