Fabrication and Characterization of Thin Films of the Organic Superconductor α_{t}-(BEDT-TTF)_{2}I_{3}

• Authors: J. Moldenhauer , H. Wachtel , D. Schweitzer , B. Gompf , W. Eisenmenger , P. Bele , H. Brunner , H. Keller
• Languages of publication: EN

Abstracts

EN

α-(BEDT-TTF)_{2}I_{3} is a quasi-two-dimensional organic metal with a metal-insulator phase transition at 135 K. Thermal treatment at about 80°C leads to the metallic system α_{t}-(BEDT-TTF)_{2}I_{3}, which becomes supercon­ducting below 8 K. Thin films of the α-phase (thickness between 500 and 3000 Å) have been evaporated in high vacuum onto several substrates and characterized by means of X-ray diffraction, scanning electron microscopy, atomic force microscopy and low field microwave absorption. Depending on the temperature of the substrate and the evaporation rate, the films exhibit different degrees of microcrystallinity, which under certain conditions can be strongly reduced and a completely covering film can be obtained. X-ray diffraction spectra reveal a high orientation with the c-axis perpendicular to the substrate and as well the successful conversion into the α_{t}-phase by tem­pering. Scanning electron microscopy and atomic force microscopy investiga­tions prove that the conversion takes place without reducing the mechanical quality of the films. Low-field microwave-absorption experiments show that the α_{t}-films become superconducting with an onset at 9 K.

Keywords

EN

74.70.Kn; 73.50.-h; 81.15.Gh

Discipline

• 74.70.Kn: Organic superconductors
• 81.15.Gh: Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)(for chemistry of MOCVD, see 82.33.Ya in physical chemistry and chemical physics)
• 73.50.-h: Electronic transport phenomena in thin films(for electronic transport in mesoscopic systems, see 73.23.-b; see also 73.40.-c Electronic transport in interface structures; for electronic transport in nanoscale materials and structures, see 73.63.-b)

• Journal: Acta Physica Polonica A
• Year: 1995
• Volume: 87
• Issue: 4-5
• Pages: 823-827

Dates

published

1995-04

Contributors

author

J. Moldenhauer

• 3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

author

H. Wachtel

• 3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

author

D. Schweitzer

• 3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

author

B. Gompf

• 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

author

W. Eisenmenger

• 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

author

P. Bele

• MPI für medizinische Forschung, AG: Molekülkristalle, Jahnstr. 29, 69120 Heidelberg, Germany

author

H. Brunner

• MPI für medizinische Forschung, AG: Molekülkristalle, Jahnstr. 29, 69120 Heidelberg, Germany

author

H. Keller

• Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 269, 69120 Heidelberg, Germany

Identifiers

DOI

10.12693/APhysPolA.87.823