A Triplet Resonance in Superconducting Fe1.03Se0.4Te0.6

Juanjuan Liu; A. T. Savici; G. E. Granroth; K. Habicht; Y. Qiu; Jin Hu; Z. Q. Mao; Wei Bao

doi:10.1088/0256-307X/35/12/127401

A Triplet Resonance in Superconducting Fe_1.03Se_0.4Te_0.6

Juanjuan Liu, A. T. Savici, G. E. Granroth, K. Habicht, Y. Qiu, Jin Hu, Z. Q. Mao, Wei Bao

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Abstract

From heavy fermion compounds and cuprates to iron pnictides and chalcogenides, a spin resonance at ω0 ∝ κBTc is a staple of nearly magnetic superconductors. Possible explanations include a two-particle bound state or loss of magnon damping in the superconducting state. While both scenarios suggest a central role for magnetic fluctuations, distinguishing them is important to identify the right theoretical framework to understand these types of unconventional superconductors. Using an inelastic neutron scattering technique, we show that the spin resonance in the optimally doped Fe_1.03Se_0.4Te_0.6 superconductor splits into three peaks in a high magnetic field, a signature of a two-particle S = 1 triplet bound state.

Original language	English
Article number	127401
Journal	Chinese Physics Letters
Volume	35
Issue number	12
DOIs	https://doi.org/10.1088/0256-307X/35/12/127401
State	Published - Dec 2018

Funding

Supported by the National Basic Research Program of China under Grant Nos 2012CB921700 and 2011CBA00112, the National Natural Science Foundation of China under Grant Nos 11034012 and 11190024, the National Science Foundation under Grant No DMR-0645305, the US DOE under Grant No DE-FG02-07ER46358, and the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Grant No DE-AC05-00OR22725. \u2217Supported by the National Basic Research Program of China under Grant Nos 2012CB921700 and 2011CBA00112, the National Natural Science Foundation of China under Grant Nos 11034012 and 11190024, the National Science Foundation under Grant No DMR-0645305, the US DOE under Grant No DE-FG02-07ER46358, and the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Grant No DE-AC05-00OR22725. **Corresponding author. Email: [email protected] \u00A9 2018 Chinese Physical Society and IOP Publishing Ltd

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title = "A Triplet Resonance in Superconducting Fe1.03Se0.4Te0.6",

abstract = "From heavy fermion compounds and cuprates to iron pnictides and chalcogenides, a spin resonance at ω0 ∝ κBTc is a staple of nearly magnetic superconductors. Possible explanations include a two-particle bound state or loss of magnon damping in the superconducting state. While both scenarios suggest a central role for magnetic fluctuations, distinguishing them is important to identify the right theoretical framework to understand these types of unconventional superconductors. Using an inelastic neutron scattering technique, we show that the spin resonance in the optimally doped Fe1.03Se0.4Te0.6 superconductor splits into three peaks in a high magnetic field, a signature of a two-particle S = 1 triplet bound state.",

author = "Juanjuan Liu and Savici, {A. T.} and Granroth, {G. E.} and K. Habicht and Y. Qiu and Jin Hu and Mao, {Z. Q.} and Wei Bao",

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AU - Liu, Juanjuan

AU - Savici, A. T.

AU - Granroth, G. E.

AU - Habicht, K.

AU - Qiu, Y.

AU - Hu, Jin

AU - Mao, Z. Q.

AU - Bao, Wei

PY - 2018/12

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AB - From heavy fermion compounds and cuprates to iron pnictides and chalcogenides, a spin resonance at ω0 ∝ κBTc is a staple of nearly magnetic superconductors. Possible explanations include a two-particle bound state or loss of magnon damping in the superconducting state. While both scenarios suggest a central role for magnetic fluctuations, distinguishing them is important to identify the right theoretical framework to understand these types of unconventional superconductors. Using an inelastic neutron scattering technique, we show that the spin resonance in the optimally doped Fe1.03Se0.4Te0.6 superconductor splits into three peaks in a high magnetic field, a signature of a two-particle S = 1 triplet bound state.

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A Triplet Resonance in Superconducting Fe_1.03Se_0.4Te_0.6

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