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We report properties of topological insulator - ferromagnet - superconductortrilayers comprised of thin films of 20 nm thick $\rm Bi_2Se_3$ on 10 nm $\rmSrRuO_3$ on 30 nm $\rm YBa_2Cu_3O_x$. As deposited trilayers are underdoped andhave a superconductive transition with $\rm T_c$ onset at 75 K, zero resistanceat 65 K, $\rm T_{Cueri}$ at 150 K and $\rm T^*$ of about 200 K. Furtherreannealing under vacuum yields the 60 K phase of $\rm YBa_2Cu_3O_x$ whichstill has zero resistance below about 40 K. Only when $10\times 100$micro-bridges were patterned in the trilayer, some of the bridges showedresistive behavior all the way down to low temperatures. Magnetoresistanceversus temperature of the superconductive ones showed the typical peak due toflux flow against pinning below $\rm T_c$, while the resistive ones showed onlythe broad leading edge of such a peak. All this indicates clearly weak-linksuperconductivity in the resistive bridges between superconductive $\rmYBa_2Cu_3O_x$ grains via the topological and ferromagnetic cap layers.Comparing our results to those of a reference trilayer with the topological$\rm Bi_2Se_3$ layer substituted by a non-superconducting highly overdoped $\rmLa_{1.65}Sr_{0.35}CuO_4$, indicates that the superconductive proximity effectas well as ferromagnetism in the topological trilayer are actually stronglysuppressed compared to the non-topological reference trilayer. This strongsuppression is likely to originate in strong proximity induced edge currents inthe SRO/YBCO layer that can lead to Majorana bound states, a possible signatureof which is observed in the present study as zero bias conductance peaks.

superconductor science and technology/superconductor science and technology

Strongly suppressed superconducting proximity effect and ferromagnetism  in trilayers of $\rm Bi_2Se_3$ / $\rm SrRuO_3$ / underdoped $\rm  YBa_2Cu_3O_x$: A possible new platform for Majorana nano-electronics