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Lifshitz transitions and quasiparticle de-renormalization in YbRh2Si2

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Naren,  H. R.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Friedemann,  S.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Krellner,  C.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wirth,  S.
Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Naren, H. R., Friedemann, S., Zwicknagl, G., Krellner, C., Geibel, C., Steglich, F., et al. (2013). Lifshitz transitions and quasiparticle de-renormalization in YbRh2Si2. New Journal of Physics, 15: 093032, pp. 093032-1-093032-13. doi:10.1088/1367-15/9/093032.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-1E50-A
Abstract
We study the effect of magnetic fields up to 15 T on the heavy fermion state of YbRh2Si2 via Hall effect and magnetoresistivity measurements down to 50 mK. Our data show anomalies at three different characteristic fields. We compare our data to renormalized band structure calculations through which we identify Lifshitz transitions associated with the heavy fermion bands. The Hall measurements indicate that the de-renormalization of the quasiparticles, i.e. the destruction of the local Kondo singlets, occurs smoothly while the Lifshitz transitions occur within rather confined regions of the magnetic field.