Crystal structure, Fermi surface calculations and Shubnikov-de Haas oscillation spectrum of the organic metal θ-(BETS)4HgBr4(C6H5Cl) at low temperature

Vignolles, David; Audouard, Alain; Lyubovskiǐ, R. B.; Pesotskiǐ, S. I.; Béard, J.; Canadell, Enric; Шилов, Г. В.; Bogdanova, O. Yu.; Zhilayeva, Elena I.; Lyubovskaya, Rimma N.

doi:10.1016/j.solidstatesciences.2007.07.025

Cited by 16 publications

(31 citation statements)

References 30 publications

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“…These facts and the extended phase transition allow one to assume that phase transitions in crystals of (BEDT‐TTF) 4 HgBr 4 (C 6 H 5 X) containing C 6 H 5 X could be due to conformational rearrangements of terminal ethylene groups 39. Moreover, we evidenced that disordered molecules of C 6 H 5 Cl are retained in the structure of (BETS) 4 HgBr 4 (C 6 H 5 Cl) below the transition, hence the phase‐transition temperature is not related to solvent 35…”

Section: Conducting Properties Of (D)4mbr4(c6h6–nxn)mentioning

confidence: 72%

“…For compounds of this family, the phase‐transition widths increase to 5–6 K for the BETS salts33,35,42 and to around 15–20 K for the BEDT‐TTF species 36. The phase‐transition temperatures correlate with the volume of the substituent in the halobenzene.…”

Section: Crystal Structures Of (D)4mbr4(c6h6–nxn)mentioning

confidence: 99%

“…For all the BETS‐based conductors, metallic behavior of the in‐plane resistivity ( R ∥ ) down to around 4.3 K and semiconducting growth of the interlayer resistivity ( R ⟂ ) were observed with decreasing temperature 33,35,39–42. For BETS 4 HgBr 4 (C 6 H 5 Cl), the metallic behavior of R ∥ changed to semiconducting behavior at T = 246 K (Figure 1),33 which at T 2 = 240 K transformed again to metallic behavior.…”

Section: Conducting Properties Of (D)4mbr4(c6h6–nxn)mentioning

confidence: 99%

“…It was shown that the neighboring layers have a different structure below the transition temperature and hence different Fermi surfaces above and below the transition temperature 35. The metallic character of the electron band structure of the layers was proved by the observation of quantum oscillations of magnetoresistance 33,35…”

Section: Synthesis Of Compounds Of the D4(mbr4)(c6h6–nxn) Family mentioning

confidence: 99%

“…In this structure, crystallographically different layers formed by radical cations alternate with the layers formed by [MBr 4 ] 2– anions and monosubstituted halobenzene molecules, similarly to those of the triclinic phases of compounds containing C 6 H 4 Cl 2 . For example, in the structure of (BETS) 4 HgBr 4 (C 6 H 5 Cl) determined at 200 K (phase transition temperature is 246–240 K), there are two independent conducting radical‐cation layers A and B with differently oriented stacks, as in the triclinic phases of compounds containing dichlorobenzene 35. Neighboring radical‐cation layers A and B differ in stack direction, the period along a conducting stack, and the dihedral angle ( θ ) between the radical cations of neighboring stacks.…”

Section: Crystal Structures Of (D)4mbr4(c6h6–nxn)mentioning

confidence: 99%

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Dual‐Layered Quasi‐Two‐Dimensional Organic Conductors with Presumable Incoherent Electron Transport

Lyubovskaya¹,

Zhilyaeva²,

Шилов³

et al. 2014

Eur J Inorg Chem

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We have prepared a series of BEDT‐TTF or BETS‐based radical‐cation salts (D)4MBr4(C6H6–nXn) with tetrahedral anions [MIIBr4]2– (D = BETS, BEDT‐TTF; X = F, Cl, Br; n = 1, 2). The salts (D)4MBr4(C6H6–nXn) are characterized by the different structures of neighboring conducting layers, structural phase transitions, and different types of conductivity, namely, metallic and semiconducting, along and across the conducting layers, respectively. The Fermi surface of the metallic layer of (D)4MBr4(C6H6–nXn) with alternating crystallographically different conducting layers (dual‐layered salts) provides a roadmap for interpreting the transport properties of quasi‐two‐dimensional organic conductors. This review reports on the structures of these compounds, the effect of MBr4 anions and solvent on the occurrence of phase transitions, different Fermi surface topologies in connection with the different structures of neighboring conducting layers, and the possibility of the incoherent transport of charge carriers in such systems.

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Section: Conducting Properties Of (D)4mbr4(c6h6–nxn)mentioning

confidence: 72%

Section: Crystal Structures Of (D)4mbr4(c6h6–nxn)mentioning

confidence: 99%

Section: Conducting Properties Of (D)4mbr4(c6h6–nxn)mentioning

confidence: 99%

Section: Synthesis Of Compounds Of the D4(mbr4)(c6h6–nxn) Family mentioning

confidence: 99%

Section: Crystal Structures Of (D)4mbr4(c6h6–nxn)mentioning

confidence: 99%

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Dual‐Layered Quasi‐Two‐Dimensional Organic Conductors with Presumable Incoherent Electron Transport

Lyubovskaya¹,

Zhilyaeva²,

Шилов³

et al. 2014

Eur J Inorg Chem

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Metallic Bi‐ and Monolayered Radical Cation Salts Based on Bis(ethylenedithio)tetrathiafulvalene (BEDT‐TTF) with the Tris(oxalato)gallate Anion

et al. 2014

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New metallic triclinic (1) and monoclinic (2) crystals of the (BEDT‐TTF)4AI[MIII(C2O4)3]G family of organic molecular conductors have been prepared: α‐“pseudo‐κ”‐(BEDT‐TTF)4Kx(H3O)1–x[GaIII(C2O4)3]·1,2‐C6H4Br2 (x ≈ 0.45) (1) and β″‐(BEDT‐TTF)4Kx(H3O)1–x[GaIII(C2O4)3]·PhBr (x ≈ 0.33) (2). The triclinic crystals belong to a quite rare type of bilayered radical ion salts and contain alternating BEDT‐TTF layers with two distinct packing motifs (α‐ and “pseudo‐κ”). The monoclinic crystals contain one kind of BEDT‐TTF radical cation layers. The crystal structure, transport, and magnetotransport properties of 1 and 2 have been studied. The Shubnikov–de Haas (SdH) oscillations were found in both phases. The structure and properties of 1 and 2 are compared with another similar phase with M = FeIII.

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Molecular conductors with differently oriented conducting layers, (EDT-TTF)3Hg2Br6 and (TMBEDT-TTF)5Hg(SCN)4-xIx

et al. 2010

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New conducting radical cation salts (EDT TTF) 3 Hg 2 Br 6 , (TMET) 5 Hg(SCN) 4-x I x (x ≈ 0.35), and (EDT TTF) 3 Hg(SCN) 3 I 0.5 (PhCl) 0.5 were synthesized. Their conductivities, ESR and polarized reflectance spectra were studied. It was shown that the organic conductors with differently oriented conducting layers (EDT TTF) 3 Hg 2 Br 6 and (TMET) 5 Hg(SCN) 4-x I x (x ≈ 0.35) are characterized by the quasi one dimensional character of electron motion. The conductivity along and across conducting layers has a semiconductive character. It was estab lished by ESR and polarized reflectance spectroscopy that the properties of such conductors are a superposition of the properties of individual conducting layers.Molecular conductors based on radical cation salts are widely investigated in recent decades. On cooling, many of these compounds exhibit metallic properties and un dergo phase transitions into the superconducting or di electric state. 1,2 Their structures and properties strongly depend on counterions that determine the character of the radical cation salts. The mercury containing anions with the halogen, thiocyanate, and mixed type ligands with diverse compositions and structures are used as counter ions. A whole class of low dimensional molecular con ductors based on the radical cation salts with the mercury containing metal complexes as anions has arisen. 3,4The radical cation salts with the thiocyanatomercu rate anions with the composition (ET) x MHg(SCN) 4 (ET is bis(ethylenedithio)tetrathiafulvalene, M is a monovalent cation), depending on the nature of the cation M, are characterized by a wide range of electroconducting properties, from semicon ducting to superconducting ones (see Ref. 4 and refer ences cited therein). The crystals of molecular conductors with the mixed halogenothiocyanatomercurate anions (ET) 2 Hg(SCN) 3-n X n (X = F, Cl, Br, I) undergo the phase transitions of the type metal-insulator upon lowering of temperature. 3 Among the radical cation salts with the halogenomercurate anions, there are superconductors (ET) 4

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Crystal structure, Fermi surface calculations and Shubnikov-de Haas oscillation spectrum of the organic metal θ-(BETS)4HgBr4(C6H5Cl) at low temperature

Cited by 16 publications

References 30 publications

Dual‐Layered Quasi‐Two‐Dimensional Organic Conductors with Presumable Incoherent Electron Transport

Dual‐Layered Quasi‐Two‐Dimensional Organic Conductors with Presumable Incoherent Electron Transport

Metallic Bi‐ and Monolayered Radical Cation Salts Based on Bis(ethylenedithio)tetrathiafulvalene (BEDT‐TTF) with the Tris(oxalato)gallate Anion

Molecular conductors with differently oriented conducting layers, (EDT-TTF)3Hg2Br6 and (TMBEDT-TTF)5Hg(SCN)4-xIx

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Crystal structure, Fermi surface calculations and Shubnikov-de Haas oscillation spectrum of the organic metal θ-(BETS)4HgBr4(C6H5Cl) at low temperature

Cited by 16 publications

References 30 publications

Dual‐Layered Quasi‐Two‐Dimensional Organic Conductors with Presumable Incoherent Electron Transport

Dual‐Layered Quasi‐Two‐Dimensional Organic Conductors with Presumable Incoherent Electron Transport

Metallic Bi‐ and Monolayered Radical Cation Salts Based on Bis(ethylenedithio)­tetrathiafulvalene (BEDT‐TTF) with the Tris(oxalato)gallate Anion

Molecular conductors with differently oriented conducting layers, (EDT-TTF)3Hg2Br6 and (TMBEDT-TTF)5Hg(SCN)4-xIx

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Metallic Bi‐ and Monolayered Radical Cation Salts Based on Bis(ethylenedithio)tetrathiafulvalene (BEDT‐TTF) with the Tris(oxalato)gallate Anion