Isotope effect in 13C-substituted (central C=C) κ-phase organic superconductors

Geiser, U.; Williams, Jack M.; Carlson, K. Douglas; Kini, A. M.; Wang, H.H.; Klemm, R. A.; Ferraro, John R.; Kumar, Sudha; Lykke, Keith R.; Würz, Peter; Parker, Deborah Holmes; Fleshler, S.; Dudek, James D.; Eastman, N.L.; Mobley, P.B.; Seaman, J.M.; Sutin, Jason; Yaconi, G.A.; Stout, Phillip J.

doi:10.1016/0379-6779(93)90416-t

Cited by 8 publications

(1 citation statement)

References 18 publications

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“…We have never encountered such a fertile organic conducting system. As for the superconductivity, we have recently found that λ-(BETS) 2 GaBr 1.5 Cl 2.5 becomes a superconductor at high pressure, whose transition temperature ( T c = 9.7 K at 3 kbar) is almost the same as the revised precise T c of the first so-called 10 K-class organic superconductor κ-(BEDT-TTF) 2 Cu(NCS) 2 . , Thus, the λ-type BETS superconductor can be regarded as a kind of 10 K-class organic superconductor. Furthermore, λ-(BETS) 2 GaBr 1.5 Cl 2.5 seems to take a nonmagnetic insulating state at ambient pressure.…”

Section: Introductionmentioning

confidence: 98%

Chemical Control of Electrical Properties and Phase Diagram of a Series of λ-Type BETS Superconductors, λ-(BETS)₂GaBr_xCl_4-_x

et al. 1999

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λ-(BETS)2GaBr x Cl4 - x [BETS = bis(ethylenedithio)tetraselenafulvalene; 0 ≤ x ≤ 2] is a molecular superconductor with strongly correlated conduction electrons. The electrical transport properties of λ-(BETS)2GaBr x Cl4 - x are drastically changed by varying the bromine content x or by applying pressure. At ambient pressure, the superconducting transition could be observed for x < 0.75. The pressure and x dependencies of T c were examined. The M−H curve (M = magnetization; H = magnetic field) at 2 K indicated the almost perfect Meissner state of the superconducting phase of λ-(BETS)2GaCl4. The H c1 is ∼8 Oe for H ⊥ and 12 Oe for H ∥, where H ⊥ and H ∥ are the magnetic fields perpendicular and parallel to the c axis, respectively. The magnetic susceptibility of λ-(BETS)2GaBr x Cl4 - x increases with decreasing temperature to ∼60 K, below which the susceptibility becomes x-dependent and tends to be suppressed with increasing x. The isotropic decrease of the static susceptibility at lower temperature observed in the insulating system with x > 1.0 indicates the insulating ground state seems not to be antiferromagnetic but probably nonmagnetic. The crystal structure determinations of a series of λ-(BETS)2GaBr x Cl4 - x and the calculations of the intermolecular overlap integrals of the highest occupied molecular orbital of BETS were made to elucidate a key factor of the superconducting transition mechanism. The x-dependence of intermolecular overlap integrals seems to suggest that the magnitude of the “spin gap” of the nonmagnetic insulating state tends to be diminished with decreasing x. There exists one intermolecular overlap integral exhibiting a large temperature and x-dependence, which seems to play a crucial role in determining the nature of the ground state.

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Section: Introductionmentioning

confidence: 98%

Chemical Control of Electrical Properties and Phase Diagram of a Series of λ-Type BETS Superconductors, λ-(BETS)₂GaBr_xCl_4-_x

et al. 1999

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The isotope effect for superconductivity in high-Tcβ∗-(ET)2I3 with 13C isotopic substitution in the ring and central C=C atoms of bis (ethylenedithio) tetrathiafulvalence (ET)

Carlson

Kini

Schlueter

et al. 1994

Physica C: Superconductivity

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Determination of a mass isotope effect on Tc in an electron-donor-based organic superconductor, κ-(ET)2Cu(NCS)2, where ET represents bis(ethylenedithio)tetrathiafulvalene

Kini

Carlson

Wang

et al. 1996

Physica C: Superconductivity

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Isotope effect in 13C-substituted (central C=C) κ-phase organic superconductors

Cited by 8 publications

References 18 publications

Chemical Control of Electrical Properties and Phase Diagram of a Series of λ-Type BETS Superconductors, λ-(BETS)₂GaBr_xCl_4-_x

Chemical Control of Electrical Properties and Phase Diagram of a Series of λ-Type BETS Superconductors, λ-(BETS)₂GaBr_xCl_4-_x

The isotope effect for superconductivity in high-Tcβ∗-(ET)2I3 with 13C isotopic substitution in the ring and central C=C atoms of bis (ethylenedithio) tetrathiafulvalence (ET)

Determination of a mass isotope effect on Tc in an electron-donor-based organic superconductor, κ-(ET)2Cu(NCS)2, where ET represents bis(ethylenedithio)tetrathiafulvalene

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Isotope effect in 13C-substituted (central C=C) κ-phase organic superconductors

Cited by 8 publications

References 18 publications

Chemical Control of Electrical Properties and Phase Diagram of a Series of λ-Type BETS Superconductors, λ-(BETS)2GaBrxCl4-x

Chemical Control of Electrical Properties and Phase Diagram of a Series of λ-Type BETS Superconductors, λ-(BETS)2GaBrxCl4-x

The isotope effect for superconductivity in high-Tcβ∗-(ET)2I3 with 13C isotopic substitution in the ring and central C=C atoms of bis (ethylenedithio) tetrathiafulvalence (ET)

Determination of a mass isotope effect on Tc in an electron-donor-based organic superconductor, κ-(ET)2Cu(NCS)2, where ET represents bis(ethylenedithio)tetrathiafulvalene

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Chemical Control of Electrical Properties and Phase Diagram of a Series of λ-Type BETS Superconductors, λ-(BETS)₂GaBr_xCl_4-_x

Chemical Control of Electrical Properties and Phase Diagram of a Series of λ-Type BETS Superconductors, λ-(BETS)₂GaBr_xCl_4-_x