[Zurück]

M. Roman, H. Michor, L. Reisinger, T. Klimczuk, M. Winiarski, L. Litzbarski, J. Strychalska-Nowak, K. Kolincio:
"Interplay between multiple charge density waves and magnetic states in RNiC₂ compounds";
Vortrag: The European Conference Physics of Magnetism 2021 (PM'21), Poznan, Polen; 28.06.2021 - 02.07.2021.

The ternary rare-earth nickel dicarbides RNiC₂ (R - rare earth metal) which crystallize in a non-centrosymmetric, orthorhombic crystal structure is a unique system offering an opportunity to tune the ground state with varying R atom. The charge density wave (CDW) formation related to quasi-one-dimensional electronic features and Fermi surface nesting has been found for most of the members of the RNiC₂ family (R = Dy - Lu, Y) [1]. LaNiC2 compound is an unconventional superconductor [2], SmNiC₂ undergoes a ferromagnetic transition [3] and the rest of the compounds (apart from nonmagnetic YNiC₂, LuNiC₂ and PrNiC₂ where only a weak magnetic anomaly is observed) order antiferromagnetically below 25 K.
The comprehensive studies on both poly- and single-crystalline RNiC₂ compounds in terms of relations between various types of ordering will be presented here. The main emphasis will be put on the analysis of the CDW mutually interacting with magnetism as well as of the nature of multiple CDW transitions regarding the extended phase diagram of RNiC₂ family [1]. In contrast to completely destructive influence of ferromagnetism on the CDW previously found for SmNiC₂ [3], positive impact of the magnetic anomaly on CDW in PrNiC₂ [4] and partial suppression of the CDW state by antiferromagnetic transition observed in NdNiC₂ [4], GdNiC₂ [5] and their solid solutions [6], [7] will be discussed here. For late-lanthanide-based RNiC₂ (R = Y, Lu [8] and Tm [9]), the large positive magnetoresistance (reaching 470%), induced by the high-mobility carriers from small pockets of imperfectly-nested Fermi surface induce, will be also reported here.
References:
[1] M. Roman et al., Physical Review B 99, 035136 (2018)
[2] J. F. Landaeta et al., Physical Review B 96, 174515 (2017)
[3] S. Shimomura et al., Physical Review Letters 102, 076404 (2009)
[4] K. K. Kolincio et al., Physical Review B 95, 235156 (2017)
[5] K. K. Kolincio et al., Physical Review B 94, 195149 (2016)
[6] M. Roman et al., Physical Review B 98, 035136 (2018)
[7] M. Roman et al., Physical Review B 99, 245152 (2019)
[8] K. K. Kolincio et al., Physical Review B 99, 205127 (2019)
[9] K. K. Kolincio et al., Physical Review Letters 125, 176601 (2020)
Authors gratefully acknowledge the financial support from National Science Centre (Poland), from Grants No. DEC-2018/28/T/ST3/00164 (M. R) and DEC-2015/19/B/ ST3/03127.

rare earth intermetallic catbides, charge density wave