Electrical conductivity and X-ray diffuse scattering study of the family of organic conductors (perylene)2M(mnt)2, (M=Pt, Pd, Au)

Henriques, R.T.; Alcácer, Luís; Pouget, Jean‐Paul; Jérôme, D.

doi:10.1088/0022-3719/17/29/019

Cited by 72 publications

(68 citation statements)

References 26 publications

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“…Such diffuse lines have been observed in the Pt ([9] -see also figure 5a), Ni [21] and Pd [9] derivatives. The reduced critical wave vector of the fluctuations qSP=b*/2 corresponds to an incipient instability towards a dimerization of the dithiolate stack.…”

Section: A-spin-peierls Structural Fluctuationsmentioning

confidence: 67%

“…This dimerization should lead to a pairing of neighbouring S=1/2 spins into a singlet. The SP structural fluctuation can be quantitatively analyzed from the thermal dependence of the intensity and profile of the diffuse lines along the chain direction b [9], namely:…”

Section: A-spin-peierls Structural Fluctuationsmentioning

confidence: 99%

“…Sharp b*/2 SP superstructure reflections are observed below TSP=28K in the Pd salt [9]. "TSP" is a pseudo SP transition temperature for the Ni salt since the low temperature saturation of χSP(qSP)…”

Section: B-spin-peierls and Peierls Ordersmentioning

confidence: 99%

“…Among them 2:1 D2X salts were found to exhibits quasi-1D metals exhibiting a 2kF BOW/CDW instability diverging into a Peierls metal-insulator transition (see section II). A very original physics is observed in Per-dithiolate salts α-(Per)2[M(mnt)2] which for some specific dithiolate acceptors mix 1D conducting and magnetic properties [7,8] at RT) [9] with a quarter-filled hole (or a three quarter filled electron) conduction band -see figure 3a. With M=Au and Cu close shell dithiolate molecules and with M=Fe and Co dithiolate molecules forming stacks of dimers, only the Per stack is electro-active.…”

Section: Introductionmentioning

confidence: 99%

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Peierls and Spin-Peierls Instabilities in the Per2[M(mnt)2] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

Pouget¹,

Foury-Leylekian²,

Almeida³

2017

Preprint

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We summarize structural instabilities exhibited by the one dimensional (1D) (arene)2X family of organic conductors in relation with their electronic and magnetic properties. With a charge transfer of one electron to each anion X these salts exhibit a quarter-filled (hole) conduction band located on the donor stacks. Compounds built with donors such as fluorenthene and perylene derivatives and anions X such PF6 or AsF6 exhibit a high temperature (TP~170K) conventional Peierls transition which is announced by a sizeable regime of 1D 2kF charge density wave fluctuations (kF is the Fermi wave vector of the 1D electron gas located on Per stacks). Surprisingly, and probably because of the presence of a multi-sheet warped Fermi surface, the Peierls transition is considerably reduced in the perylene series α-(Per)2[M(mnt)2] where X is the dithiolate molecule with M=Au, Cu, Co and Fe. A special attention is devoted in this paper to physical properties of α-(Per)2[M(mnt)2] salts which with M=Pt, Pd and Ni incorporate segregated S=1/2 1D antiferromagnetic (AF) dithiolate stacks with 1D metallic Per stacks. We analyse conjointly the structural and magnetic properties of these salts in relation with the 1D spin-Peierls (SP) instability located on the dithiolate stacks. We show that the SP instability of the Pd and Ni derivatives occurs in the classical (adiabatic limit) while the SP instability of the Pt derivative occurs in the quantum (anti-adiabatic limit). Furthermore we show that in the Pd and Ni derivatives frustrated 1 st neighbour direct and 2 nd neighbour indirect (through a fine tuning with the mediated 2kF RKKY coupling interaction on Per stacks) AF interactions add their contribution to the SP instability to open a singlet-triplet gap. Our analysis of the data show unambiguously that magnetic α-(Per)2[M(mnt)2] salts are a typical realization of the physics predicted for two chain 1D Kondo lattices.

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Section: A-spin-peierls Structural Fluctuationsmentioning

confidence: 67%

Section: A-spin-peierls Structural Fluctuationsmentioning

confidence: 99%

Section: B-spin-peierls and Peierls Ordersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Peierls and Spin-Peierls Instabilities in the Per2[M(mnt)2] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

Pouget¹,

Foury-Leylekian²,

Almeida³

2017

Preprint

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“…Spatial correlations are derivable from the widths in reciprocal space of diffuse peaks, the peaks in some cases becoming superlattice Bragg reflections as the temperature T drops to ~ and below (see e.g. Henriques et al 1984). For the case of neutron scattering, energy analysis of the inelastic intensity allows time-dependent correlations of the system to be observed in frequency space.…”

Section: Introductionmentioning

confidence: 99%

Correlations in Space and Time for a Soft-mode Phase-transforming System

Mair

1987

Aust. J. Phys.

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Aust. J. Phys., 1987,40, 619-34 Using molecular dynamics (MD) for a system of.nonlinear (quadruple-quadratic) oscillators on a nearest-neighbour square lattice, the pair-displacement correlations. and the frequency spectrum for the dynamical order-parameter correlation function are obtained as a function of temperature. For temperatures T near T c ' the pair-displacement correlation function (with the long-range order component subtracted out) was found to vary with particle separation r as r-1/2 exp { -A( T) rj, at least out to the tenth neighbour in the 40x40 particle lattice. This is consistent with predictions for the two-dimensional Ising model for T above, but not below, Tc. The frequency spectrum for the dynamical order-parameter correlation function shows the softening of the damped phonon-like modes as T approaches Tc and the formation of a central peak at Tc' consistent with the presence of soliton-like excitations. For small I T -Tc I an additional broad peak appears at low frequencies. This is interpreted as an additional phonon-like peak, the two quasi-phonon processes being associated with vibration across the potential barrier and vibration in one or other of the two potential wells respectively. Although the squared frequency wi of the soft quasi-phonon is approximately linear with I T -Tc lover a range of temperatures, as T increases the wi curve eventually flattens out.

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Multiproperty Molecular Materials: TTF‐Based Conducting and Magnetic Molecular Materials

2004

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The chemistry and physics of molecule‐based materials are exciting subjects, and due to potential applications this area is being extensively investigated. Considerable effort is currently being made to design and to investigate new materials involving interplay or synergy between multiple physical properties. This microreview examines materials combining magnetism and electrical properties. Some fundamental background material is covered, together with a discussion of constraints on the design of molecular materials with these physical properties. Some examples from the literature are then related, in order to illustrate the achievements in this area. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)

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Electrical conductivity and X-ray diffuse scattering study of the family of organic conductors (perylene)₂M(mnt)₂, (M=Pt, Pd, Au)

Cited by 72 publications

References 26 publications

Peierls and Spin-Peierls Instabilities in the Per<sub>2</sub>[M(mnt)<sub>2</sub>] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

Peierls and Spin-Peierls Instabilities in the Per<sub>2</sub>[M(mnt)<sub>2</sub>] Series of One-Dimensional Organic Conductors; Experimental Realization of a 1D Kondo Lattice for M = Pd, Ni and Pt

Correlations in Space and Time for a Soft-mode Phase-transforming System

Multiproperty Molecular Materials: TTF‐Based Conducting and Magnetic Molecular Materials

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