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DYNAMIC DISORDER AT INTERMEDIATE TEMPERATURE AND ITS EFFECT ON THE MAGNETIC PROPERTIES OF THE ORGANIC SUPERCONDUCTOR κ-(BEDTTTF)2Cu[N(CN)2]Br


 
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1. Title Title of document DYNAMIC DISORDER AT INTERMEDIATE TEMPERATURE AND ITS EFFECT ON THE MAGNETIC PROPERTIES OF THE ORGANIC SUPERCONDUCTOR κ-(BEDTTTF)2Cu[N(CN)2]Br
 
2. Creator Author's name, affiliation, country H. El Ouaddi; Equipe des Matériaux Supraconducteurs, Université Ibn Zohr, Faculté des Sciences, BP: 8106, Agadir; Morocco
 
2. Creator Author's name, affiliation, country A. Tirbiyine; Equipe des Matériaux Supraconducteurs, Université Ibn Zohr, Faculté des Sciences, BP: 8106, Agadir Equipe : Molécules, Structure et Interactions avec les Surfaces des Matériaux (MSISM), Université Cadi Ayyad, Faculté Poly-Disciplinaire, B. P. 4162 Safi; Morocco
 
2. Creator Author's name, affiliation, country M. Mamor; Equipe : Molécules, Structure et Interactions avec les Surfaces des Matériaux (MSISM), Université Cadi Ayyad, Faculté Poly-Disciplinaire, B. P. 4162 Safi; Morocco
 
2. Creator Author's name, affiliation, country A. Taoufik; Equipe des Matériaux Supraconducteurs, Université Ibn Zohr, Faculté des Sciences, BP: 8106, Agadir; Morocco
 
2. Creator Author's name, affiliation, country A. Nafidi; Morocco
 
2. Creator Author's name, affiliation, country H. Chaib; Morocco
 
2. Creator Author's name, affiliation, country S. Bahsine; Equipe : Molécules, Structure et Interactions avec les Surfaces des Matériaux (MSISM), Université Cadi Ayyad, Faculté Poly-Disciplinaire, B. P. 4162 Safi; Morocco
 
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4. Description Abstract

The k-(BEDT-TTF)X superconducting salts, [where BEDT-TTF is bis(ethylenedithio)-tetrathiafulvalene, abbreviated as ET, and X is a monovalent anion like Cu[N(CN) ]Br 2 , and for either Cu[N(CN) ]Cl 2 or ( )2 Cu NCN and so on], exhibit interestinmagnetic and superconducting phase transitions [1]. They are quasi-two-dimensional and the interplane coupling is very weak. The basic structural unit is a dimer consisting of two BEDTTTF molecules stacked on top of one another. This layered structure leads to highly

anisotropic electronic properties. These organic superconductors have similar characteristic superconducting properties including the intrinsic Josephson Effect and the mixed-state properties. This similarity suggests the existence of the vortex phase transition in the organic layered superconductors as observed in HTSC. Because the temperature scale is much lower in organic materials, the thermal fluctuation is expected to be small compared to HTSC. Thus, the comparison between the high-Tc and organic superconductors can give important clues as to the nature of vortex phase transitions.

Besides these anomalies around 50 K, unusual time dependencies in magnetic and transport properties have been reported for both deuterated and hydrogenated k-Br near 80 K. For - H - Br 8 k , the superconducting properties have been found to depend on the thermal

history, in particular on how fast the sample had been cooled through 80 K. As mentioned above, the ground state of - D - Br 8 k is strongly sample-dependent: both superconducting as well as non-superconducting crystals are found. Furthermore, superconducting as well as insulating (possibly antiferromagnetic) phases in separated volume parts of the same sample have been reported. Their relative volume fraction was found to depend on the cooling rate Vc employed at around 80 K[2-3-4]: in fast cooled samples, a strong decrease of the diamagnetic signal has been observed, which has been interpreted as indicating a suppression of the superconducting in favour of the magnetic phase.
 
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7. Date (YYYY-MM-DD) 18-04-2012
 
8. Type Status & genre Peer-reviewed Article
 
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9. Format File format PDF
 
10. Identifier Uniform Resource Identifier https://revues.imist.ma/index.php/MJCM/article/view/521
 
11. Source Title; vol., no. (year) Moroccan Journal of Condensed Matter; Vol 13, No 3 (2011)
 
12. Language English=en en
 
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