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Title: Specific heat of the ambient-pressure organic superconductor. beta. -di(bis(ethylenedithio)tetrathiafulvalene) triiodide (. beta. -(BEDT-TTF)/sub 2/I/sub 3/)

Abstract

We have measured the specific heat of single crystals of the ambient-pressure superconductor ..beta..-(BEDT-TTF)/sub 2/I/sub 3/, abbreviated ..beta..-(ET)/sub 2/I/sub 3/, from 0.7 to 18 K in zero and applied magnetic fields. No bulk specific-heat anomaly in the vicinity of T/sub c/ was observed, although Meissner-effect measurements (Hparallelc() performed on these same crystals yield a volume percent superconductivity of at least 25% at 0.8 K. We find a ..gamma.. = 24 +- 3 mJ/mol K/sup 2/, which is larger than the value for the only previously known ambient-pressure superconductor, the Se-based (TMTSF)/sub 2/ClO/sub 4/ (TMTSF denotes tetramethyltetraselenafulvalene). This difference is due primarily to the greater density of S atoms in ..beta..-(ET)/sub 2/I/sub 3/ compared to the density of Se atoms in (TMTSF)/sub 2/ClO/sub 4/. The response of the low-temperature specific heat to fields up to 10 T aligned along c( was 0 to +- 3%, in sharp contrast to previous reports of a 20% increase in the specific heat of (TMTSF)/sub 2/ClO/sub 4/ in a field of 2 T. No evidence for a high-field magnetic or insulating state similar to that observed in (TMTSF)/sub 2/ClO/sub 4/ was found for ..beta..-(ET)/sub 2/I/sub 3/. New results on the specific heat in applied fieldsmore » for (TMTSF)/sub 2/ClO/sub 4/ are presented.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
OSTI Identifier:
6438955
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B: Condens. Matter; (United States)
Additional Journal Information:
Journal Volume: 33:3
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ETHYLENE; SPECIFIC HEAT; SUPERCONDUCTORS; TTF; BAND THEORY; CRYSTAL STRUCTURE; ELECTRIC CONDUCTIVITY; EXPERIMENTAL DATA; FERMI LEVEL; IODIDES; LOW PRESSURE; MAGNETIC FIELDS; MONOCRYSTALS; ULTRALOW TEMPERATURE; VERY LOW TEMPERATURE; ALKENES; CRYSTALS; DATA; ELECTRICAL PROPERTIES; ENERGY LEVELS; HALIDES; HALOGEN COMPOUNDS; HETEROCYCLIC COMPOUNDS; HYDROCARBONS; INFORMATION; IODINE COMPOUNDS; NUMERICAL DATA; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; 360603* - Materials- Properties

Citation Formats

Stewart, G R, O'Rourke, J, Crabtree, G W, Carlson, K D, Wang, H H, Williams, J M, Gross, F, and Andres, K. Specific heat of the ambient-pressure organic superconductor. beta. -di(bis(ethylenedithio)tetrathiafulvalene) triiodide (. beta. -(BEDT-TTF)/sub 2/I/sub 3/). United States: N. p., 1986. Web. doi:10.1103/PhysRevB.33.2046.
Stewart, G R, O'Rourke, J, Crabtree, G W, Carlson, K D, Wang, H H, Williams, J M, Gross, F, & Andres, K. Specific heat of the ambient-pressure organic superconductor. beta. -di(bis(ethylenedithio)tetrathiafulvalene) triiodide (. beta. -(BEDT-TTF)/sub 2/I/sub 3/). United States. doi:10.1103/PhysRevB.33.2046.
Stewart, G R, O'Rourke, J, Crabtree, G W, Carlson, K D, Wang, H H, Williams, J M, Gross, F, and Andres, K. Sat . "Specific heat of the ambient-pressure organic superconductor. beta. -di(bis(ethylenedithio)tetrathiafulvalene) triiodide (. beta. -(BEDT-TTF)/sub 2/I/sub 3/)". United States. doi:10.1103/PhysRevB.33.2046.
@article{osti_6438955,
title = {Specific heat of the ambient-pressure organic superconductor. beta. -di(bis(ethylenedithio)tetrathiafulvalene) triiodide (. beta. -(BEDT-TTF)/sub 2/I/sub 3/)},
author = {Stewart, G R and O'Rourke, J and Crabtree, G W and Carlson, K D and Wang, H H and Williams, J M and Gross, F and Andres, K},
abstractNote = {We have measured the specific heat of single crystals of the ambient-pressure superconductor ..beta..-(BEDT-TTF)/sub 2/I/sub 3/, abbreviated ..beta..-(ET)/sub 2/I/sub 3/, from 0.7 to 18 K in zero and applied magnetic fields. No bulk specific-heat anomaly in the vicinity of T/sub c/ was observed, although Meissner-effect measurements (Hparallelc() performed on these same crystals yield a volume percent superconductivity of at least 25% at 0.8 K. We find a ..gamma.. = 24 +- 3 mJ/mol K/sup 2/, which is larger than the value for the only previously known ambient-pressure superconductor, the Se-based (TMTSF)/sub 2/ClO/sub 4/ (TMTSF denotes tetramethyltetraselenafulvalene). This difference is due primarily to the greater density of S atoms in ..beta..-(ET)/sub 2/I/sub 3/ compared to the density of Se atoms in (TMTSF)/sub 2/ClO/sub 4/. The response of the low-temperature specific heat to fields up to 10 T aligned along c( was 0 to +- 3%, in sharp contrast to previous reports of a 20% increase in the specific heat of (TMTSF)/sub 2/ClO/sub 4/ in a field of 2 T. No evidence for a high-field magnetic or insulating state similar to that observed in (TMTSF)/sub 2/ClO/sub 4/ was found for ..beta..-(ET)/sub 2/I/sub 3/. New results on the specific heat in applied fields for (TMTSF)/sub 2/ClO/sub 4/ are presented.},
doi = {10.1103/PhysRevB.33.2046},
journal = {Phys. Rev. B: Condens. Matter; (United States)},
number = ,
volume = 33:3,
place = {United States},
year = {1986},
month = {2}
}