New aspects of π–d interactions in magnetic molecular conductors

Sugimoto, Toyonari; Fujiwara, Hideki; Noguchi, S.; Murata, Keizo

doi:10.1088/1468-6996/10/2/024302

Cited by 19 publications

(12 citation statements)

References 35 publications

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“…In order to investigate the possible influence of magnetic moments on the ground states of molecular conductors and try to manipulate both spin and charge degrees of freedom simultaneously, a number of π -d hybrid magnetic conductors have been developed and examined. [1][2][3][4] For example, the magnetic-field-induced superconductivity was discovered in the layered conductor λ-(BETS) 2 FeCl 4 , 5 and the highly onedimensional semiconductor based on phthalocyanine showed giant negative magnetoresistance (MR), 6 representing significant π -d interaction.…”

Section: Introductionmentioning

confidence: 99%

Anomalous magnetoresistance and hidden spin canting in (DIETSe)2MCl4(M=Fe<

et al. 2013

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The quasi-one-dimensional (Q1D) molecular conductors (DIETSe) 2 MCl 4 [M = Fe, Ga] undergo a spin density wave (SDW) transition below 12 K. The SDW ground state is suppressed by applying high pressure, recovering the Q1D Fermi surface which is confirmed by the appearance of Lebed resonance in the angle-dependent magnetoresistance (MR). Above the critical pressure of SDW, MR shows kink structures at high magnetic fields, reminiscent of field-induced spin density wave (FISDW) transition in both salts. The π-d hybrid (DIETSe) 2 FeCl 4 also exhibits an antiferromagnetic (AF) transition of d-electron spins at 2.5 K, below which the spin-flop-induced positive large MR are observed. The change in the interlayer MR reaches 130% at 10.5 kbar. The resistance anomalies associated with spin flop are also observed in the angle-dependent MR at low magnetic fields below 5 T, associated with clear hysteresis. A polar plot of these anomalies reveals the presence of hidden spin canting. Two magnetic easy axes of d-electron spins are found to be tilted ±16 degrees from the b axis towards the c axis. The interplay between the SDW instability of Q1D π electrons and the local moments of AF d-electron spins is considered as the origin of the anomalous transport behaviors.

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Section: Introductionmentioning

confidence: 99%

Anomalous magnetoresistance and hidden spin canting in (DIETSe)2MCl4(M=Fe<

et al. 2013

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“…Ea decreased gradually with an increase in the pressure. This decrease in Ea indicates an enhancement in the conduction band [32], which is attributed to isostatic compression of the BEDT molecule and an increase in the overlap of the molecular orbitals. Another possibility is a structural re-arrangement of the molecule, especially a change in the dihedral angle between neighbouring molecules which causes an overlap in the orbitals, which reduces Ea [33].…”

Section: Electrical Conductivitymentioning

confidence: 98%

Hybrid Molecular Compound Exhibiting Slow Magnetic Relaxation and Electrical Conductivity

et al. 2016

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Electrochemical oxidation of a solution containing KDy(hfac) 4 (hfac, hexafluoroacetyacetone) and Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) afforded a hybrid material formulated as [β -(BEDT-TTF) 2 Dy(CF 3 COO) 4 ·MeCN] n . The complex crystallizes in the triclinic space group P1. The before mentioned complex has a chain structure containing 4f ions bridged by mono-anion CF 3 COO − ligand, and acts as single-molecule magnet (SMM) at low temperature. The conducting layer was composed of partially oxidized BEDT-TTF molecules in β type arrangement. The presence of radical cation and its charge ordering was assigned on the basis of optical spectra. Electrical resistivity measurements revealed semiconducting behaviour (conductivity at room temperature of 1.1 × 10 −3 S·cm −1 , activation energy of 158.5 meV) at ambient pressure.

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“…Interaction between these two systems may lead to magnetically ordered conducting structures. The problem of magnetic order and electrical conductivity coexistence is highly topical [5,8,12,13]. Magnetic interactions in these compounds are basically explained by the RKKY-type interaction mediated by the π-d coupling between the donor and the magnetic anions [14].…”

Section: Introductionmentioning

confidence: 99%

Vibrational and Electronic Structure, Electron-Electron and Electron-Phonon Interactions in Organic Conductors Investigated by Optical Spectroscopy

Łapiński¹

2016

Applications of Molecular Spectroscopy to Current Research in the Chemical and Biological Sciences

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The physical properties of organic conductors formed by tetrathiafulvalene (TTF) derivatives have been discussed in this chapter. The results were obtained using spectroscopic methods including infrared (IR), Raman, and UV-Vis. The experimental data were supported by theoretical DFT and TD-DFT calculations. Special attention has been paid to the description of electronic and vibrational structures, electron-electron and electron-phonon interactions and determination of transport parameters.

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New aspects of π–d interactions in magnetic molecular conductors

Cited by 19 publications

References 35 publications

Anomalous magnetoresistance and hidden spin canting in (DIETSe)2MCl4(M=Fe<

Anomalous magnetoresistance and hidden spin canting in (DIETSe)2MCl4(M=Fe<

Hybrid Molecular Compound Exhibiting Slow Magnetic Relaxation and Electrical Conductivity

Vibrational and Electronic Structure, Electron-Electron and Electron-Phonon Interactions in Organic Conductors Investigated by Optical Spectroscopy

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