Interlayer Charge Disproportionation in the Layered Organic SuperconductorκH−(DMEDO−TSeF)2[Au

Abstract

We report the molecular dipole effect on conduction electrons in the title superconductor. The angular-dependent magnetoresistance has a peak for fields nearly parallel to the conducting layer, and the peak width scales as the field component perpendicular to the layer, indicating incoherent interlayer transport. However, two closed Fermi surfaces are observed in quantum oscillation. Accordingly, crystallographically independent layers have different charge densities in a bulk single crystal. The electric dipole of tetrahydrofuran gives rise to interlayer charge disproportionation.

Valley-Polarized Interlayer Conduction of Anisotropic Dirac Fermions inSrMnBi2

“…The width of the 90°peak, estimated from the derivatives of ρ c ðθÞ, is independent of the field strength up to 35 T [18]. This confirms that the 90°peak is the coherent peak, which is attributed to the effect of either the closed orbits [23][24][25] or the self-crossing orbits [26] formed on the side of the corrugated quasi-2D FS. These results clearly show that the coherent conduction in the quasi-2D α FSs contributes significantly to the c-axis conduction in SrMnBi 2 .…”

Quantum oscillations and coherent interlayer transport in a new topological Dirac semimetal candidate YbMnSb2

“…For the incoherent interlayer transport, FS is only defined within the plane of layers since the scattering rate in the layer is much larger than the interlayer hopping integral [58]. The interlayer conductivity is proportional to the tunneling rate between layers [56,59]. However, in the case of coherent interlayer transport, the interlayer conductivity is determined by the carriers scattering rate and the electronic group velocity perpendicular to the layers [56,57].…”

Inter-layer charge disproportionation in the dual-layer organic metal (tTTF-I)2ClO4with unsymmetrical I⋯O halogen bond interactions

“…This striking charge-transfer possibility should be actually potentially observed in every dual-layer systems mentioned above, [35][36][37][38][39][40][41][42][43][44][45][46] provided that charge is delocalized in both layers. This has been indeed suggested and/or calculated in (TMET-STF) 2 BF 4 , 41b with a proposed +0.40/+0.60e charge distribution, in β-β-(BEDT-TTF) 2 [CH(SO 2 CF 3 ) 2 ], with +0.56/+0.42e distribution between the two different β layers, 37 An opposite situation is found for example in the two isomorphous α-(N-Me-3,5-diiodopyridinium)[Ni(dmit) 2 ] 2 and (N-Me-3-bromo-5-iodopyridinium)[Ni(dmit) 2 ] 2 salts, 46 where one observes an alternation of Mott insulating (Layer I) and 2D conducting (Layer II) layers.…”

“…Such a dual-layer situation has been encountered only in a few cases, either in BEDT-TTF salts such as (BEDT-TTF) 2 -PtCl 6 (PhCN), 35 α-κ-(BEDT-TTF) 2 [Hg(SCN) 3 ], 36 39 or in other donor salts such as (EDO-TTF) 2 X (EDO-TTF = ethylenedioxotetrathiafulvalene, X = GaCl 4 and ReO 4 ), 40 (TMET-STF) 2 X (TMET-STF = trimethylene(ethylenedithio)diselenadithiafulvalene; X = ClO 4 and BF 4 ), 41 or κ H -(DMEDOTSeF) 2 [Au(CN) 4 ]•THF where DME-DOTSeF is dimethyl(ethylenedioxy)-tetraselenafulvalene. 42 In many instances, the presence of two crystallographically independent molecules, which then further segregate into crystallographically independent slabs, can be attributed to an asymmetry in the anion layer, eventually enhanced by directional intermolecular interactions at the interface. For example, as shown in Scheme 2a-b, a hydrogen bond interaction of a TTF primary amide derivative with the tetrahedral ReO 4…”