Superconducting and semiconducting magnetic charge transfer salts: (BEDT-TTF)AFe(C{sub 2}O{sub 4}){sub 3}.C{sub 6}H{sub 5}CN (A=H{sub 2}O, K, NH{sub 4})

Journal Article · Wed Dec 13 04:00:00 EST 1995 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja00154a022· OSTI ID:171384

Kurmoo, M; Graham, A W; Day, P ^[1]; Coles, S J; Hursthouse, M B ^[2]; Caulfield, J L; Singleton, J; Pratt, F L; Hayes, W ^[3]; Ducasse, L; Guinneau, P ^[4]

---

1. Royal Institution of Great Britain, London (United Kingdom)
2. Univ. College of Wales, Cardiff (United Kingdom)
3. Clarendon Lab., Oxford (United Kingdom)
4. Universite Bordeaux, Talence (France)

We have shown that the hexagonal layer motif [AM{sup III}(C{sub 2} O{sub 4}){sub 3}]{sup n-} containing bridging oxalate groups, which has been shown to form a wide variety of compounds with electronically inactive counter-cations having unusual cooperative magnetic properties, can also stabilize lattices containing the organic {pi}-donor BEDT-TTF. In the compounds whose structures we describe here, (BEDT-TTF){sub 4}AFe(C{sub 2}O{sub 4}){sub 3}.C{sub 6}H{sub 5} CN (A = H{sub 2}O, K, NH{sub 4}), the lattice is stabilized by C{sub 6} H{sub 5}CN molecules included in the hexagonal cavities. The packing of the BEDT-TTF in the A = K, NH{sub 4} phases is of a type not previously observed with spin-paired (BEDT-TTF){sub 2}{sup 2+} separated by closed shell (BEDT-TTF){sup 0}, while that in the superconductor is of {Beta}{double_prime} type. Both the superconducting A = H{sub 2}O and semiconducting A = K, NH{sub 4} phases contain high spin 3d{sup 5} Fe{sup III} with only very weak exchange interaction between them. Additional low temperature and high magnetic field experiments (e.g., of Schubnikov-de Haas oscillatory magnetoresistance) will be needed to delineate the Fermi surface in the superconductor. 36 refs., 11 figs., 4 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 171384
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 49 Vol. 117; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ANIONS
BEDT-TTF
BOND ANGLE
BOND LENGTHS
CATIONS
CHARGE TRANSPORT
CRYSTAL STRUCTURE
ELECTRON SPECTRA
MAGNETIC SUSCEPTIBILITY
OPTICAL PROPERTIES
POTASSIUM COMPLEXES
SALTS
SEMICONDUCTOR MATERIALS
SUPERCONDUCTORS