Struktur‐ und magnetochemische Untersuchungen an KCuGaF<sub>6</sub>

Dahlke, P.; Pebler, J.; Babel, D.

doi:10.1002/zaac.200400436

Cited by 16 publications

(9 citation statements)

References 38 publications

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“…The Cu-F bonds that have identical bond lengths are trans to each other. This distribution of Cu-F bond lengths has been previously observed in KCuGaF 6 [14] and ACuF 3 (A = Ag, Na). [15] In CuFAsF 6 the Cu is therefore in a rather peculiar environment, that is, with two short bonds and four long ones (2 + 4), while in H 3 OCuF[AsF 6 ] 2 the highly rhombic distribution of the Cu-F(As) bond lengths makes it uncertain whether this should be treated as a Jahn-Teller compressed or elongated structure.…”

Section: Crystal Structures Of H 3 Om[asf 6 ] 3 (M = Mn Fe Co Ni supporting

confidence: 83%

Syntheses and Crystal Structures of [H₃O]⁺/M²⁺ (M = Fe, Zn, Cu, Hg) Salts with [AsF₆]^–

2012

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The H3OM[AsF6]3 (M = Fe, Zn), H3OMF[AsF6]2 (M = Fe, Cu) and (H3O)2Hg2F[AsF6]5 compounds were prepared by treatment of the corresponding divalent oxide MO (M = Zn, Cu, Hg) with AsF5 in anhydrous HF (aHF) or by reaction between H3OAsF6, FeF2 and AsF5 in aHF. The H3OM[AsF6]3 (M = Fe, Zn) compounds crystallize isotypically to previously known compounds where M is Mn, Co and Ni. The H3OMF[AsF6]2 (M = Fe, Cu) crystal structures consist of one‐dimensional infinite zig‐zag [–M–F–M–] chains. Each M2+ is additionally bridged by two pairs of [AsF6] units with neighbouring M2+ atoms forming columns along the y axis. [H3O]+ cations are placed between the columns. In H3OCuF[AsF6]2 each of the Cu atoms is coordinated by six fluorine atoms {2 × 1.850(2) Å within the [–Cu–F–Cu–] chains and four Cu–F(As) bonds with 2 × 2.067(4) Å and 2 × 2.254(5) Å}. There is a pronounced antiferromagnetic coupling (J/kB = –150 K) within the [–Cu–F–Cu–] chains. In H3OFeF[AsF6]2 the corresponding values are 2 × 1.919(2) Å, 2 × 2.184(3) Å and 2 × 2.208(4) Å. (H3O)2Hg2F[AsF6]5 crystallizes isotypically to previously known (H3O)2Cd2F[SbF6]5. No oxonium–M2+–[AsF6]– salts were observed when M was Ti, V, Cr, Nb, Pd, Ag, Cd, Sn and Pb.

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Section: Crystal Structures Of H 3 Om[asf 6 ] 3 (M = Mn Fe Co Ni supporting

confidence: 83%

Syntheses and Crystal Structures of [H₃O]⁺/M²⁺ (M = Fe, Zn, Cu, Hg) Salts with [AsF₆]^–

2012

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“…Die Resultate der Einkristall-Strukturbestimmungen an den sieben kubischen Pyrochloren sind in Tabelle [6] ϭ 73 pm) zu KZ5 (r Cu [5] ϭ 65 pm) mit 8 pm angegeben wird [32]. Eine Illustration hierzu bietet die Struktur von CsCu 2 F 5 , in der nebeneinander die Koordinationszahlen 4, 5 und 6 realisiert sind und die mittleren Abstände Cu-F: 190,3 bzw.…”

Section: Ergebnisse Und Diskussionunclassified

Zur Kristallstruktur von Pyrochloren: Mössbauer‐Spektrum von orthorhombischem CsFe₂F₆ und röntgenographische Einkristall‐Untersuchungen an den kubischen Verbindungen CsMgGaF₆, CsM^IIV^IIIF₆ (M^II = Mn, Zn), CsM^IIFe^IIIF₆ (M^II = Mn, Cu, Zn) und Cs₄Cu₅V₃O₂F₁₉

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Dahlke

Kaiser

et al. 2006

Zeitschrift anorg allge chemie

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“…17) Cu 2þ and Ga 3þ ions surrounded octahedrally by six F À ions form a pyrochlore lattice. Since Cu 2þ ions with spin 1/2 are arranged almost straightforward along the c-axis and neighboring Ga 3þ ions are nonmagnetic, the exchange interaction between neighboring Cu 2þ ions should have one-dimensional (1D) nature.…”

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Thermodynamic Properties and Elementary Excitations in Quantum Sine-Gordon Spin System KCuGaF₆

et al. 2007

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Thermodynamic properties and elementary excitations in S ¼ 1=2 one-dimensional Heisenberg antiferromagnet KCuGaF 6 were investigated by magnetic susceptibility, specific heat and ESR measurements. Due to the Dzyaloshinsky-Moriya interaction with alternating D-vectors and/or the staggered g-tensor, the staggered magnetic field is induced when subjected to external magnetic field. Specific heat in magnetic field clearly shows the formation of excitation gap, which is attributed to the staggered magnetic field. The specific heat data was analyzed on the basis of the quantum sine-Gordon (SG) model. We observed many ESR modes including one soliton and three breather excitations characteristic of the quantum SG model. Studies of antiferromagnetic Heisenberg chain (AFHC) have long history. For S ¼ 1=2 uniform AFHC, the ground state, thermodynamic properties and magnetic excitations are well understood with the help of exact solutions [1][2][3][4] and accurate analytical and numerical calculations.5-8) These theoretical results demonstrate the importance of the quantum fluctuation characteristic of low-dimensional systems. In particular, exact result of the magnetic excitations in an external magnetic field H is qualitatively different from the results of the linear spin wave theory. The gapless excitations occur at incommensurate wave vectors q ¼ AE2mðHÞ and AE 2mðHÞ in addition to at q ¼ 0 and , where mðHÞ is the magnetization per site in the unit of g B . 4)Recently, the physics of S ¼ 1=2 AFHC in staggered magnetic field induced by the external magnetic field has been attracting considerable attention.9,10) The model Hamiltonian of such system is written aswhere h is the staggered field perpendicular to the external field H and is given by h ¼ c s H. This magnetic model is actualized in some S ¼ 1=2 AFHC systems such as (H 2 O) 2 (PM = pyrimidine). 15,16) The staggered field originates from the alternating g-tensor and the antisymmetric interaction of the Dzyaloshinsky-Moriya (DM) type with the alternating D vector. In these compounds, the fieldinduced gap ÁðHÞ almost proportional to H 2=3 was commonly observed. This field dependence of the gap cannot be explained by the linear spin wave theory, which derives ÁðHÞ / H 1=2 . Using the field theoretical approach, Oshikawa and Affleck 9,10) argued that the model (1) can be mapped onto the quantum sine-Gordon (SG) model with Lagrangian density L ¼ ð1=2Þð@ Þ þ hC cosð2R Þ, where is a canonical Bose field, is the dual field, R is the compactification radius and C is a coupling constant, and that the gap is expressed as ÁðhÞ ' 1:85Jðg B h=JÞ 2=3 lnðJ=g B hÞ 1=6 . Their result is in agreement with experimental results. [11][12][13][14][15][16] In the above-mentioned compounds, the exchange interaction is order of 10 K and the proportional coefficient is rather small, c s ¼ 0:08.13,16) For the comprehensive understanding of the systems described by the model (1), new compounds having different interaction constants are necessary. In this letter, we show that the static and d...

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Struktur‐ und magnetochemische Untersuchungen an KCuGaF₆

Cited by 16 publications

References 38 publications

Syntheses and Crystal Structures of [H₃O]⁺/M²⁺ (M = Fe, Zn, Cu, Hg) Salts with [AsF₆]^–

Syntheses and Crystal Structures of [H₃O]⁺/M²⁺ (M = Fe, Zn, Cu, Hg) Salts with [AsF₆]^–

Zur Kristallstruktur von Pyrochloren: Mössbauer‐Spektrum von orthorhombischem CsFe₂F₆ und röntgenographische Einkristall‐Untersuchungen an den kubischen Verbindungen CsMgGaF₆, CsM^IIV^IIIF₆ (M^II = Mn, Zn), CsM^IIFe^IIIF₆ (M^II = Mn, Cu, Zn) und Cs₄Cu₅V₃O₂F₁₉

Thermodynamic Properties and Elementary Excitations in Quantum Sine-Gordon Spin System KCuGaF₆

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Struktur‐ und magnetochemische Untersuchungen an KCuGaF6

Cited by 16 publications

References 38 publications

Syntheses and Crystal Structures of [H3O]+/M2+ (M = Fe, Zn, Cu, Hg) Salts with [AsF6]–

Syntheses and Crystal Structures of [H3O]+/M2+ (M = Fe, Zn, Cu, Hg) Salts with [AsF6]–

Zur Kristallstruktur von Pyrochloren: Mössbauer‐Spektrum von orthorhombischem CsFe2F6 und röntgenographische Einkristall‐Untersuchungen an den kubischen Verbindungen CsMgGaF6, CsMIIVIIIF6 (MII = Mn, Zn), CsMIIFeIIIF6 (MII = Mn, Cu, Zn) und Cs4Cu5V3O2F19

Thermodynamic Properties and Elementary Excitations in Quantum Sine-Gordon Spin System KCuGaF6

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Struktur‐ und magnetochemische Untersuchungen an KCuGaF₆

Syntheses and Crystal Structures of [H₃O]⁺/M²⁺ (M = Fe, Zn, Cu, Hg) Salts with [AsF₆]^–

Syntheses and Crystal Structures of [H₃O]⁺/M²⁺ (M = Fe, Zn, Cu, Hg) Salts with [AsF₆]^–

Zur Kristallstruktur von Pyrochloren: Mössbauer‐Spektrum von orthorhombischem CsFe₂F₆ und röntgenographische Einkristall‐Untersuchungen an den kubischen Verbindungen CsMgGaF₆, CsM^IIV^IIIF₆ (M^II = Mn, Zn), CsM^IIFe^IIIF₆ (M^II = Mn, Cu, Zn) und Cs₄Cu₅V₃O₂F₁₉

Thermodynamic Properties and Elementary Excitations in Quantum Sine-Gordon Spin System KCuGaF₆