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Anisotropy of Magnetoresistance and Shubnikov-de Haas Oscillations in Organic Metal (ET)_{3}CuCl_{4} • H_{2}O

100%

Pesotskii S. I., Kovalev A. E., Lyubovskii R. B., Kushch N. D.

Acta Physica Polonica A

1995

vol. 87

issue 4-5

773-776

Behavior of the magnetoresistance has been studied in organic quasi two-dimensional metal (ET)_{3}CuCl_{4}•H_{2}O. Shubnikov-de Haas oscillations have been observed at the magnetic field directions near H ∥ c*. The oscillations frequency at H ∥ c* equals 45 T that corresponds approximately to 1% of the first Brillouin zone cross-section. The angle dependence of the oscillations frequency allows one to imagine at least the part of Fermi surface in the form of cylinder with an axis along c*.

Peculiarities of the Electronic Properties of the κ-Phase Structures (BEDT-TTF)_{2}Cu(N(CN)_{2})X with X=Cl, Br, I

76%

Andres K., Posselt H., Kushch N. D., Kund M., Biberacher W., Saito G.

Acta Physica Polonica A

1995

vol. 87

issue 4-5

761-766

The structure of the title compounds is similar to other κ-phase structures with respect to the checkerboard-like arrangement of the ET dimers (ET = BEDT-TTF) in the conducting planes, but different by the tilt alternation of these dimers in successive planes. The resulting inequivalence of these planes tends to destabilize the metallic state which becomes extremely sensitive to changes in the S-S overlaps of neighbouring ET molecules. Such changes may result from anion substitution, lattice expansion, or also from ordering effects of the ethylene end groups of the ET molecules. They lead to quite different electronic properties of the three isostructural compounds. We focus especially on the strongly pressure-dependent properties of the Cl-compound, where a coexistence of magnetically ordered and superconducting states with rather spectacular superconducting reentrance effects is observed.

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2 Acta Physica Polonica A

2 1995

2 Kushch N. D.

1 Andres K.

1 Biberacher W.

1 Kovalev A. E.

1 Kund M.

1 Lyubovskii R. B.

1 Pesotskii S. I.

1 Posselt H.

1 Saito G.

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Anisotropy of Magnetoresistance and Shubnikov-de Haas Oscillations in Organic Metal (ET)_{3}CuCl_{4} • H_{2}O

Peculiarities of the Electronic Properties of the κ-Phase Structures (BEDT-TTF)_{2}Cu(N(CN)_{2})X with X=Cl, Br, I