TY - JOUR
T1 -
Critical Field Anisotropy in “2K-Superconducting State” of Organic Superconductor β-(BEDT-TTF)
2
I
3
AU - Sasaki, Takahiko
AU - Toyota, Naoki
AU - Hasumi, Masahiko
AU - Osada, Toshihito
AU - Kagoshima, Seiichi
AU - Anzai, Hiroyuki
AU - Tokumoto, Madoka
AU - Kinoshita, Nobumori
PY - 1989/1/1
Y1 - 1989/1/1
N2 -
The anisotropy of the upper critical field H
c2
has been measured at ambient pressure on a layered organic superconductor β-(BEDT-TTF)
2
I
3
both in the states before and after annealing at 109 K for 120 hours. By annealing, the critical temperature T
c
increases from 1.4 to 2.08 K, while the H
c2±plane
increases and the anisotropy, H
c2//plane
/H
c2±Plane
, decreases. The angular dependences of H
c2
for both states are explained in terms of the effective mass model. It is clarified that the enhanced T
c
which is ascribed to the annealing-induced configurational orderings of ethylene groups is closely related to the enhanced effective mass in the basal plane.
AB -
The anisotropy of the upper critical field H
c2
has been measured at ambient pressure on a layered organic superconductor β-(BEDT-TTF)
2
I
3
both in the states before and after annealing at 109 K for 120 hours. By annealing, the critical temperature T
c
increases from 1.4 to 2.08 K, while the H
c2±plane
increases and the anisotropy, H
c2//plane
/H
c2±Plane
, decreases. The angular dependences of H
c2
for both states are explained in terms of the effective mass model. It is clarified that the enhanced T
c
which is ascribed to the annealing-induced configurational orderings of ethylene groups is closely related to the enhanced effective mass in the basal plane.
KW - Critical field anisotropy
KW - β(BEDT-TTF) I
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U2 - 10.1143/JPSJ.58.3477
DO - 10.1143/JPSJ.58.3477
M3 - Article
AN - SCOPUS:2842559511
VL - 58
SP - 3477
EP - 3480
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 10
ER -