HomeNewsPhysicsTwo-dome superconductivity in a kagome superconductor found beneath excessive stress

Two-dome superconductivity in a kagome superconductor found beneath excessive stress

Temperature-pressure phase diagram of kagome superconductor CsV3Sb5. Credit: CHEN Xuliang

Recently, a analysis staff led by Prof. Yang Zhaorong from the Hefei Institutes of Physical Science (HFIPS) of the Chinese Academy of Sciences (CAS), in collaboration with researchers from the Anhui University and different establishments, found pressure-induced two-dome superconductivity within the quasi-two-dimensional topological kagome superconductor CsV3Sb5. This work was revealed in Physical Review B and chosen as Editors’ Suggestion.

Owing to its distinctive geometry, kagome lattice intrinsically hosts digital flat bands (sturdy correlations), Dirac band crossings like in graphene, and Van hove singularities, enabling realizations of quantum diversities. Recently, the kagome superconductors AV3Sb5 (A=Okay, Rb, Cs) have attracted a lot analysis pursuits resulting from discoveries of superconductivity, chiral cost impact, large anomalous Hall impact and non-trivial topological digital bands.

Pressure, as one of many three basic thermodynamic parameters, is named a clear and highly effective means to straight manipulate the lattice and additional tune the digital states. Naturally, one could ask how these phenomena work together with one another and what sort of unique states could emerge for the methods beneath stress.

In this analysis, the staff selected CsV3Sb5 for instance because it has the very best superconducting transition temperature of about 5.0 Okay amongst the methods at ambient stress. They used the so-called diamond anvil cell to generate excessive pressures as much as 47.9 GPa. They discovered that the transition temperature first will increase after which decreases quickly beneath stress, which is undetectable within the intermediate stress vary of 5–16 GPa.

Unexpectedly, superconductivity reemerges above 16 GPa, with first rising barely after which virtually leveling off.

Therefore, a two-dome superconducting phase diagram was revealed for CsV3Sb5 beneath . In phrases of the high-pressure synchrotron X-ray diffraction measurements, they did not discover any structural transition however an anomaly in ratio of the lattice parameters simply across the identical crucial , indicating a Fermi floor reconstruction by way of Lifshitz transition that is perhaps answerable for the reemergence of superconductivity.

Many experiments means that the superconductivity in CsV3Sb5 needs to be unconventional. In this sense, this work evidences a two-dome superconductivity within the first V-based unconventional superconductor.

In addition to earlier studies in great unconventional superconductors like Cu-based, Fe-based and heavy-fermion methods, two-dome superconductivity appears to be a typical characteristic for these methods beneath exterior parameters, which can present an necessary clue for understanding mechanisms of the unconventional .

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More info:
Zhuyi Zhang et al, Pressure-induced reemergence of superconductivity within the topological kagome metallic CsV3Sb5, Physical Review B (2021). DOI: 10.1103/PhysRevB.103.224513

Two-dome superconductivity in a kagome superconductor found beneath excessive stress (2021, July 13)
retrieved 13 July 2021
from https://phys.org/news/2021-07-two-dome-superconductivity-kagome-superconductor-high.html

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