Naslov
Magnetoconductivity
(Magnetoconductivity of CaC6 with a CDW-reconstructed Fermi Surface)

Autori
Grozić, Petra ; Keran, Barbara ; Kadigrobov, Anatoly ; Rukelj, Zoran ; Radić, Danko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Condensed Matter and Quantum Materials 2023 (CMQM)

Mjesto i datum
Birmingham, Ujedinjeno Kraljevstvo, 28.06.2023. - 30.06.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Graphene ; Fermi surface reconstruction ; Magnetoconductivity ; Charge Gensity Waves

Sažetak
The physics of intercalated graphite compounds (GIC), in spite of the fact that these materials have been synthesized quite long ago, is still in the focus of modern theoretical and experimental research. The interest of the scientific community is focused to GIC mostly due to the possibility to form the unusual superconducting (SC) and charge density wave (CDW) ground states. We focus on one of these materials, CaC6, in which experiments clearly demonstrate existence of CDWs. The very existence of the CDW is quite unusual due to the fact that the graphene Fermi surface (FS), chemically doped by calcium intercalates, shoves no so-called "nesting property", i.e. no Peierls mechanism, which has been the paradigmatic mechanism leading to the CDW instability since 50s of the last century, and experimentally realized during 80s in the highly anisotropic materials with open Fermi surfaces. We show that the CaC6 Fermi surface undergoes a different CDW formation mechanism, based on the topological reconstruction (of the FS) and critical strength of the electron-phonon interaction. Such topological reconstruction, that transforms the set of closed Fermi pockets to the open Fermi sheets, has profound effect of the transport and magnetotransport properties. We show the signature of the FS reconstruction by the CDW in the magnetotransport properties, taking into account magnetic breakdown, which shows characteristic quantum oscillations.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA