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000943358 1001_ $$0P:(DE-Juel1)171406$$aSchmitt, Tobias W$$b0$$eCorresponding author
000943358 245__ $$aAnomalous temperature dependence of multiple Andreev reflections in a topological insulator Josephson junction
000943358 260__ $$aBristol$$bIOP Publ.$$c2023
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000943358 520__ $$aAs a promising platform for unconventional superconductivity, Josephson junctions (JJs) of tetradymite topological insulators (TIs) and s-wave superconductors have been investigated in recent years. This family of TI materials, however, often suffers from spurious bulk transport, which hampers the observation of the exotic physics of their topological surface states. Thus, disentangling the transport mechanism of bulk and surface contributions in TI JJs is of high importance when investigating proximity induced superconductivity in those crystals. In this work, we add to the insights regarding these contributions by studying the temperature-dependent behaviour of a Bi2Te3-based JJ with transparent interfaces. In electrical transport measurements, we investigate differential conductance spectra of multiple Andreev reflections (MARs) and find a qualitative temperature-dependent change from peak features at low temperatures to dip features at higher ones. The observation of both kind of MAR patterns in a single JJ suggests contributions of diffusive bulk and ballistic surface states and links to a similar finding in the temperature dependence of the critical current. Our work advances the research of induced superconductivity in TIs and offers new avenues to study the induced superconductivity in the topological surface states of these materials.
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000943358 7001_ $$0P:(DE-Juel1)186071$$aFrohn, Benedikt$$b1
000943358 7001_ $$0P:(DE-HGF)0$$aWittl, Wilhelm$$b2
000943358 7001_ $$0P:(DE-Juel1)171826$$aJalil, Abdur R$$b3$$ufzj
000943358 7001_ $$0P:(DE-Juel1)171405$$aSchleenvoigt, Michael$$b4$$ufzj
000943358 7001_ $$0P:(DE-Juel1)176848$$aZimmermann, Erik$$b5
000943358 7001_ $$0P:(DE-Juel1)186704$$aSchmidt, Anne$$b6$$ufzj
000943358 7001_ $$0P:(DE-Juel1)128634$$aSchäpers, Thomas$$b7
000943358 7001_ $$0P:(DE-HGF)0$$aCuevas, Juan Carlos$$b8
000943358 7001_ $$0P:(DE-HGF)0$$aBrinkman, Alexander$$b9
000943358 7001_ $$0P:(DE-Juel1)125588$$aGrützmacher, Detlev$$b10$$ufzj
000943358 7001_ $$0P:(DE-Juel1)165984$$aSchüffelgen, Peter$$b11
000943358 773__ $$0PERI:(DE-600)1361475-7$$a10.1088/1361-6668/aca4fe$$gVol. 36, no. 2, p. 024002 -$$n2$$p024002 -$$tSuperconductor science and technology$$v36$$x0953-2048$$y2023
000943358 8564_ $$uhttps://juser.fz-juelich.de/record/943358/files/Schmitt_2023_Supercond._Sci._Technol._36_024002.pdf$$yOpenAccess
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