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Title: Unusual behavior in the upper critical magnetic fields of the ambient-pressure organic superconductor. kappa. -(BEDT-TTF) sub 2 Cu(N(CN) sub 2 )Br (where BEDT-TTF represents bis(ethylenedithio) tetrathiofulvalene)

Abstract

We report a determination of the temperature dependence of the upper critical magnetic fields {ital H}{sub {ital c}2} for {kappa}-(BEDT-TTF){sub 2}Cu(N(CN){sub 2})Br, with the use of dc-magnetization measurements that show a well-defined diamagnetic onset. We find large slopes of {minus}20 T/K and {minus}2.2 T/K for {bold H}{parallel}{ital ac} and {bold H}{parallel}{ital b}, respectively, which lead to coherence lengths of 37 and 4 A. There is unusual structure in the critical fields and a possible dimensional crossover at {ital T}/{ital T}{sub {ital c}}{approximately}0.97 for {bold H}{parallel}{ital ac}. Neither the slopes nor the structure are observable in the superconducting transition measured by ac magnetoresistance, which exhibits strong magnetic-field broadening similar to that of the high-{Tc} copper oxide superconductor YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. We find a strong depression of {ital T}{sub {ital c}}, as large as 1.2 K, when the sample is rapidly cooled.

Authors:
; ; ; ; ; ; ; ; ; ;  [1]
  1. (Materials Science Division, Argonne National Laboratory, Argonne, IL (USA) Chemistry Divisions, Argonne National Laboratory, Argonne, IL (USA))
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL
OSTI Identifier:
6360073
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (USA)
Additional Journal Information:
Journal Volume: 42:13; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BEDT-TTF; CRITICAL FIELD; COPPER COMPOUNDS; ORGANIC BROMINE COMPOUNDS; MAGNETIZATION; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; ULTRALOW TEMPERATURE; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; HETEROCYCLIC COMPOUNDS; MAGNETIC FIELDS; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; ORGANIC SULFUR COMPOUNDS; ORGANIC SUPERCONDUCTORS; PHYSICAL PROPERTIES; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; 360603* - Materials- Properties

Citation Formats

Kwok, W.K., Welp, U., Carlson, K.D., Crabtree, G.W., Vandervoort, K.G., Wang, H.H., Kini, A.M., Williams, J.M., Stupka, D.L., Montgomery, L.K., and Thompson, J.E. Unusual behavior in the upper critical magnetic fields of the ambient-pressure organic superconductor. kappa. -(BEDT-TTF) sub 2 Cu(N(CN) sub 2 )Br (where BEDT-TTF represents bis(ethylenedithio) tetrathiofulvalene). United States: N. p., 1990. Web. doi:10.1103/PhysRevB.42.8686.
Kwok, W.K., Welp, U., Carlson, K.D., Crabtree, G.W., Vandervoort, K.G., Wang, H.H., Kini, A.M., Williams, J.M., Stupka, D.L., Montgomery, L.K., & Thompson, J.E. Unusual behavior in the upper critical magnetic fields of the ambient-pressure organic superconductor. kappa. -(BEDT-TTF) sub 2 Cu(N(CN) sub 2 )Br (where BEDT-TTF represents bis(ethylenedithio) tetrathiofulvalene). United States. doi:10.1103/PhysRevB.42.8686.
Kwok, W.K., Welp, U., Carlson, K.D., Crabtree, G.W., Vandervoort, K.G., Wang, H.H., Kini, A.M., Williams, J.M., Stupka, D.L., Montgomery, L.K., and Thompson, J.E. Thu . "Unusual behavior in the upper critical magnetic fields of the ambient-pressure organic superconductor. kappa. -(BEDT-TTF) sub 2 Cu(N(CN) sub 2 )Br (where BEDT-TTF represents bis(ethylenedithio) tetrathiofulvalene)". United States. doi:10.1103/PhysRevB.42.8686.
@article{osti_6360073,
title = {Unusual behavior in the upper critical magnetic fields of the ambient-pressure organic superconductor. kappa. -(BEDT-TTF) sub 2 Cu(N(CN) sub 2 )Br (where BEDT-TTF represents bis(ethylenedithio) tetrathiofulvalene)},
author = {Kwok, W.K. and Welp, U. and Carlson, K.D. and Crabtree, G.W. and Vandervoort, K.G. and Wang, H.H. and Kini, A.M. and Williams, J.M. and Stupka, D.L. and Montgomery, L.K. and Thompson, J.E.},
abstractNote = {We report a determination of the temperature dependence of the upper critical magnetic fields {ital H}{sub {ital c}2} for {kappa}-(BEDT-TTF){sub 2}Cu(N(CN){sub 2})Br, with the use of dc-magnetization measurements that show a well-defined diamagnetic onset. We find large slopes of {minus}20 T/K and {minus}2.2 T/K for {bold H}{parallel}{ital ac} and {bold H}{parallel}{ital b}, respectively, which lead to coherence lengths of 37 and 4 A. There is unusual structure in the critical fields and a possible dimensional crossover at {ital T}/{ital T}{sub {ital c}}{approximately}0.97 for {bold H}{parallel}{ital ac}. Neither the slopes nor the structure are observable in the superconducting transition measured by ac magnetoresistance, which exhibits strong magnetic-field broadening similar to that of the high-{Tc} copper oxide superconductor YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. We find a strong depression of {ital T}{sub {ital c}}, as large as 1.2 K, when the sample is rapidly cooled.},
doi = {10.1103/PhysRevB.42.8686},
journal = {Physical Review, B: Condensed Matter; (USA)},
issn = {0163-1829},
number = ,
volume = 42:13,
place = {United States},
year = {1990},
month = {11}
}