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High-pressure synthesis of a ternary yttrium-sulfur hydride superconductor with a high Tc of approximately 235 K
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High-pressure synthesis of a ternary yttrium-sulfur hydride superconductor with a high Tc of approximately 235 K
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Journal Article
High-pressure synthesis of a ternary yttrium-sulfur hydride superconductor with a high Tc of approximately 235 K
2024
Overview
Ternary hydrides have attracted considerable worldwide attention owing to their potential high-temperature superconducting phases. In contrast to previously reported alloy-based ternary hydrides, we selected the rare earth metal yttrium and light element sulfur to form new yttrium-sulfur hydride superconductors as the target at high pressure, which also linked the two categories of binary clathrate YH
6
and covalent H
3
S high-temperature superconductors. The rare earth metal ions served as carrier donors for the dissociation of H
2
molecules and the formation of clathrate-like cage structures, while the light elements helped stabilize the materials. By applying high-pressure and high-temperature conditions, two possible ternary hydrides, i.e.,
and
I
4/
mmm
-(Y,S)H
4+δ
, were discovered.
is a ternary hydride with a record superconducting transition temperature (
T
c
) of 235 K belonging to the single-metal hydride system, exhibiting an 11% increment in
T
c
compared with binary
. In the pressure range of 199–249 GPa, the
T
c
of this phase displayed a decreasing tendency but with an apparent slope change, indicating the possible structural distortions or electronic structure changes at 227 GPa. Concurrently, the extrapolated upper critical magnetic field
H
c2
was determined to be 85 T using the Werthamer-Helfand-Hohenberg formula at 199 GPa, with a 37% increment compared with
. The slight volume expansion (∼3%) of
compared with that of binary
signified the possible interstitial sites of sulfur atoms filling into the hydrogen cages. The size expansion of the center atoms might attract more hydrogen atoms to stabilize the hydrogen cages, contributing to the enhancement of
T
c
and
H
c2
in
. The present study demonstrates that introduction of light elements is an effective way for enhancing
T
c
by forming larger hydrogen cages.
Publisher
Science China Press,Springer Nature B.V
Subject
