Charge orders with distinct magnetic response in a prototypical kagome superconductor LaRu_3Si_2
arxiv(2024)
Abstract
The kagome lattice has emerged as a promising platform for hosting
unconventional chiral charge order at high temperatures. Notably, in
LaRu_3Si_2, a room-temperature charge-ordered state with a propagation
vector of (1/4, 0, 0) has been recently identified. However,
understanding the interplay between this charge order and superconductivity,
particularly with respect to time-reversal-symmetry breaking, remains elusive.
In this study, we employ single crystal X-ray diffraction, magnetotransport,
and muon-spin rotation experiments to investigate the charge order and its
electronic and magnetic responses in LaRu_3Si_2 across a wide
temperature range down to the superconducting state. Our findings reveal the
emergence of a charge order with a propagation vector of (1/6, 0, 0)
below T_ CO,2 ≃ 80 K, coexisting with the previously identified
room-temperature primary charge order (1/4, 0, 0). The primary
charge-ordered state exhibits zero magnetoresistance. In contrast, the
appearance of the secondary charge order at T_ CO,2 is accompanied by a
notable magnetoresistance response and a pronounced temperature-dependent Hall
effect, which experiences a sign reversal, switching from positive to negative
below T^* ≃ 35 K. Intriguingly, we observe an enhancement in the
internal field width sensed by the muon ensemble below T^* ≃ 35 K.
Moreover, the muon spin relaxation rate exhibits a substantial increase upon
the application of an external magnetic field below T_ CO,2 ≃
80 K. Our results highlight the coexistence of two distinct types of charge
order in LaRu_3Si_2 within the correlated kagome lattice, namely a
non-magnetic charge order (1/4, 0, 0) below T_ co,1 ≃
400 K and a time-reversal-symmetry-breaking charge order below T_ CO,2.
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