Magnetic torque of λ-(BETS)2FeCl4

Sasaki, Tadayuki; Uozaki, H.; Endo, Satoshi; Toyota, Naoki

doi:10.1016/s0379-6779(00)00775-x

Cited by 43 publications

(24 citation statements)

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“…The linear increase of the magnetization above the spin-flop field is due to the canted antiferromagnetic state. More precise magnetic torque measurement preformed by Sasaki et al indicated a clear spin-flop transition around 1.2 T, where the easy-axis was found to be in the direction tilted by about 30° from the c-axis to the b*-axis [18]. For low temperatures, the M-H curve shows another step structure accompanied with hysteresis around the critical field Bc [8,18].…”

Section: Transport and Magnetic Propertiesmentioning

confidence: 94%

“…More precise magnetic torque measurement preformed by Sasaki et al indicated a clear spin-flop transition around 1.2 T, where the easy-axis was found to be in the direction tilted by about 30° from the c-axis to the b*-axis [18]. For low temperatures, the M-H curve shows another step structure accompanied with hysteresis around the critical field Bc [8,18]. A metamagnetic-like transition of the π-electrons between AFI and PM phases was proposed since the recovery of the metallic state occurs above Bc [18].…”

Section: Transport and Magnetic Propertiesmentioning

confidence: 97%

“…For low temperatures, the M-H curve shows another step structure accompanied with hysteresis around the critical field Bc [8,18]. A metamagnetic-like transition of the π-electrons between AFI and PM phases was proposed since the recovery of the metallic state occurs above Bc [18]. Finally, the magnetization saturates above 10.5 T.…”

Section: Transport and Magnetic Propertiesmentioning

confidence: 97%

See 2 more Smart Citations

Antiferromagnetic Insulating Ground State of Molecular π-d System Λ-(BETS)2FeCl4 (BETS = Bis(ethylenedithio)tetraselenafulvalene): A Theoretical and Experimental Review

2017

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Abstract:The π-d molecular conductor λ-(BETS) 2 FeCl 4 , where BETS is bis(ethylenedithio) tetraselenafulvalene, has attracted considerable interest for the discovery of its field induced superconducting state. A mystery of this system is its antiferromagnetic insulating ground state. The point still under strong debate is whether the d spins in Fe 3+ are ordered or not. Here, we review experimental and theoretical studies on the antiferromagnetic insulating phase in λ-(BETS) 2 FeCl 4 and mention our perspective based on our ESR measurements for λ-(BETS) 2 Fe x Ga 1−x Cl 4 . Our ESR results indicate that the π-d interaction in the system is very strong and there is no sign of paramagnetic Fe spins in the antiferromagnetic ground state.

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Section: Transport and Magnetic Propertiesmentioning

confidence: 94%

Section: Transport and Magnetic Propertiesmentioning

confidence: 97%

Section: Transport and Magnetic Propertiesmentioning

confidence: 97%

See 1 more Smart Citation

Antiferromagnetic Insulating Ground State of Molecular π-d System Λ-(BETS)2FeCl4 (BETS = Bis(ethylenedithio)tetraselenafulvalene): A Theoretical and Experimental Review

2017

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“…According to the torque measurement by Sasaki et al [16], the c-axis is tilted by about θ = 30° from the easy axis. Considering the tilt angle θ, the total magnetization component M d parallel to H can be obtained as ) (2) where the angles α between H and H eff + and β between H and H eff − can be determined from θ, H πd , and H (see Figure 6b).…”

Section: Magnetic and Thermal Properties In Afi Phasementioning

confidence: 99%

Paramagnetic Metal—Antiferromagnetic Insulator Transition in π-d System λ-BETS2FeCl4, BETS = Bis(ethylenedithio)tetraselenafulvalene

et al. 2012

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Quasi-two-dimensional organic conductor λ-BETS 2 FeCl 4 (BETS = bis(ethylenedithio)tetraselenafulvalene) transforms from a paramagnetic metal (PM) to an antiferromagnetic insulator (AFI) at a transition temperature, T MI , of 8.3 K under zero magnetic field. To understand the mechanism of this PM-AFI phase transition, we studied the thermodynamic properties of λ-BETS 2 FeCl 4 . We observed, below T MI , a six-level Schottky hump in its specific heat and a broad shoulder in its magnetic susceptibility. Just below the transition temperature T MI , about 80% of 3d spin degree of freedom is sustained. These temperature dependences clarify that π and 3d spins do not cooperatively form the AF order at T MI . In λ-BETS 2 Fe x Ga 1−x Cl 4 system, the increasing Fe 3d spin density enhances the internal magnetic field caused by π spin antiferromagnetic (AF) ordering, although the 3d spin itself maintains large entropy against the AF ordering. It was confirmed that the Fe 3d spin provided favorable conditions for this mysterious PM-AFI phase transition in the π electron system. We propose that this phase transition originates from the magnetic anisotropy introduced by the π-d interaction, which suppressed the low dimensional fluctuation in the π spin system.

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“…Therefore, the susceptibility decreases at low temperature. Furthermore, according to the torque measurement, the tilt angle θ between the easy axis and the c axis is estimated as 30 • in the c-b * plane [9]. Moreover, according to the sextet Fe Mössbauer signals, H int ∼ 4 T [10].…”

Section: Introductionmentioning

confidence: 99%

Role of the d−d interaction in the antiferromagnetic phase of λ−(BEDT−STF)2FeCl
Minamidate
¹
,
Shindo
²
,
Ihara
³

et al. 2018
Phys. Rev. B
12
0
4
0
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Magnetic susceptibility and proton nuclear magnetic resonance ( 1 H-NMR) measurements were performed for the quasi-two-dimensional π -d interacting system λ-(BEDT-STF) 2 FeCl 4 at ambient pressure. Magnetic susceptibility arising from the 3d spins of the FeCl 4 anion show an anisotropy at low temperature and its temperature dependence for the external field parallel to the c axis is described as a broad peak structure at 8 K. A sharp peak in the temperature dependence of T −1 1 associated with the antiferromagnetic (AF) transition is observed at T AF = 16 K, together with the drastic splitting of the NMR spectrum below T AF . The relation between the static susceptibility and the splitting of the NMR shift suggests the existence of the relatively strong d-d AF interaction. These results can be explained by the model considering the AF-coupled d-spin system in the AF long-range-ordered π -spin system. We find that the AF phases in λ-type salts can be universally explained by this model.

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Magnetic torque of λ-(BETS)2FeCl4

Cited by 43 publications

References 0 publications

Antiferromagnetic Insulating Ground State of Molecular π-d System Λ-(BETS)2FeCl4 (BETS = Bis(ethylenedithio)tetraselenafulvalene): A Theoretical and Experimental Review

Antiferromagnetic Insulating Ground State of Molecular π-d System Λ-(BETS)2FeCl4 (BETS = Bis(ethylenedithio)tetraselenafulvalene): A Theoretical and Experimental Review

Paramagnetic Metal—Antiferromagnetic Insulator Transition in π-d System λ-BETS2FeCl4, BETS = Bis(ethylenedithio)tetraselenafulvalene

Role of the d−d interaction in the antiferromagnetic phase of λ−(BEDT−STF)2FeCl
Minamidate
¹
,
Shindo
²
,
Ihara
³

et al. 2018
Phys. Rev. B
12
0
4
0
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Magnetic torque of λ-(BETS)2FeCl4

Cited by 43 publications

References 0 publications

Antiferromagnetic Insulating Ground State of Molecular π-d System Λ-(BETS)2FeCl4 (BETS = Bis(ethylenedithio)tetraselenafulvalene): A Theoretical and Experimental Review

Antiferromagnetic Insulating Ground State of Molecular π-d System Λ-(BETS)2FeCl4 (BETS = Bis(ethylenedithio)tetraselenafulvalene): A Theoretical and Experimental Review

Paramagnetic Metal—Antiferromagnetic Insulator Transition in π-d System λ-BETS2FeCl4, BETS = Bis(ethylenedithio)tetraselenafulvalene

Role of the d−d interaction in the antiferromagnetic phase of λ−(BEDT−STF)2FeClMinamidate1, Shindo2, Ihara3 et al. 2018Phys. Rev. B12040View full textAdd to dashboardCite

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Role of the d−d interaction in the antiferromagnetic phase of λ−(BEDT−STF)2FeCl
Minamidate
¹
,
Shindo
²
,
Ihara
³

et al. 2018
Phys. Rev. B
12
0
4
0
View full text Add to dashboard Cite