Variation of Electronic Heat Capacity of κ-(BEDT-TTF)<sub>2</sub>Cu[N(CN)<sub>2</sub>]Br Induced by Partial Substitution of Donor Layers

Emre, Yesil,; Imajo, Shusaku; Nomoto, Tetsuya; Akutsu, Hiroki; Nakazawa, Yasuhiro

doi:10.7566/jpsj.89.073701

Cited by 3 publications

(2 citation statements)

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“…As discussed in Ref. [19], this is more likely due to the impurity scattering at superconducting gap nodes because the present superconductivity is classified into d-wave symmetry with line nodes [30]. For the higher x salts, a small amount of extrinsic contribution arising from some impurities are included, as displayed in Fig.…”

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confidence: 84%

Persistence of fermionic spin excitations through a genuine Mott transition in $κ$-type organics

Imajo,

Kato,

Marckwardt

et al. 2022

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We investigate the continuous variation of electronic states from a Fermi liquid to a quantum spin liquid induced by chemical substitution in the organic dimer-Mott system of κ-[(BEDSe-TTF)x(BEDT-TTF)1−x]2Cu[N(CN)2]Br. Electrical transport measurements reveal that the mixing of BEDSe-TTF into the BEDT-TTF layers induces a quantum Mott transition around x=0.10. Although a charge gap disappears at this point, magnetic susceptibility and heat capacity measurements indicate that fermionic low-energy excitations remain in the insulating salts, suggesting that fermionic spin excitations persist. We propose that the transition can be classified into a genuine Mott transition.

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confidence: 84%

Persistence of fermionic spin excitations through a genuine Mott transition in $κ$-type organics

Imajo,

Kato,

Marckwardt

et al. 2022

Preprint

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“…Physical pressure, on the other hand, enables tuning in arbitrary steps through the phase diagram, at the cost of more difficult experiments that have to be carried out in a pressure cell. The advantages of both approaches-flexible tuning and ambient pressure experiments-can be achieved by partial substitution of the constituents, either the donor molecules [16][17][18][19][20][21][22][23][24][25][26][27][28][29] or the anions [30][31][32][33], as depicted in Figure 1. So far, partial substitution has remained poorly investigated compared to pressure tuning, but, in addition to bandwidth tuning, it also enables the study of disorder effects on metal-insulator transitions and superconductivity [29].…”

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Tuning Charge Order in (TMTTF)2X by Partial Anion Substitution

et al. 2021

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In the quasi-one-dimensional (TMTTF)2X compounds with effectively quarter-filled bands, electronic charge order is stabilized from the delicate interplay of Coulomb repulsion and electronic bandwidth. The correlation strength is commonly tuned by physical pressure or chemical substitution with stoichiometric ratios of anions and cations. Here, we investigate the charge-ordered state through partial substitution of the anions in (TMTTF)2[AsF6]1−x[SbF6]x with x≈0.3, determined from the intensity of infrared vibrations, which is sufficient to suppress the spin-Peierls state. Our dc transport experiments reveal a transition temperature TCO = 120 K and charge gap ΔCO=430 K between the values of the two parent compounds (TMTTF)2AsF6 and (TMTTF)2SbF6. Upon plotting the two parameters for different (TMTTF)2X, we find a universal relationship between TCO and ΔCO yielding that the energy gap vanishes for transition temperatures TCO≤60 K. While these quantities indicate that the macroscopic correlation strength is continuously tuned, our vibrational spectroscopy results probing the local charge disproportionation suggest that 2δ is modulated on a microscopic level.

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Persistence of fermionic spin excitations through a genuine Mott transition in κ -type organics

et al. 2022

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Variation of Electronic Heat Capacity of κ-(BEDT-TTF)₂Cu[N(CN)₂]Br Induced by Partial Substitution of Donor Layers

Cited by 3 publications

References 37 publications

Persistence of fermionic spin excitations through a genuine Mott transition in $κ$-type organics

Persistence of fermionic spin excitations through a genuine Mott transition in $κ$-type organics

Tuning Charge Order in (TMTTF)2X by Partial Anion Substitution

Persistence of fermionic spin excitations through a genuine Mott transition in κ -type organics

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Variation of Electronic Heat Capacity of κ-(BEDT-TTF)2Cu[N(CN)2]Br Induced by Partial Substitution of Donor Layers

Cited by 3 publications

References 37 publications

Persistence of fermionic spin excitations through a genuine Mott transition in $κ$-type organics

Persistence of fermionic spin excitations through a genuine Mott transition in $κ$-type organics

Tuning Charge Order in (TMTTF)2X by Partial Anion Substitution

Persistence of fermionic spin excitations through a genuine Mott transition in κ -type organics

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Variation of Electronic Heat Capacity of κ-(BEDT-TTF)₂Cu[N(CN)₂]Br Induced by Partial Substitution of Donor Layers