scholarly journals 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

2017 ◽  
Author(s):  
Jean-Paul Pouget ◽  
Pascale Foury-Leylekian ◽  
Manuel Almeida
Keyword(s):  
Magnetic Properties ◽  
Density Wave ◽  
Organic Conductors ◽  
Kondo Lattice ◽  
Adiabatic Limit ◽  
Fine Tuning ◽  
Experimental Realization ◽  
One Dimensional ◽  
Peierls Transition ◽  
A Charge

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 1st neighbour direct and 2nd 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.

Symmetry Violations in Partially Oxidized One-Dimensional (1D)Transition Metal Polymers. Metal-Ligand-Metal(M-L-M) Bridged Systems

1984 ◽  
Vol 39 (9) ◽  
pp. 807-829
Author(s):  
Michael C. Böhm
Keyword(s):  
Transition Metal ◽  
Density Wave ◽  
Tight Binding ◽  
Mean Field ◽  
Valence Bond ◽  
Hole State ◽  
One Dimensional ◽  
Metal Derivatives ◽  
A Charge ◽  
Metal Ligand

The band structure of the metal-ligand-metal (M-L-M) bridged quasi one-dimensional (1D) cyclopentadienylmanganese polymer, MnCp 1, has been studied in the unoxidized state and in a partly oxidized modification with one electron removed from each second MnCp fragment. The tight-binding approach is based on a semiempirical self-consistent-field (SCF) Hartree-Fock (HF) crystal orbital (CO) model of the INDO-type (intermediate neglect of differential overlap) combined with a statistical averaging procedure which has its origin in the grand canonical ensemble. The latter approximation allows for an efficient investigation of violations of the translation symmetries in the oxidized 1D material. The oxidation process in 1 is both ligand- and metal-centered (Mn 3d-2 states). The mean-field minimum corresponds to a charge density wave (CDW) solution with inequivalent Mn sites within the employed repeat-units. The symmetry adapted solution with electronically identical 3d centers is a maximum in the variational space. The coupling of this electronic instability to geometrical deformations is also analyzed. The ligand amplitudes encountered in the hole-state wave function prevent extremely large charge separations between the 3d centers which are found in ID systems without bridging moieties (e.g. Ni(CN)2-5 chain). The symmetry reduction in oxidized 1 is compared with violations of spatial symmetries in finite transition metal derivatives and simple solids. The stabilization of the valence bond-type (VB) solution is physically rationalized (i.e. left-right correlations between the 3d centers). The computational results derived for 1 are generalized to oxidized transition metal chains with band occupancies that are simple fractions of the number of stacking units and to 1D systems that deviate from this relation. The entropy-influence for temperatures T ≠ 0 is shortly discussed (stabilization of domain or cluster structures).

Synthesis, Structure and Magnetic Properties of Monoclinic Nb12O29

2000 ◽  
Vol 658 ◽  
Author(s):  
J. E. L. Waldron ◽  
M. A. Green
Keyword(s):  
Magnetic Properties ◽  
Magnetic Order ◽  
Bulk Sample ◽  
Charge Ordering ◽  
Rapid Reduction ◽  
One Dimensional ◽  
Range Magnetic Order ◽  
A Charge ◽  
Ordering Transition ◽  
Long Range Magnetic Order

ABSTRACTThe synthesis, structure and magnetic properties of monoclinic Nb12O29 are described. The synthesis of a pure bulk sample is difficult due to the large number of other similar phases. It is achieved by rapid reduction of H-Nb2O5 with Nb metal. The compound is shown to undergo a charge ordering transition at low temperature which provokes long range magnetic order in an intriguing one dimensional arrangement.

X-ray diffuse scattering as precursor of incommensurate Peierls transitions in one-dimensional organic charge transfer conductors

2004 ◽  
Vol 219 (11) ◽  
Author(s):  
Jean-Paul Pouget
Keyword(s):  
Charge Transfer ◽  
Charge Density Wave ◽  
Diffuse Scattering ◽  
Lattice Distortion ◽  
Density Wave ◽  
Periodic Lattice ◽  
One Dimensional ◽  
X Ray ◽  
Charge Transfer Salts ◽  
A Charge

AbstractQuasi-one dimensional (1D) conductors of the TTF-TCNQ family of charge transfer salts exhibit a Peierls transition which stabilizes a periodic lattice distortion (PLD), accompanied by a charge density wave (CDW) modulation, with an incommensurate 2

Spin Density Wave in Quasi-One-Dimensional Organic Conductors

2001 ◽  
Vol 223 (2) ◽  
pp. 449-458 ◽  
Author(s):  
K. Nomura ◽  
N. Matsunaga ◽  
A. Ishikawa ◽  
H. Kotani ◽  
K. Yamashita ◽  
...  
Keyword(s):  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Organic Conductors ◽  
One Dimensional

Peculiarities of carrier scattering at the boundary of a normal metal and a quasi-one-dimensional conductor with a charge-density wave

JETP Letters ◽  
1996 ◽  
Vol 64 (4) ◽  
pp. 285-291 ◽  
Author(s):  
A. A. Sinchenko ◽  
Yu. I. Latyshev ◽  
S. G. Zybtsev ◽  
I. G. Gorlova ◽  
P. Monceau
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Normal Metal ◽  
One Dimensional ◽  
Carrier Scattering ◽  
A Charge

Defects in Quasi-One Dimensional Oxide Conductors: K0.3MoO3

1994 ◽  
Vol 375 ◽  
Author(s):  
Kevin E. Smith ◽  
Klaus Breuer ◽  
David Goldberg ◽  
Martha Greenblatt ◽  
William McCarroll ◽  
...  
Keyword(s):  
Electronic Structure ◽  
High Resolution ◽  
Ground State ◽  
Charge Density Wave ◽  
Density Wave ◽  
Luttinger Liquid ◽  
Photoemission Spectroscopy ◽  
One Dimensional ◽  
Low Emission ◽  
Peierls Transition

AbstractThe electronic structure of the prototypical quasi-one dimensional (1D) conductor K03MoO3 has been studied using high resolution photoemission spectroscopy. In particular, the electronic structure of defects was investigated in order to understand the mechanism for charge density wave pinning and destruction of the Peierls transition. Defects were found to radically alter the electronic structure close to the Fermi level (EF), thus strongly modifying the structure of the Fermi surface. While a low emission intensity at EF has been interpreted as evidence for a Luttinger liquid ground state in a ID metal, we show that non-stoichiometric surfaces lead to similar effects. The nature of the ground state is discussed in the context of these results.

Sign in / Sign up

Export Citation Format

Share Document