Soft striped magnetic fluctuations competing with superconductivity in Fe1+x Te

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+x Te

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

^*Corresponding author for this work

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

Abstract

Neutron spectroscopy is used to investigate the magnetic fluctuations in Fe1+x Te-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 = 1 Fe2+ 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
Number of pages	6
Journal	Physical review B
Volume	90
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.90.121113
Publication status	Published - 30 Sept 2014

Keywords / Materials (for Non-textual outputs)

HIGH-TEMPERATURE SUPERCONDUCTIVITY
SPIN SUSCEPTIBILITY
IRON PNICTIDES
EXCITATIONS
CHALCOGENIDES
EVOLUTION
WAVES

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10.1103/PhysRevB.90.121113

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

abstract = "Neutron spectroscopy is used to investigate the magnetic fluctuations in Fe1+x Te-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 = 1 Fe2+ 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.",

keywords = "HIGH-TEMPERATURE SUPERCONDUCTIVITY, SPIN SUSCEPTIBILITY, IRON PNICTIDES, EXCITATIONS, CHALCOGENIDES, EVOLUTION, WAVES",

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.}",

year = "2014",

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day = "30",

doi = "10.1103/PhysRevB.90.121113",

language = "English",

volume = "90",

journal = "Physical review B",

issn = "1098-0121",

publisher = "American Physical Society",

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

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+x Te-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 = 1 Fe2+ 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+x Te-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 = 1 Fe2+ 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.

KW - HIGH-TEMPERATURE SUPERCONDUCTIVITY

KW - SPIN SUSCEPTIBILITY

KW - IRON PNICTIDES

KW - EXCITATIONS

KW - CHALCOGENIDES

KW - EVOLUTION

KW - WAVES

U2 - 10.1103/PhysRevB.90.121113

DO - 10.1103/PhysRevB.90.121113

M3 - Article

SN - 1098-0121

VL - 90

JO - Physical review B

JF - Physical review B

IS - 12

M1 - 121113

ER -

Soft striped magnetic fluctuations competing with superconductivity in Fe1+x Te

Abstract

Keywords / Materials (for Non-textual outputs)

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