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Observation of a Zeeman Induced Lifshitz Transition in URu2Si2

High resolution longitudinal sound velocity measurements in a magnetic field performed at T tending to zero in URu2Si2 reveal a second signature at a field BLT in addition to the step change in velocity expected at the superconducting upper critical field, Bc2. Characteristic Fermi surface related magneto-acoustic quantum oscillations (MAQO) emerge beyond the field BLT at a frequency ~160 T for B||a-axis. Measurements performed with B oriented at various angles between the a and c-axes reveal an anisotropy for BLT nearly identical to that of BC2 suggesting similarity of the electron states involved in both the transitions. Given the observed frequency of ~160 T in the MAQO the transition is most likely related to the emergence of the \ηFermi surface in URu2Si2 (Lifshitz transition).

preprint2014arXivOpen access
B. S. ShivaramV. W. UlrichD. G. Hinks
cond-mat.supr-concond-mat.str-el
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B. S. ShivaramV. W. UlrichD. G. Hinks

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