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Syntheses and Properties of k-Phase Organic Superconductors

Published online by Cambridge University Press:  25 February 2011

H. Hau Wang ,
K. D. Carlson ,
U. Geiser ,
A. M. Kini ,
A. J. Schultz ,
J. M. Williams ,
U. Welp ,
K. E. Darula ,
V. M. Hitsman  and
M. W. Lathrop
...Show all authors
H. Hau Wang
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
K. D. Carlson
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
U. Geiser
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
A. M. Kini
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
A. J. Schultz
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
J. M. Williams
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
U. Welp
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
K. E. Darula
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
V. M. Hitsman
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
M. W. Lathrop
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
L. A. Megna
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
P. R. Mobley
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
G. A. Yaconi
Affiliation:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, IL 60439
J. E. Schirber
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
D. L. Overmyert
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
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Abstract

The syntheses and physical properties of K-(ET)2CU[N(CN)2]X (X = Br and Cl) are summarized. The K-(ET)2Cu [N(CN)2] Br salt is the highest Tc radical-cation based ambient pressure organic superconductor (Tc = 11.6 K), and the K-(ET)2CU [N(CN)2] C1 salt becomes a superconductor at even higher Tc under 0.3 kbar hydrostatic pressure (Tc = 12.8 K). The similarities and differences between K-(ET)2Cu[N(CN)2]Br and K-(ET)2CU(NCS)2 (TC = 10.4 K) are presented. The X-ray structures at 127 K reveal that the S-S contacts shorten between ET dimers in the former compound while the S-S contacts shorten within dimers in the latter. The differences in their ESR linewidth behavior is also explained in terms of the structural differences. A semiconducting compound, (ET)Cu[N(CN)2]2, isolated during K-(ET)2Cu[N(CN)2]Cl synthesis is also reported. The ESR measurements of the K-(ET)2Cu[N(CN)2]Cl salt indicate that the phase transition near 40 K is similar to the spin density wave transition in (TMTSF)2SbF6. A new class of organic superconductors, K-(ET)2CU2(CN)3 and K-(ET)2Cu2(CN)3.δBrδ, is reported with Tc's of 2.8 K (1.5 kbar) and 2.6 K (1 kbar), respectively.

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