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26 April 2024 |
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Shubnikov-de Haas and de Haas-van Alphen oscillations in topological semimetal CaAl4 | | Sheng Xu
; Jian-Feng Zhang
; Yi-Yan Wang
; Lin-Lin Sun
; Huan Wang
; Yuan Su
; Xiao-Yan Wang
; Kai Liu
; Tian-Long Xia
; | | Date: |
15 Nov 2018 | | Abstract: | We report the magneto-transport properties of CaAl$_4$ single crystals with
$C2/m$ structure at low temperature. CaAl$_4$ exhibits large unsaturated
magnetoresistance $sim$3000$\%$ at 2.5 K and 14 T. The nonlinear Hall
resistivity is observed, which indicates the multi-band feature. The
first-principles calculations show the electron-hole compensation and the
complex Fermi surface in CaAl$_4$, to which the two-band model with
over-simplified carrier mobility can’t completely apply. Evident quantum
oscillations have been observed with B//c and B//ab configurations, from which
the nontrivial Berry phase is extracted by the multi-band Lifshitz-Kosevich
formula fitting. An electron-type quasi-2D Fermi surface is found by the
angle-dependent Shubnikov-de Haas oscillations, de Haas-van Alphen oscillations
and the first-principles calculations. The calculations also elucidate that
CaAl$_4$ owns a Dirac nodal line type band structure around the $Gamma$ point
in the $Z$-$Gamma$-$L$ plane, which is protected by the mirror symmetry as
well as the space inversion and time reversal symmetries. Once the spin-orbit
coupling is included, the crossed nodal line opens a negligible gap (less than
3 meV). The open-orbit topology is also found in the electron-type Fermi
surfaces, which is believed to help enhance the magnetoresistance observed. | | Source: | arXiv, 1811.6326 | | Services: | Forum | Review | PDF | Favorites | |
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