Determination of the spin-Peierls distortion in N-methyl-N-ethyl-morpholinium ditetracyanoquinodimethanide [MEM<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mn /><mml:mo>(</mml:mo><mml:mi mathvariant="normal">TCNQ</mml:mi><mml:mo>)</mml:mo><mml:mn /></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>]: Neutron diffraction study at 6 K

Visser, R. J. J.; Oostra, S.; Vettier, C.; Voiron, J.

doi:10.1103/physrevb.28.2074

Cited by 52 publications

(26 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 4k F phase in the anionic 1:2 CTS is commonly bond dimerized. The most well known example is MEM͑TCNQ͒ 2 , which undergoes a metal-insulator transition accompanied with bond dimerization at 335 K. 41 Site charges are uniform in this 4k F phase. The 2k F phase in the TCNQ-based systems is universally SP and not AFM.…”

Section: Review Of Experimental Resultsmentioning

confidence: 99%

Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

2007

View full text Add to dashboard Cite

Clay, R. T.; Hardikar, Rahul; and Mazumdar, S., "Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band" Physical Review B / (2007) It is known that within the interacting electron model Hamiltonian for the one-dimensional 1 4 -filled band, the singlet ground state is a Wigner crystal only if the nearest-neighbor electron-electron repulsion is larger than a critical value. We show that this critical nearest-neighbor Coulomb interaction is different for each spin subspace, with the critical value decreasing with increasing spin. As a consequence, with the lowering of temperature, there can occur a transition from a Wigner crystal charge-ordered state to a spin-Peierls state that is a bond-charge-density wave with charge occupancies different from the Wigner crystal. This transition is possible because spin excitations from the spin-Peierls state in the 1 4 -filled band are necessarily accompanied by changes in site charge densities. We apply our theory to the 1 4 -filled band quasi-one-dimensional organic charge-transfer solids, in general, and to 2:1 tetramethyltetrathiafulvalene ͑TMTTF͒ and tetramethyltetraselenafulvalene cationic salts, in particular. We believe that many recent experiments strongly indicate the Wigner crystal to bond-charge-density Wave transition in several members of the TMTTF family. We explain the occurrence of two different antiferromagnetic phases but a single spin-Peierls state in the generic phase diagram for the 2:1 cationic solids. The antiferromagnetic phases can have either the Wigner crystal or the bond-charge-spin-density wave charge occupancies. The spin-Peierls state is always a bond-charge-density wave.

show abstract

Section: Review Of Experimental Resultsmentioning

confidence: 99%

Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

2007

View full text Add to dashboard Cite

show abstract

“…One expects as a result of the stoichiometry that each TCNQ will acquire a 92 electric charge and crystallize in one dimensional arrays of TCNQ-1 ions separated by the donor, as occcurs in the well studied TEA (triethylamine) (6) and MEM (methylethylmorpholinium) TCNQ2 systems (7,8). In the limit of weak electronic correlations (U + 0, where U is the on-site electronic repulsion in the Hubbard model (9)), such systems have filled electronic bands and are expected to undergo an electronic instability, called the electronic Peierls transition leading to a phase transition between a metallic and a semiconducting state.…”

Section: Introductionmentioning

confidence: 99%

Phase transitions in the organic semiconductor dipropylamine tetracyanoquinodimethane: DPA TCNQ₂

Bandrauk¹,

Truong²,

Aubin³

1988

Can. J. Chem.

View full text Add to dashboard Cite

. Can. J. Chem. 66,938 (1988). Dipropylarnine tetracyanoquinodirnethane, DPA TCNQ2, is by stoichiometry a 1:2 organic salt giving rise to a f filled band quasi one dimensional electronic system. Conductivity measurements indicate the presence of at least three phase transitions. A dominant transition at 215 K shows simultaneous large discontinuities in both electric and magnetic properties. Infrared measurements suggest a structural change at 21 5 K related to conduction electron-molecular vibration interactions in view of the + appearance of A, TCNQ modes in the infrared spectrum. Deuteration of the donor N-H bond lowers the main transition temperature by 5 K but maintains the same physical properties as in the nondeuterated compound. Le dipropylarnine tCtracyanoquinodirnCthane (DPA TCNQ2) est un sel organique de stoechiomttrie 1:2 qui donne lieu a un systkme tlectronique quasi-unidimensionnel comportant une bande qui n'est remplie qu'au a. Des rnesures de conductivitC suggkrent la prisence d'au rnoins trois transitions de phases. Une transition dorninante a 215 K prtsente des discontinuitCs sirnultanCes irnportantes tant dans les propriCtCs Clectriques que magnktiques. Des mesures infrarouges perrnettent de voir apparaitre les modes A, du TCNQ et suggkrent qu'il se produit un changement de structure a 215 qui est reliC i d e s interactions de vibration de conduction Clectron-rnolCcule. La deutCration de la liaison donneur N-H diminue par 5 K la temperature d'apparition de la transition principale; toutefois, on retrouve les mernes propriCtCs physiques que celles du produit non-deutCrC.[Traduit par la revue]

show abstract

“…The repetitive unit can be presented as 21 1'2' with long 2-2' distance (3.42 A), short 1-2 distance (3.29 A), and intermediate 1-1' distances (3.37 A). Such structure is typical of spin-Peierls systems (24,25). The charge on each TCNQ is estimated to be close to 0.5 e. The total charge distribution per unit cell is 2TCNQ-'I2, ~T E D A~+ , 13-, and 21-, giving a net zero charge.…”

Section: Discussion (A) Crystal Structurementioning

confidence: 96%

“…In the present ternary compound we would seem to have both mechanisms operating, since it is clear that Peierls distortions and electrostatic (crystal) effects cannot be separated. In fact conductivity measurements were extended to high temperatures (400 K) to see if the reverse spin-Peierls transition (dimerization e= tetramerization) could be observed, as in MEM.TCNQ2 (24,25). No change in conductivity or ESR spectrum was observed.…”

Section: Discussion (A) Crystal Structurementioning

confidence: 99%

Properties of a new one-dimensional semiconducting ternary compound: TEDA (triethylenediamine)•I_2.5•TCNQ

Bandrauk¹,

Truong²,

Carlone³

1989

Can. J. Chem.

View full text Add to dashboard Cite

Can. J. Chem. 67,619 (1989). A new semiconducting ternary compound of stoichiometry TEDA.12.5.TCNQ is reported. The crystal is made up of linear chains of TCNQ-"2, nonlinear chains of 13-, and monodides of doubly charged triethylenediamines (TEDA). Half the TEDA's are hydrogen bonded to the TCNQ's and 13-. The conductivity measurements indicate semiconducting behaviour with two discontinuities in activation energy, one at high (330 K) and the other at low (1 60 K) temperatures. Resonance Raman spectra of the crystals manifest strong resonance enhancement of the iodide moieties. In particular, selective resonance excitation at 647 nrn of nonsymmetric 13-is observed, thus indicating an increasing asymmetry of the 13-in the low temperature phase and suggesting coupling between the three species in this phase.

show abstract

Determination of the spin-Peierls distortion in N-methyl-N-ethyl-morpholinium ditetracyanoquinodimethanide [MEM(TCNQ)2]: Neutron diffraction study at 6 K

Cited by 52 publications

References 11 publications

Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

Phase transitions in the organic semiconductor dipropylamine tetracyanoquinodimethane: DPA TCNQ₂

Properties of a new one-dimensional semiconducting ternary compound: TEDA (triethylenediamine)•I_2.5•TCNQ

Contact Info

Product

Resources

About

Determination of the spin-Peierls distortion in N-methyl-N-ethyl-morpholinium ditetracyanoquinodimethanide [MEM(TCNQ)2]: Neutron diffraction study at 6 K

Cited by 52 publications

References 11 publications

Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

Temperature-driven transition from the Wigner crystal to the bond-charge-density wave in the quasi-one-dimensional quarter-filled band

Phase transitions in the organic semiconductor dipropylamine tetracyanoquinodimethane: DPA TCNQ2

Properties of a new one-dimensional semiconducting ternary compound: TEDA (triethylenediamine)•I2.5•TCNQ

Contact Info

Product

Resources

About

Phase transitions in the organic semiconductor dipropylamine tetracyanoquinodimethane: DPA TCNQ₂

Properties of a new one-dimensional semiconducting ternary compound: TEDA (triethylenediamine)•I_2.5•TCNQ