Vibrating reed study of the flux line dynamics of κ-(ET)2Cu[N(CN)2]Br

Ulrike G. Lehmann; Lance E. De Long; Hau H. Wang; K. Douglas Carlson; Jack M. Williams

doi:10.1007/BF01320871

Vibrating reed study of the flux line dynamics of κ-(ET)₂Cu[N(CN)₂]Br

Ulrike G. Lehmann, Lance E. De Long, Hau H. Wang, K. Douglas Carlson, Jack M. Williams

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

Vibrating reed measurements were performed on single-crystal samples of κ-(ET)₂- Cu[N(CN)₂]Br in an applied magnetic field H oriented either parallel ("longitudinal") or perpendicular ("transverse") to the highly conducting ac-plane. Field-cooling data taken for the longitudinal orientation and H<0.7 T revealed a peak with a low-temperature shoulder in the reed dissipation 1/Q located at temperature T_Q below the superconducting transition temperature T_c(≈11.6 for H=0). The shoulder disappeared near H≈0.7 T, accompanied by an abrupt change in the slope of T_Q(H), corresponding to a similar change in the slope of the upper critical magnetic field H_c2 measured by Kwok et al. The existence of the shoulder in the dissipation peak bears on a number of current explanations for the exotic superconducting properties of κ-(ET)₂Cu[N(CN)₂]Br. T_Q data taken for the transverse orientation fell far below estimates of H_c2., indicating the existence of a substantial region of flux line (FL) mobility below H_c2(T). The location of a peak in NMR relaxation observed by De Soto et al. lies close to T_Q for the transverse orientation.

Original language	English
Pages (from-to)	793-797
Number of pages	5
Journal	Journal of Superconductivity
Volume	7
Issue number	5
DOIs	https://doi.org/10.1007/BF01320871
State	Published - Oct 1994

Keywords

Vibrating reed
flux pinning
organic superconductors
type-II superconductors
vortex lattice melting

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Physics and Astronomy (miscellaneous)

Access to Document

10.1007/BF01320871

Cite this

@article{e11e9ba92d8a4fe281411d7ef1a6075a,

title = "Vibrating reed study of the flux line dynamics of κ-(ET)2Cu[N(CN)2]Br",

abstract = "Vibrating reed measurements were performed on single-crystal samples of κ-(ET)2- Cu[N(CN)2]Br in an applied magnetic field H oriented either parallel ({"}longitudinal{"}) or perpendicular ({"}transverse{"}) to the highly conducting ac-plane. Field-cooling data taken for the longitudinal orientation and H<0.7 T revealed a peak with a low-temperature shoulder in the reed dissipation 1/Q located at temperature TQ below the superconducting transition temperature Tc(≈11.6 for H=0). The shoulder disappeared near H≈0.7 T, accompanied by an abrupt change in the slope of TQ(H), corresponding to a similar change in the slope of the upper critical magnetic field Hc2 measured by Kwok et al. The existence of the shoulder in the dissipation peak bears on a number of current explanations for the exotic superconducting properties of κ-(ET)2Cu[N(CN)2]Br. TQ data taken for the transverse orientation fell far below estimates of Hc2., indicating the existence of a substantial region of flux line (FL) mobility below Hc2(T). The location of a peak in NMR relaxation observed by De Soto et al. lies close to TQ for the transverse orientation.",

keywords = "Vibrating reed, flux pinning, organic superconductors, type-II superconductors, vortex lattice melting",

author = "Lehmann, {Ulrike G.} and {De Long}, {Lance E.} and Wang, {Hau H.} and {Douglas Carlson}, K. and Williams, {Jack M.}",

year = "1994",

month = oct,

doi = "10.1007/BF01320871",

language = "English",

volume = "7",

pages = "793--797",

number = "5",

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T1 - Vibrating reed study of the flux line dynamics of κ-(ET)2Cu[N(CN)2]Br

AU - Lehmann, Ulrike G.

AU - De Long, Lance E.

AU - Wang, Hau H.

AU - Douglas Carlson, K.

AU - Williams, Jack M.

PY - 1994/10

Y1 - 1994/10

N2 - Vibrating reed measurements were performed on single-crystal samples of κ-(ET)2- Cu[N(CN)2]Br in an applied magnetic field H oriented either parallel ("longitudinal") or perpendicular ("transverse") to the highly conducting ac-plane. Field-cooling data taken for the longitudinal orientation and H<0.7 T revealed a peak with a low-temperature shoulder in the reed dissipation 1/Q located at temperature TQ below the superconducting transition temperature Tc(≈11.6 for H=0). The shoulder disappeared near H≈0.7 T, accompanied by an abrupt change in the slope of TQ(H), corresponding to a similar change in the slope of the upper critical magnetic field Hc2 measured by Kwok et al. The existence of the shoulder in the dissipation peak bears on a number of current explanations for the exotic superconducting properties of κ-(ET)2Cu[N(CN)2]Br. TQ data taken for the transverse orientation fell far below estimates of Hc2., indicating the existence of a substantial region of flux line (FL) mobility below Hc2(T). The location of a peak in NMR relaxation observed by De Soto et al. lies close to TQ for the transverse orientation.

AB - Vibrating reed measurements were performed on single-crystal samples of κ-(ET)2- Cu[N(CN)2]Br in an applied magnetic field H oriented either parallel ("longitudinal") or perpendicular ("transverse") to the highly conducting ac-plane. Field-cooling data taken for the longitudinal orientation and H<0.7 T revealed a peak with a low-temperature shoulder in the reed dissipation 1/Q located at temperature TQ below the superconducting transition temperature Tc(≈11.6 for H=0). The shoulder disappeared near H≈0.7 T, accompanied by an abrupt change in the slope of TQ(H), corresponding to a similar change in the slope of the upper critical magnetic field Hc2 measured by Kwok et al. The existence of the shoulder in the dissipation peak bears on a number of current explanations for the exotic superconducting properties of κ-(ET)2Cu[N(CN)2]Br. TQ data taken for the transverse orientation fell far below estimates of Hc2., indicating the existence of a substantial region of flux line (FL) mobility below Hc2(T). The location of a peak in NMR relaxation observed by De Soto et al. lies close to TQ for the transverse orientation.

KW - Vibrating reed

KW - flux pinning

KW - organic superconductors

KW - type-II superconductors

KW - vortex lattice melting

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