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- W3104920486 abstract "The electronic structure of heavy-fermion materials is highly renormalised at low temperatures with localised moments contributing to the electronic excitation spectrum via the Kondo effect. Thus, heavy-fermion materials are very susceptible to Lifshitz transitions due to the small effective Fermi energy arising on parts of the renormalised Fermi surface. Here, we study Lifshitz transitions that have been discovered in YbNi _4 <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi /><mml:mn>4</mml:mn></mml:msub></mml:math> P _2 <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi /><mml:mn>2</mml:mn></mml:msub></mml:math> in high magnetic fields. We measure the angular dependence of the critical fields necessary to induce a number of Lifshitz transitions and find it to follow a simple Zeeman-shift model with anisotropic g-factor. This highlights the coherent nature of the heavy quasiparticles forming a renormalised Fermi surface. We extract information on the orientation of the Fermi surface parts giving rise to the Lifshitz transitions and we determine the anisotropy of the effective g <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>g</mml:mi></mml:math> -factor to be eta approx 3.8 <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>η</mml:mi><mml:mo>≈</mml:mo><mml:mn>3.8</mml:mn></mml:mrow></mml:math> in good agreement with the crystal field scheme of YbNi _4 <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi /><mml:mn>4</mml:mn></mml:msub></mml:math> P _2 <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi /><mml:mn>2</mml:mn></mml:msub></mml:math> ." @default.
- W3104920486 created "2020-11-23" @default.
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- W3104920486 date "2018-11-30" @default.
- W3104920486 modified "2023-10-06" @default.
- W3104920486 title "Anisotropic Zeeman Splitting in YbNi4P2" @default.
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- W3104920486 doi "https://doi.org/10.21468/scipostphys.5.5.056" @default.
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