Electronic correlations and unconventional spectral weight transfer in the high-temperature pnictide BaFe 2-xCo xAs 2 superconductor using infrared spectroscopy

A. A. Schafgans; S. J. Moon; B. C. Pursley; A. D. Laforge; M. M. Qazilbash; A. S. Sefat; D. Mandrus; K. Haule; G. Kotliar; D. N. Basov

doi:10.1103/PhysRevLett.108.147002

Electronic correlations and unconventional spectral weight transfer in the high-temperature pnictide BaFe _2-xCo _xAs ₂ superconductor using infrared spectroscopy

A. A. Schafgans, S. J. Moon, B. C. Pursley, A. D. Laforge, M. M. Qazilbash, A. S. Sefat, D. Mandrus, K. Haule, G. Kotliar, D. N. Basov

School of Arts and Sciences, New High Energy Theory Center

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

70 Scopus citations

Abstract

We report an infrared optical study of the pnictide high-temperature superconductor BaFe _1.84Co _0.16As ₂ and its parent compound BaFe ₂As ₂. We demonstrate that electronic correlations are moderately strong and do not change across the spin-density wave transition or with doping. By examining the energy scale and direction of spectral weight transfer, we argue that Hund's coupling J is the primary mechanism that gives rise to correlations.

Original language	English (US)
Article number	147002
Journal	Physical review letters
Volume	108
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.108.147002
State	Published - Apr 2 2012

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.108.147002

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Schafgans, A. A., Moon, S. J., Pursley, B. C., Laforge, A. D., Qazilbash, M. M., Sefat, A. S., Mandrus, D., Haule, K., Kotliar, G., & Basov, D. N. (2012). Electronic correlations and unconventional spectral weight transfer in the high-temperature pnictide BaFe _2-xCo _xAs ₂ superconductor using infrared spectroscopy. Physical review letters, 108(14), Article 147002. https://doi.org/10.1103/PhysRevLett.108.147002

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abstract = "We report an infrared optical study of the pnictide high-temperature superconductor BaFe 1.84Co 0.16As 2 and its parent compound BaFe 2As 2. We demonstrate that electronic correlations are moderately strong and do not change across the spin-density wave transition or with doping. By examining the energy scale and direction of spectral weight transfer, we argue that Hund's coupling J is the primary mechanism that gives rise to correlations.",

author = "Schafgans, {A. A.} and Moon, {S. J.} and Pursley, {B. C.} and Laforge, {A. D.} and Qazilbash, {M. M.} and Sefat, {A. S.} and D. Mandrus and K. Haule and G. Kotliar and Basov, {D. N.}",

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Schafgans, AA, Moon, SJ, Pursley, BC, Laforge, AD, Qazilbash, MM, Sefat, AS, Mandrus, D, Haule, K , Kotliar, G & Basov, DN 2012, 'Electronic correlations and unconventional spectral weight transfer in the high-temperature pnictide BaFe _2-xCo _xAs ₂ superconductor using infrared spectroscopy', Physical review letters, vol. 108, no. 14, 147002. https://doi.org/10.1103/PhysRevLett.108.147002

TY - JOUR

T1 - Electronic correlations and unconventional spectral weight transfer in the high-temperature pnictide BaFe 2-xCo xAs 2 superconductor using infrared spectroscopy

AU - Schafgans, A. A.

AU - Moon, S. J.

AU - Pursley, B. C.

AU - Laforge, A. D.

AU - Qazilbash, M. M.

AU - Sefat, A. S.

AU - Mandrus, D.

AU - Haule, K.

AU - Kotliar, G.

AU - Basov, D. N.

PY - 2012/4/2

Y1 - 2012/4/2

N2 - We report an infrared optical study of the pnictide high-temperature superconductor BaFe 1.84Co 0.16As 2 and its parent compound BaFe 2As 2. We demonstrate that electronic correlations are moderately strong and do not change across the spin-density wave transition or with doping. By examining the energy scale and direction of spectral weight transfer, we argue that Hund's coupling J is the primary mechanism that gives rise to correlations.

AB - We report an infrared optical study of the pnictide high-temperature superconductor BaFe 1.84Co 0.16As 2 and its parent compound BaFe 2As 2. We demonstrate that electronic correlations are moderately strong and do not change across the spin-density wave transition or with doping. By examining the energy scale and direction of spectral weight transfer, we argue that Hund's coupling J is the primary mechanism that gives rise to correlations.

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ER -

Electronic correlations and unconventional spectral weight transfer in the high-temperature pnictide BaFe _2-xCo _xAs ₂ superconductor using infrared spectroscopy

Abstract

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