Signature of superconducting onset in presence of large magnetoresistance in type-II Dirac semimetal candidate Ir2In8S

Since the discovery of type-II Dirac semimetal (DSM) as the potential candidate for topological superconductor, magneto-transport studies on diverse type-II DSMs have been of tremendous research interest. Here we report the structural and magneto-transport properties of type-II DSM candidate Ir2In8S...

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Bibliographic Details
Published inNew journal of physics Vol. 24; no. 10; pp. 102002 - 102011
Main Authors Malavi, Pallavi, Kumar, Prakash, Jakhar, Navita, Singh, Surjeet, Karmakar, S
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.10.2022
Subjects
Carrier density
Dirac semimetal
Electrical resistivity
Magnetic properties
Magnetoresistance
Magnetoresistivity
Phase transitions
Physics
pressure effects
Residual resistivity
Single crystals
Superconductivity
Temperature
Topological superconductors
Transport properties
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Summary:Since the discovery of type-II Dirac semimetal (DSM) as the potential candidate for topological superconductor, magneto-transport studies on diverse type-II DSMs have been of tremendous research interest. Here we report the structural and magneto-transport properties of type-II DSM candidate Ir2In8S under high pressure. With increasing pressure, this shows dramatic suppression of its characteristic large magneto-resistance, which is however partially regained upon release of pressure. No superconductivity has emerged with increasing pressures up to ∼20 GPa. However, in the pressure-released sample a significant resistivity drop below ∼4 K has been detected. The field dependent resistivity and dc magnetization measurements confirm this as superconducting onset. Ir2In8S thus becomes a unique system exhibiting large MR above the superconducting transition. X-ray diffraction results show that the ambient tetragonal structure (P42/mnm) remains stable up to ∼7 GPa, above which this undergoes a reversible structural transition into an orthorhombic structure (Pnnm). The observed enhanced residual resistivity and concurrent increase in carrier density of the normal metal state of the pressure-cycled sample indicate that the enhanced impurity scattering plays a significant role in the emergence of superconductivity.
Bibliography:NJP-115019.R2
ISSN:1367-2630
DOI:10.1088/1367-2630/ac9802