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Title: {beta}"-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} - a layered 2D metal with vanishing interlayer coupling.

Abstract

We report on electrical transport and magnetization measurements of the quasi-two-dimensional layered superconductor {beta}{double_prime}-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}. The absence of a resistive peak when a strong magnetic field is aligned along the conducting planes reflects the fact that the material is one of the most anisotropic ET-based metals with possible incoherent interlayer transport. Consequences of this feature may be the enhanced amplitude of magnetic quantum oscillations in the superconducting state and an unusual angular dependent metal-insulator transition.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
963854
Report Number(s):
ANL/MSD/CP-116383
TRN: US200918%%174
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Journal Name: J. Low Temp. Phys.; Journal Volume: 142; Journal Issue: 3-4 ; Feb. 2006; Conference: 6th International Symposium on Crystalline Organic Metals, Supercoductors, and Ferromagnets; Sep. 11, 2005 - Sep. 16, 2005; Key West. FL
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ORGANIC SUPERCONDUCTORS; ORGANIC SULFUR COMPOUNDS; ORGANIC FLUORINE COMPOUNDS; MAGNETIZATION; ELECTRON TRANSFER

Citation Formats

Wosnitza, J., Hagel, J., Ignatchik, O., Bergk, B., Gvozdikov, V. M., Schlueter, J. A., Winter, R. W., Gard, G. L., Materials Science Division, Hochfeld-Magnetlabor Dresden, Inst. fur Festkorperphysik, Kharkov National Univ., and Portland State Univ. {beta}"-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} - a layered 2D metal with vanishing interlayer coupling.. United States: N. p., 2006. Web. doi:10.1007/BF02679517.
Wosnitza, J., Hagel, J., Ignatchik, O., Bergk, B., Gvozdikov, V. M., Schlueter, J. A., Winter, R. W., Gard, G. L., Materials Science Division, Hochfeld-Magnetlabor Dresden, Inst. fur Festkorperphysik, Kharkov National Univ., & Portland State Univ. {beta}"-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} - a layered 2D metal with vanishing interlayer coupling.. United States. doi:10.1007/BF02679517.
Wosnitza, J., Hagel, J., Ignatchik, O., Bergk, B., Gvozdikov, V. M., Schlueter, J. A., Winter, R. W., Gard, G. L., Materials Science Division, Hochfeld-Magnetlabor Dresden, Inst. fur Festkorperphysik, Kharkov National Univ., and Portland State Univ. Wed . "{beta}"-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} - a layered 2D metal with vanishing interlayer coupling.". United States. doi:10.1007/BF02679517.
@article{osti_963854,
title = {{beta}"-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} - a layered 2D metal with vanishing interlayer coupling.},
author = {Wosnitza, J. and Hagel, J. and Ignatchik, O. and Bergk, B. and Gvozdikov, V. M. and Schlueter, J. A. and Winter, R. W. and Gard, G. L. and Materials Science Division and Hochfeld-Magnetlabor Dresden and Inst. fur Festkorperphysik and Kharkov National Univ. and Portland State Univ.},
abstractNote = {We report on electrical transport and magnetization measurements of the quasi-two-dimensional layered superconductor {beta}{double_prime}-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}. The absence of a resistive peak when a strong magnetic field is aligned along the conducting planes reflects the fact that the material is one of the most anisotropic ET-based metals with possible incoherent interlayer transport. Consequences of this feature may be the enhanced amplitude of magnetic quantum oscillations in the superconducting state and an unusual angular dependent metal-insulator transition.},
doi = {10.1007/BF02679517},
journal = {J. Low Temp. Phys.},
number = 3-4 ; Feb. 2006,
volume = 142,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}

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  • We report the polarized infrared and optical reflectance of {beta}{sup {double_prime}}-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} as a function of temperature. This fully organic superconductor displays weakly metallic behavior over the entire temperature range of our investigation. The electronic properties present several unusual features including the lack of a conventional free carrier (Drude) response at low temperature, infrared localization phenomena, and an unexpected temperature dependence of the oscillator strength. Similar behavior is observed in other {beta} and {beta}{sup {double_prime}} superconductors above T{sub c}, suggesting that this class of compounds is very close to a metal {r_arrow} insulator transition where electronicmore » correlations are important and the Drude response carries very little spectral weight. Vibronic features increase in intensity with decreasing temperature in the infrared, as expected. The temperature dependence of key anion vibrational modes are discussed in terms of intermolecular hydrogen bonding within the anion pocket. thinsp thinsp {copyright} {ital 1999} {ital The American Physical Society}« less
  • We report the polarized infrared and optical reflectance of {beta}'-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} as a function of temperature. This fully organic superconductor displays weakly metallic behavior over the entire temperature range of our investigation. The electronic properties present several unusual features including the lack of a conventional free carrier (Drude) response at low temperature, infrared localization phenomena, and an unexpected temperature dependence of the oscillator strength. Similar behavior is observed in other {beta} and {beta}' superconductors above T{sub c}, suggesting that this class of compounds is very close to a metal {yields} insulator transition where electronic correlations aremore » important and the Drude response carries very little spectral weight. Vibronic features increase in intensity with decreasing temperature in the infrared, as expected. The temperature dependence of key anion vibrational modes are discussed in terms of intermolecular hydrogen bonding within the anion pocket.« less
  • The optical spectra of the organic superconductor {beta}{double_prime}-(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3} are measured over a wide spectral range (30-35000 cm{sup {minus}1}) as a function of temperature and polarization. The optical anisotropy is quite large compared with other ET-based organic superconductors, and the spectra are far from Drude-like over the full temperature range. A broad electronic band centered near 1000 cm{sup {minus}1} is observed at low temperature along the a axis, prior to the superconducting transition. The changes of vibrational features near 120 K are attributed to a weak reorientation of the counterion, which may affect hydrogen bonding inmore » the material.« less
  • We present a detailed Fermi-surface (FS) investigation of the quasi two-dimensional (2D) organic superconductor (T{sub c} {approx} 4.5 K) {beta}{double_prime}(ET){sub 2}SF{sub 5}CH{sub 2}CF{sub 2}SO{sub 3}. In line with previous investigations, de Haas-van Alphen measurements in pulsed fields up to 60 T show a single oscillation frequency, F{sub 0} = 200 T, which corresponds to a FS size of about 5% of the first Brillouin zone. Angular dependent magnetoresistance oscillations (AMROs) are utilized for the exact determination of the in-plane FS, which is found to be a strongly elongated ellipsoid with an axes ratio of about 1:9. Transport measurements in staticmore » fields up to 33 T show an unusual temperature dependence of the Shubnikov-de Haas (SdH) signal, i.e., a decrease of the SdH amplitude with decreasing temperature.« less