Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting ${\mathrm{TlNi}}_{2}{\mathrm{Se}}_{2}$

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Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting ${TlNi}_{2} {Se}_{2}$

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, and M. Shi

Phys. Rev. B 92, 081116(R) – Published 24 August 2015

Abstract

Combining photoemission spectroscopy, Raman spectroscopy, and first-principles calculations, we characterize superconducting ${TlNi}_{2} {Se}_{2}$ 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 ${TlNi}_{2} {Se}_{2}$ 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 et al., Phys. Rev. Lett 111, 207001 (2013)] in this weakly correlated compound.

Received 22 December 2014

DOI:https://doi.org/10.1103/PhysRevB.92.081116

Authors & Affiliations

N. Xu^1,2,*, C. E. Matt^1,3, P. Richard^4,5, A. van Roekeghem^4,6, S. Biermann^6,7,8, X. Shi^1,4, S.-F. Wu⁴, H. W. Liu⁴, D. Chen⁴, T. Qian⁴, N. C. Plumb¹, M. Radović^1,9, Hangdong Wang¹⁰, Qianhui Mao¹⁰, Jianhua Du¹⁰, Minghu Fang^10,11, J. Mesot^1,2,3, H. Ding^4,5, and M. Shi^1,†

¹Swiss Light Source, Paul Scherrer Insitut, CH-5232 Villigen PSI, Switzerland
²Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
³Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland
⁴Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
⁵Collaborative Innovation Center of Quantum Matter, Beijing, China
⁶Centre de Physique Théorique, Ecole Polytechnique, CNRS-UMR7644, 91128 Palaiseau, France
⁷Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France
⁸Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA
⁹SwissFEL, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
¹⁰Department of Physics, Zhejiang University, Hangzhou 310027, China
¹¹Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

^*nan.xu@psi.ch
^†ming.shi@psi.ch

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Vol. 92, Iss. 8 — 15 August 2015

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Physical Review B

covering condensed matter and materials physics

Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting ${TlNi}_{2} {Se}_{2}$

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, and M. Shi

Phys. Rev. B 92, 081116(R) – Published 24 August 2015

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Physical Review B

covering condensed matter and materials physics

Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi2Se2

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, and M. Shi

Phys. Rev. B 92, 081116(R) – Published 24 August 2015

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Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting ${TlNi}_{2} {Se}_{2}$