Charge ordering and antiferromagnetism in (TMTTF)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>SbF<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>6</mml:mn></mml:msub></mml:math>

Matsunaga, N.; Hirose, Shinji; Shimohara, N.; Satoh, T.; Isome, Tomoyuki; Yamomoto, Masatoshi; Liu, Yang; Kawamoto, Atsushi; Nomura, K.

doi:10.1103/physrevb.87.144415

Cited by 17 publications

(25 citation statements)

References 21 publications

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“…One-sided 13 C-enriched TMTTF [ Fig. 1(b)] was synthesized by coupling the dibutyltin complexes and was prepared as described.…”

Section: Methodsmentioning

confidence: 99%

“…1(b)] was synthesized by coupling the dibutyltin complexes and was prepared as described. 18,19 The advantages of this method include the availability of 13 C-dichloroacetic acid methyl ester and the establishment of the precursors of butyltin and ester complexes. 18,20 One-sided 13 C-enriched TMTTF eliminates spectral splitting by Pake doublets and enables easy analysis of NMR spectra.…”

Section: Methodsmentioning

confidence: 99%

“…13 C NMR provides microscopic information about the magnetic state around nuclei. However, conventional 13 C NMR with double-sided 13 C-enriched molecules involves the Pake doublet problem or restriction of the field direction setting. 18 Therefore, we performed 13 C NMR with a one-sided 13 C-enriched molecule to determinate the commensurate antiferromagnetic structure of (TMTTF) 2 Br and to verify the CO state above the antiferromagnetic phase.…”

Section: Introductionmentioning

confidence: 99%

“…12 We suggested a commensurate antiferromagnetic fluctuation in the CO paramagnetic state of (TMTTF) 2 AsF 6 from NMR study. We recently determined the magnetic structure of the antiferromagnetic phase (AF-I) of (TMTTF) 2 SbF 6 , 13 which is on the lower pressure side of (TMTTF) 2 AsF 6 . The antiferromagnetic structure of (TMTTF) 2 SbF 6 could be interpreted as a simple up-down moment, which was different from that expected from the fluctuation of the salt (TMTTF) 2 AsF 6 .…”

Section: Introductionmentioning

confidence: 99%

“…The commensurate antiferromagnetism (AF-II) of (TMTTF) 2 Br, which is separated from AF-I by the nonmagnetic spin Peierls (SP) state, is thought to be important for understanding P-T phase diagrams of (TMTTF) 2 X. 13 C NMR provides microscopic information about the magnetic state around nuclei. However, conventional 13 C NMR with double-sided 13 C-enriched molecules involves the Pake doublet problem or restriction of the field direction setting.…”

Section: Introductionmentioning

confidence: 99%

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13C NMR study of commensurate antiferromagnetism in (TMTTF)2Br

2013

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Quasi-one-dimensional organic conductors (TMTCF) 2 X have various electric and magnetic properties. Although theoretical and experimental studies have suggested that (TMTTF) 2 Br has the properties of commensurate antiferromagnetism, details of the magnetic structure of this compound are unclear. Two types of antiferromagnetism are expected, one due to a localized electron and the other to the nesting of the Fermi surface. We therefore assessed the antiferromagnetic structure of (TMTTF) 2 Br using 13 C NMR. Site assignment of the observed antiferromagnetic spectrum confirmed that there were two magnetic molecular sites, with staggered moments and amplitude of 0.11μ B /molecule, as well as nonmagnetic molecular sites. A commensurate structure with antiferromagnetic ordering of (↑ • ↓ •) along a one-dimensional chain would be expected as the freezing of antiferromagnetic fluctuations in the charge-ordered phase of the (TMTTF) 2 AsF 6 salt. The presence of a nodal site is strongly suggestive of the nesting type antiferromagnetism. The fine structure of the antiferromagnetic spectrum suggests superlattice along the interchain direction. We could not observe line broadening due to the charge order above the antiferromagnetic transition.

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“…One-sided 13 C-enriched TMTTF [ Fig. 1(b)] was synthesized by coupling the dibutyltin complexes and was prepared as described.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

13C NMR study of commensurate antiferromagnetism in (TMTTF)2Br

2013

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Coexistence of charge order and antiferromagnetism in (TMTTF)2SbF6: NMR study

Nomura

Yamamoto

Matsunaga

et al. 2015

Physica B: Condensed Matter

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The electronic state of (TMTTF) 2 SbF 6 was investigated by the 1 H and 13 C NMR measurements. The temperature dependence of T 1 -1 in 1 H NMR shows a sharp peak associated with the antiferromagnetic transition at T AF =6 K. The temperature dependence of T 1 -1 is described by the power law T 2.4 below T AF . This suggests the nodal gapless spin wave excitation in antiferromagnetic phase. In 13 C NMR, two sharp peaks at high temperature region, associated with the inner and the outer carbon sites in TMTTF dimer, split into four peaks below 150 K. It indicates that the charge disproportionation occurs. The degree of charge disproportionation ∆ρ is estimated as (0.25±0.09)e from the chemical shift difference. This value of ∆ρ is consistent with that obtained from the infrared spectroscopy. In the antiferromagnetic state (AFI), the observed line shape is well fitted by eight Lorentzian peaks. This suggests that the charge order with the same degree still remains in the AF state. From the line assignment, the AF staggered spin amplitude is obtained as 0.70µ B and 0.24µ B at the charge rich and the poor sites, respectively. These values corresponding to almost 1µ B per dimer are quite different from 0.11µ B of another AF (AFII) state in (TMTTF) 2 Br with effective higher pressure. As a result, it is understood that the antiferromagnetic staggered spin order is stabilized on the CO state in the AFI phase of (TMTTF) 2 SbF 6 .

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Ferroelectricity in molecular solids: a review of electrodynamic properties

Tomić

Dressel

2015

Rep. Prog. Phys.

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In conventional ferroelectrics the polarization is induced either by the relative displacement of positive and negative ions due to a lattice distortion or by the collective alignment of permanent electric dipoles. Strongly correlated materials with the inversion-symmetry-broken ground states feature electronic ferroelectricity, a phenomenon which has recently caught the attention of condensed matter physicists due to its great fundamental and technological importance. The discovery of electronic ferroelectricity in one and two-dimensional molecular solids is an exciting development because they show a rich variety of nonlinear properties and complex electrodynamics, including nontrivial emergent excitations. We summarize key experimental results, sketch the current theoretical understanding and outline promising prospects of this phenomenon which have great potential for future electronic devices.

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Charge ordering and antiferromagnetism in (TMTTF)2SbF6

Cited by 17 publications

References 21 publications

13C NMR study of commensurate antiferromagnetism in (TMTTF)2Br

13C NMR study of commensurate antiferromagnetism in (TMTTF)2Br

Coexistence of charge order and antiferromagnetism in (TMTTF)2SbF6: NMR study

Ferroelectricity in molecular solids: a review of electrodynamic properties

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