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Elastocaloric determination of the phase diagram of Sr2RuO4
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Journal Article
Elastocaloric determination of the phase diagram of Sr2RuO4
2022
Overview
One of the main developments in unconventional superconductivity in the past two decades has been the discovery that most unconventional superconductors form phase diagrams that also contain other strongly correlated states. Many systems of interest are therefore close to more than one instability, and tuning between the resultant ordered phases is the subject of intense research
1
. In recent years, uniaxial pressure applied using piezoelectric-based devices has been shown to be a particularly versatile new method of tuning
2
,
3
, leading to experiments that have advanced our understanding of the fascinating unconventional superconductor Sr
2
RuO
4
(refs.
4
–
9
). Here we map out its phase diagram using high-precision measurements of the elastocaloric effect in what we believe to be the first such study including both the normal and the superconducting states. We observe a strong entropy quench on entering the superconducting state, in excellent agreement with a model calculation for pairing at the Van Hove point, and obtain a quantitative estimate of the entropy change associated with entry to a magnetic state that is observed in proximity to the superconductivity. The phase diagram is intriguing both for its similarity to those seen in other families of unconventional superconductors and for extra features unique, so far, to Sr
2
RuO
4
.
The phase diagram of the unconventional superconductor Sr
2
RuO
4
in both normal and superconducting states is mapped out using high-precision measurements of the elastocaloric effect, showing similarities to other unconventional superconductors as well as unique features.
Publisher
Nature Publishing Group UK,Nature Publishing Group
