Fermi surfaces of the topological semimetal CaSn3 probed through de Haas van Alphen oscillations. (20th April 2021)

• Record Type: Journal Article
• Authors: Siddiquee, K A M Hasan; Munir, Riffat; Dissanayake, Charuni; Hu, Xinzhe; Yadav, Swapnil; Takano, Yasumasa; Choi, Eun Sang; Le, Duy; Rahman, Talat S; Nakajima, Yasuyuki
• Is Part Of: Journal of physics. Volume 33:Number 17(2021)
• Publication Date: 2021-04-20
• Subjects: quantum oscillations -- topological superconductors -- topological semimetals -- de Haas van Alphen; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/abe0e2
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: In the search of topological superconductors, nailing down the Fermiology of the normal state is as crucial a prerequisite as unraveling the superconducting pairing symmetry. In particular, the number of time-reversal-invariant momenta (TRIM) in the Brillouin zone enclosed by Fermi surfaces is closely linked to the topological class of time-reversal-invariant systems, and can experimentally be investigated. We report here a detailed study of de Haas van Alphen quantum oscillations in single crystals of the topological semimetal CaSn3 with torque magnetometry in high magnetic fields up to 35 T. In conjunction with density functional theory based calculations, the observed quantum oscillations frequencies indicate that the Fermi surfaces of CaSn3 enclose an odd number of TRIM, satisfying one of the proposed criteria to realize topological superconductivity. Nonzero Berry phases extracted from the magnetic oscillations also support the nontrivial topological nature of CaSn3 .