Spin-Canting-Induced Band Reconstruction in the Dirac Material Ca1–xNaxMnBi2

Yang, R.; Corasaniti, M.; Le, C. C.; Liao, Z. Y.; Wang, A. F.; Du, Q.; Petrovic, C.; Qiu, X. G.; Hu, J. P.; Degiorgi, L.

doi:10.1103/PhysRevLett.124.137201

Title: Spin-Canting-Induced Band Reconstruction in the Dirac Material ${Ca}_{1 - x} {Na}_{x} {MnBi}_{2}$

Journal Article · 30 March 2020 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.124.137201 · OSTI ID:1633595

Yang, R. ^[1]; Corasaniti, M. ^[1]; Le, C. C. ^[2]; Liao, Z. Y. ^[3]; Wang, A. F. ^[4];

^[5]; Petrovic, C. ^[5];

^[6]; Hu, J. P. ^[7];

^[1]

ETH Zurich (Switzerland)
Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
Beijing National Laboratory for Condensed Matter Physics (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Brookhaven National Lab. (BNL), Upton, NY (United States); Chongqing Univ. (China)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Beijing National Laboratory for Condensed Matter Physics (China); Univ. of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Dongguan, GD (China)
Beijing National Laboratory for Condensed Matter Physics (China); Univ. of Chinese Academy of Sciences, Beijing (China); South Bay Interdisciplinary Science Center, Dongguan, GD (China)

The ternary AMnBi₂ (A is alkaline as well as rare-earth atom) materials provide an arena for investigating the interplay between low-dimensional magnetism of the antiferromagnetic MnBi layers and the electronic states in the intercalated Bi layers, which harbor relativistic fermions. We report on a comprehensive study of the optical properties and magnetic torque response of Ca_1–xNa_xMnBi₂. Our findings give evidence for a spin canting occurring at T_s~50–100 K. Thus, with the support of first-principles calculations we establish a direct link between the spin canting and the reconstruction of the electronic band structure, having immediate implications for the spectral weight reshuffling in the optical response, signaling a partial gapping of the Fermi surface, and the dc transport properties below T_s.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0012704

OSTI ID:: 1633595

Report Number(s):: BNL--216026-2020-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 124; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Spin-Canting-Induced Band Reconstruction in the Dirac Material Ca 1 – x Na x MnBi 2

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Title: Spin-Canting-Induced Band Reconstruction in the Dirac Material ${Ca}_{1 - x} {Na}_{x} {MnBi}_{2}$