Soft striped magnetic fluctuations competing with superconductivity in Fe1+xTe

C. Stock; E. E. Rodriguez; O. Sobolev; J. A. Rodriguez-Rivera; R. A. Ewings; J. W. Taylor; A. D. Christianson; M. A. Green

doi:10.1103/PhysRevB.90.121113

Soft striped magnetic fluctuations competing with superconductivity in Fe1+xTe

C. Stock
, E. E. Rodriguez
, O. Sobolev
, J. A. Rodriguez-Rivera
, R. A. Ewings
, J. W. Taylor
, A. D. Christianson
, M. A. Green

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

27 Scopus citations

Abstract

Neutron spectroscopy is used to investigate the magnetic fluctuations in Fe1+xTe - a parent compound of chalcogenide superconductors. Incommensurate "stripelike" excitations soften with increased interstitial iron concentration. The energy crossover from incommensurate to stripy fluctuations defines an apparent hourglass dispersion. Application of sum rules of neutron scattering find that the integrated intensity is inconsistent with an S=1Fe2+ ground state and significantly less than S=2 predicted from weak crystal field arguments pointing towards the Fe2+ being in a superposition of orbital states. The results suggest that a highly anisotropic order competes with superconductivity in chalcogenide systems.

Original language	English
Article number	121113
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	90
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.90.121113
State	Published - Sep 30 2014

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10.1103/PhysRevB.90.121113

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title = "Soft striped magnetic fluctuations competing with superconductivity in Fe1+xTe",

abstract = "Neutron spectroscopy is used to investigate the magnetic fluctuations in Fe1+xTe - a parent compound of chalcogenide superconductors. Incommensurate {"}stripelike{"} excitations soften with increased interstitial iron concentration. The energy crossover from incommensurate to stripy fluctuations defines an apparent hourglass dispersion. Application of sum rules of neutron scattering find that the integrated intensity is inconsistent with an S=1Fe2+ ground state and significantly less than S=2 predicted from weak crystal field arguments pointing towards the Fe2+ being in a superposition of orbital states. The results suggest that a highly anisotropic order competes with superconductivity in chalcogenide systems.",

author = "C. Stock and Rodriguez, \{E. E.\} and O. Sobolev and Rodriguez-Rivera, \{J. A.\} and Ewings, \{R. A.\} and Taylor, \{J. W.\} and Christianson, \{A. D.\} and Green, \{M. A.\}",

note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",

year = "2014",

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doi = "10.1103/PhysRevB.90.121113",

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T1 - Soft striped magnetic fluctuations competing with superconductivity in Fe1+xTe

AU - Stock, C.

AU - Rodriguez, E. E.

AU - Sobolev, O.

AU - Rodriguez-Rivera, J. A.

AU - Ewings, R. A.

AU - Taylor, J. W.

AU - Christianson, A. D.

AU - Green, M. A.

PY - 2014/9/30

Y1 - 2014/9/30

N2 - Neutron spectroscopy is used to investigate the magnetic fluctuations in Fe1+xTe - a parent compound of chalcogenide superconductors. Incommensurate "stripelike" excitations soften with increased interstitial iron concentration. The energy crossover from incommensurate to stripy fluctuations defines an apparent hourglass dispersion. Application of sum rules of neutron scattering find that the integrated intensity is inconsistent with an S=1Fe2+ ground state and significantly less than S=2 predicted from weak crystal field arguments pointing towards the Fe2+ being in a superposition of orbital states. The results suggest that a highly anisotropic order competes with superconductivity in chalcogenide systems.

AB - Neutron spectroscopy is used to investigate the magnetic fluctuations in Fe1+xTe - a parent compound of chalcogenide superconductors. Incommensurate "stripelike" excitations soften with increased interstitial iron concentration. The energy crossover from incommensurate to stripy fluctuations defines an apparent hourglass dispersion. Application of sum rules of neutron scattering find that the integrated intensity is inconsistent with an S=1Fe2+ ground state and significantly less than S=2 predicted from weak crystal field arguments pointing towards the Fe2+ being in a superposition of orbital states. The results suggest that a highly anisotropic order competes with superconductivity in chalcogenide systems.

UR - https://www.scopus.com/pages/publications/84907452407

U2 - 10.1103/PhysRevB.90.121113

DO - 10.1103/PhysRevB.90.121113

M3 - Article

AN - SCOPUS:84907452407

SN - 1098-0121

VL - 90

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 12

M1 - 121113

ER -

Soft striped magnetic fluctuations competing with superconductivity in Fe1+xTe

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