2K-superconducting state with less disorder in the organic superconductor ß-(BEDT-TTF)2I3

S. Kagoshima, M. Hasumi, Yoshio Nogami, N. Kinoshita, H. Anzai, M. Tokumoto, G. Saito

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Annealing of the title compound at about 110 K for 20-40 hr causes a change in the superstructure, and gives rise to two superconducting states with the critical temperatues of 2 K and ∼7.5 K. The former state is found to occupy most of the sample volume. This state having Tc ∼ 2K, found in the present study for the first time,has a lower resistance and a narrower EPR linewidth in its normal state than this compound without annealing has. A conjecture is given that the state with Tc ∼ 2 K has only the A-type conformation of BEDT-TTFmolecules leading to the reduction of disorder related to the conformational degree of freedom and to the resultant increase of Tc from 1-1.5 K of the so-called "low-Tc" state of this material. The other state with Tc ∼ 7.5K is interpreted to be nothing but the "high-Tc" state having no superstructure.

Original languageEnglish
Pages (from-to)843-846
Number of pages4
JournalSolid State Communications
Volume71
Issue number10
DOIs
Publication statusPublished - 1989
Externally publishedYes

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organic superconductors
Superconducting materials
disorders
Annealing
annealing
low resistance
Linewidth
Paramagnetic resonance
Conformations
degrees of freedom
causes
BEDT-TTF

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

2K-superconducting state with less disorder in the organic superconductor ß-(BEDT-TTF)2I3. / Kagoshima, S.; Hasumi, M.; Nogami, Yoshio; Kinoshita, N.; Anzai, H.; Tokumoto, M.; Saito, G.

In: Solid State Communications, Vol. 71, No. 10, 1989, p. 843-846.

Research output: Contribution to journalArticle

Kagoshima, S, Hasumi, M, Nogami, Y, Kinoshita, N, Anzai, H, Tokumoto, M & Saito, G 1989, '2K-superconducting state with less disorder in the organic superconductor ß-(BEDT-TTF)2I3', Solid State Communications, vol. 71, no. 10, pp. 843-846. https://doi.org/10.1016/0038-1098(89)90209-3
Kagoshima, S. ; Hasumi, M. ; Nogami, Yoshio ; Kinoshita, N. ; Anzai, H. ; Tokumoto, M. ; Saito, G. / 2K-superconducting state with less disorder in the organic superconductor ß-(BEDT-TTF)2I3. In: Solid State Communications. 1989 ; Vol. 71, No. 10. pp. 843-846.
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abstract = "Annealing of the title compound at about 110 K for 20-40 hr causes a change in the superstructure, and gives rise to two superconducting states with the critical temperatues of 2 K and ∼7.5 K. The former state is found to occupy most of the sample volume. This state having Tc ∼ 2K, found in the present study for the first time,has a lower resistance and a narrower EPR linewidth in its normal state than this compound without annealing has. A conjecture is given that the state with Tc ∼ 2 K has only the A-type conformation of BEDT-TTFmolecules leading to the reduction of disorder related to the conformational degree of freedom and to the resultant increase of Tc from 1-1.5 K of the so-called {"}low-Tc{"} state of this material. The other state with Tc ∼ 7.5K is interpreted to be nothing but the {"}high-Tc{"} state having no superstructure.",
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T1 - 2K-superconducting state with less disorder in the organic superconductor ß-(BEDT-TTF)2I3

AU - Kagoshima, S.

AU - Hasumi, M.

AU - Nogami, Yoshio

AU - Kinoshita, N.

AU - Anzai, H.

AU - Tokumoto, M.

AU - Saito, G.

PY - 1989

Y1 - 1989

N2 - Annealing of the title compound at about 110 K for 20-40 hr causes a change in the superstructure, and gives rise to two superconducting states with the critical temperatues of 2 K and ∼7.5 K. The former state is found to occupy most of the sample volume. This state having Tc ∼ 2K, found in the present study for the first time,has a lower resistance and a narrower EPR linewidth in its normal state than this compound without annealing has. A conjecture is given that the state with Tc ∼ 2 K has only the A-type conformation of BEDT-TTFmolecules leading to the reduction of disorder related to the conformational degree of freedom and to the resultant increase of Tc from 1-1.5 K of the so-called "low-Tc" state of this material. The other state with Tc ∼ 7.5K is interpreted to be nothing but the "high-Tc" state having no superstructure.

AB - Annealing of the title compound at about 110 K for 20-40 hr causes a change in the superstructure, and gives rise to two superconducting states with the critical temperatues of 2 K and ∼7.5 K. The former state is found to occupy most of the sample volume. This state having Tc ∼ 2K, found in the present study for the first time,has a lower resistance and a narrower EPR linewidth in its normal state than this compound without annealing has. A conjecture is given that the state with Tc ∼ 2 K has only the A-type conformation of BEDT-TTFmolecules leading to the reduction of disorder related to the conformational degree of freedom and to the resultant increase of Tc from 1-1.5 K of the so-called "low-Tc" state of this material. The other state with Tc ∼ 7.5K is interpreted to be nothing but the "high-Tc" state having no superstructure.

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