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Journal Article
Pressure tuning of competing interactions on a honeycomb lattice
2025
Overview
Exchange interactions are mediated via orbital overlaps across chemical bonds. Thus, modifying the bond angles by physical pressure or strain can tune the relative strength of competing interactions. Here we present a remarkable case of such tuning between the Heisenberg (
J
) and Kitaev (
K
) exchange, which respectively establish magnetically ordered and spin liquid phases on a honeycomb lattice. We observe a rapid suppression of the Néel temperature (
T
N
) with pressure in Ag
3
LiRh
2
O
6
, a spin-1/2 honeycomb lattice with both
J
and
K
couplings. Using a combined analysis of x-ray data and first-principles calculations, we find that pressure modifies the bond angles in a way that increases the ∣
K
/
J
∣ ratio and thereby suppresses
T
N
. Consistent with this picture, we observe a spontaneous onset of muon spin relaxation (
μ
SR) oscillations below
T
N
at low pressure, whereas in the high pressure phase, oscillations appear only when
T
<
T
N
/2. Unlike other candidate Kitaev materials, Ag
3
LiRh
2
O
6
is tuned toward a quantum critical point by pressure while avoiding a structural dimerization in the relevant pressure range.
Kitaev interactions on a honeycomb lattice can potentially lead to a quantum spin liquid state. Unfortunately, materials hosting Kitaev interactions also host Heisenberg interactions favouring long range order. Here, Sakrikar, Shen, Poldi and coauthors find that the relative strength of the Heisenberg and Kitaev interactions can be tuned by pressure in Ag
3
LiRh
2
O
6
.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
