Superconductivity in a synthetic organic conductor (TMTSF)2PF6(†)

The magnetic breakdown effect can be seen by the growth of new frequencies in the quantum oscillations in clean metals as a function of magnetic field. We have studied the variation of the amplitudes in the quantum oscillations in the resistance (the Shubnikov-de Haas effect) as a function of angle in the quasi-two dimensional-organic conductor κ-(BEDT-TTF)2Cu(NCS)2. The measurements were made by means of a radio frequency (rf) tank circuit (~ 50 MHz) at very high magnetic fields(50T-60T) and low temperature(500 mK). The geometry of the rf excitation we used excited in-plane currents, and therefore we measured the in-plane resistivity. In contrast to conventional transport measurements that measure the inter-plane resistivity, the in-plane resistivity is dominated by the magnetic breakdown frequencies. As a result we measured much higher breakdown frequency amplitudes than conventional transport experiments. As is expected, the angular dependence of the Shubnikov-de Haas frequencies have a 1/cosθ behavior. This is due to the change of the cross sectional area of the tubular Fermi surface as the angle with respect to the magnetic field is changed. The amplitude of the oscillations changes due to the spin splitting factor which takes into account the ratio between the spin splitting and the energy spacing of the Landau levels which also has 1/cosθ behavior. We show that our data agree with the semi-classical theory (Lifshitz-Kosevich formula).

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Charge Transport in Antiferromagnetic Insulating Phase of Two-Dimensional Organic Conductor λ-(BETS)2FeCl4

Journal of the Physical Society of Japan ◽

10.7566/jpsj.85.064703 ◽

2016 ◽

Vol 85 (6) ◽

pp. 064703 ◽

Cited By ~ 7

Author(s):

Shiori Sugiura ◽

Kazuo Shimada ◽

Naoya Tajima ◽

Yutaka Nishio ◽

Taichi Terashima ◽

...

Keyword(s):

Charge Transport ◽

Two Dimensional ◽

Organic Conductor ◽

Insulating Phase

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Direct Observation of Spin-Splitting of the Shubnikov- de Haas Oscillations in a Quasi-Two-Dimensional Organic Conductor (BEDT-TTF)2KHg(SCN)4

Journal of the Physical Society of Japan ◽

10.1143/jpsj.59.2324 ◽

1990 ◽

Vol 59 (7) ◽

pp. 2324-2327 ◽

Cited By ~ 45

Author(s):

Madoka Tokumoto ◽

A. G. Swanson ◽

J. S. Brooks ◽

C. C. Agosta ◽

S. T. Hannahs ◽

...

Keyword(s):

Direct Observation ◽

Spin Splitting ◽

Two Dimensional ◽

Organic Conductor ◽

Shubnikov De Haas Oscillations

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Infrared near-isotropy in a mixed stack organic conductor: OMTSF-Ni(DMIT)2

Synthetic Metals ◽

10.1016/0379-6779(93)90349-2 ◽

1993 ◽

Vol 56 (1) ◽

pp. 1925-1930 ◽

Cited By ~ 5

Author(s):

C.S. Jacobsen ◽

V.M. Yartsev ◽

D.B. Tanner ◽

K. Bechgaard

Keyword(s):

Organic Conductor

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Magnetic property of an organic conductor, (TTM-TTF) (I3)0.823

Synthetic Metals ◽

10.1016/0379-6779(87)90442-5 ◽

1987 ◽

Vol 19 (1-3) ◽

pp. 721-726 ◽

Cited By ~ 5

Author(s):

K. Imaeda ◽

T. Enoki ◽

T. Mori ◽

P. Wu ◽

M. Kobayashi ◽

...

Keyword(s):

Magnetic Property ◽

Organic Conductor

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Charge Transport in the Organic Conductor Quinolinium Ditetracyanoquinodimethanide [Qn(TCNO)2]

Physical Review Letters ◽

10.1103/physrevlett.45.53 ◽

1980 ◽

Vol 45 (1) ◽

pp. 53-56 ◽

Cited By ~ 27

Author(s):

F. Devreux ◽

M. Nechtschein ◽

G. Grüner

Keyword(s):

Charge Transport ◽

Organic Conductor

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HIGH FIELD PHASE DIAGRAM OF THE FIELD-INDUCED SUPERCONDUCTING STATE OF λ-(BETS)2FeCl4

International Journal of Modern Physics B ◽

10.1142/s0217979202013663 ◽

2002 ◽

Vol 16 (20n22) ◽

pp. 3101-3104

Author(s):

L. BALICAS ◽

J. S. BROOKS ◽

K. STORR ◽

S. UJI ◽

M. TOKUMOTO ◽

...

Keyword(s):

Magnetic Field ◽

Superconducting State ◽

Ground State ◽

Electrical Transport ◽

High Field ◽

Two Dimensional ◽

Exchange Field ◽

Organic Conductor ◽

Field Phase ◽

Antiferromagnetic Ground State

We investigate by electrical transport the field-induced superconducting state (FISC) in the organic conductor λ- (BETS) 2 FeCl 4. Below 4 K, antiferromagnetic-insulator, metallic, and eventually superconducting (FISC) ground states are observed with increasing in-plane magnetic field. The FISC state survives between 18 and 41 T, and can be interpreted in terms of the Jaccarino-Peter effect, where the external magnetic field compensates the exchange field of aligned Fe 3+ ions. We further argue that the Fe 3+ moments are essential to stabilize the resulting singlet, two-dimensional superconducting state. Here we provide experimental evidence indicating that this state, as well as the insulating antiferromagnetic ground state, is extremely sensitive to hydrostatic pressure.

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