Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi2 Se2

N. Xu; C. E. Matt; P. Richard; A. Van Roekeghem; S. Biermann; X. Shi; S. F. Wu; H. W. Liu; D. Chen; T. Qian; N. C. Plumb; M. Radović; Hangdong Wang; Qianhui Mao; Jianhua Du; Minghu Fang; J. Mesot; H. Ding; M. Shi

doi:10.1103/PhysRevB.92.081116

Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi2 Se2

N. Xu, C. E. Matt, P. Richard, A. Van Roekeghem, S. Biermann, X. Shi, S. F. Wu, H. W. Liu, D. Chen, T. Qian, N. C. Plumb, M. Radović, Hangdong Wang, Qianhui Mao, Jianhua Du, Minghu Fang, J. Mesot, H. Ding, M. Shi

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13 Citations (Scopus)

Abstract

Combining photoemission spectroscopy, Raman spectroscopy, and first-principles calculations, we characterize superconducting TlNi₂Se₂ as a material with weak electronic Coulomb correlations leading to a bandwidth renormalization of 1.4. We identify a camelback-shaped band, whose energetic position strongly depends on the selenium height. While this feature is universal in transition metal pnictides, in TlNi2Se2 it lies in the immediate vicinity of the Fermi level, giving rise to a pronounced van Hove singularity. The resulting heavy band mass resolves the apparent puzzle of a large normal-state Sommerfeld coefficient [H. Wang, Phys. Rev. Lett 111, 207001 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.207001] in this weakly correlated compound.

Original language	English
Article number	081116
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevB.92.081116
Publication status	Published - 24 Aug 2015
Externally published	Yes

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Xu, N., Matt, C. E., Richard, P., Van Roekeghem, A., Biermann, S., Shi, X., Wu, S. F., Liu, H. W., Chen, D., Qian, T., Plumb, N. C., Radović, M., Wang, H., Mao, Q., Du, J., Fang, M., Mesot, J., Ding, H., & Shi, M. (2015). Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi2 Se2. Physical Review B - Condensed Matter and Materials Physics, 92(8), Article 081116. https://doi.org/10.1103/PhysRevB.92.081116

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title = "Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi2 Se2",

abstract = "Combining photoemission spectroscopy, Raman spectroscopy, and first-principles calculations, we characterize superconducting TlNi2Se2 as a material with weak electronic Coulomb correlations leading to a bandwidth renormalization of 1.4. We identify a camelback-shaped band, whose energetic position strongly depends on the selenium height. While this feature is universal in transition metal pnictides, in TlNi2Se2 it lies in the immediate vicinity of the Fermi level, giving rise to a pronounced van Hove singularity. The resulting heavy band mass resolves the apparent puzzle of a large normal-state Sommerfeld coefficient [H. Wang, Phys. Rev. Lett 111, 207001 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.207001] in this weakly correlated compound.",

author = "N. Xu and Matt, {C. E.} and P. Richard and {Van Roekeghem}, A. and S. Biermann and X. Shi and Wu, {S. F.} and Liu, {H. W.} and D. Chen and T. Qian and Plumb, {N. C.} and M. Radovi{\'c} and Hangdong Wang and Qianhui Mao and Jianhua Du and Minghu Fang and J. Mesot and H. Ding and M. Shi",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

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doi = "10.1103/PhysRevB.92.081116",

language = "English",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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Xu, N, Matt, CE, Richard, P, Van Roekeghem, A, Biermann, S, Shi, X, Wu, SF, Liu, HW, Chen, D, Qian, T, Plumb, NC, Radović, M, Wang, H, Mao, Q, Du, J, Fang, M, Mesot, J, Ding, H & Shi, M 2015, 'Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi2 Se2', Physical Review B - Condensed Matter and Materials Physics, vol. 92, no. 8, 081116. https://doi.org/10.1103/PhysRevB.92.081116

TY - JOUR

T1 - Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi2 Se2

AU - Xu, N.

AU - Matt, C. E.

AU - Richard, P.

AU - Van Roekeghem, A.

AU - Biermann, S.

AU - Shi, X.

AU - Wu, S. F.

AU - Liu, H. W.

AU - Chen, D.

AU - Qian, T.

AU - Plumb, N. C.

AU - Radović, M.

AU - Wang, Hangdong

AU - Mao, Qianhui

AU - Du, Jianhua

AU - Fang, Minghu

AU - Mesot, J.

AU - Ding, H.

AU - Shi, M.

PY - 2015/8/24

Y1 - 2015/8/24

N2 - Combining photoemission spectroscopy, Raman spectroscopy, and first-principles calculations, we characterize superconducting TlNi2Se2 as a material with weak electronic Coulomb correlations leading to a bandwidth renormalization of 1.4. We identify a camelback-shaped band, whose energetic position strongly depends on the selenium height. While this feature is universal in transition metal pnictides, in TlNi2Se2 it lies in the immediate vicinity of the Fermi level, giving rise to a pronounced van Hove singularity. The resulting heavy band mass resolves the apparent puzzle of a large normal-state Sommerfeld coefficient [H. Wang, Phys. Rev. Lett 111, 207001 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.207001] in this weakly correlated compound.

AB - Combining photoemission spectroscopy, Raman spectroscopy, and first-principles calculations, we characterize superconducting TlNi2Se2 as a material with weak electronic Coulomb correlations leading to a bandwidth renormalization of 1.4. We identify a camelback-shaped band, whose energetic position strongly depends on the selenium height. While this feature is universal in transition metal pnictides, in TlNi2Se2 it lies in the immediate vicinity of the Fermi level, giving rise to a pronounced van Hove singularity. The resulting heavy band mass resolves the apparent puzzle of a large normal-state Sommerfeld coefficient [H. Wang, Phys. Rev. Lett 111, 207001 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.207001] in this weakly correlated compound.

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DO - 10.1103/PhysRevB.92.081116

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SN - 1098-0121

VL - 92

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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ER -

Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi2 Se2

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