Novel superconducting proximized heterostructures for ultrafast photodetection

Time-resolved optical response of all-oxide YBa2Cu3O7/LaParlato1, Arpaia2, Lisio3 et al. 2013Phys. Rev. BSelf Cite

“…First we note that below T c , our YBCO/LSMO bilayers have relaxation times shorter than YBCO, in agreement with the YBCO/Au/NiCu case. 10 We also observe the presence of sharp peaks in both the fast and slow (YBCO only) relaxation time dependences, which we believe correspond to the occurrence of a superconducting transition within the probed samples, reflecting the change in the quasi-particle dynamics caused by the electronic-specific heat jump. 21,24 As expected, the T c peak feature shifts slightly to lower temperatures for the thicker LSMO overlayers but, most interestingly, still remains well visible, contrary to metallic, S/F proximitized bilayers.…”

“…The RHEED patterns demonstrated very high crystallinity of our bilayer structures at every step of the process. 10 Cooling of the samples included a prolonged exposure to 200 Mbar of O 2 at 500°C, to promote full oxidation of YBCO through the LSMO capping. The resulting nanostructures had excellent structural and transport properties, with ~0.3° full-width-at-half-maximum rocking curves and sharp superconducting transition (T co up to 91.5 K, DT c ~ 0.3 K).…”

“…Beside a constantly growing field of spintronics, our research attention has been devoted to YBa 2 Cu 3 O 7 /La 0.7 Sr 0.3 MnO 3 (YBCO/ LSMO) hybrids as possible, artificially engineered, ultrafast optoelectronics devices. 10,11 However, nonequilibrium properties of the S/F bilayers are far from being fully characterized…”

Investigation of dark counts in innovative materials for superconducting nanowire single-photon detector applications

“…Independently, recent, extensive efforts have been made to explore feasibility of SNSPDs based on YBCO [17][18][19][20][21]. The YBCO obvious advantage is its very high T C , intrinsic, a few-ps-long quasiparticle recombination time [15,21], as well as other desired features of an unconventional superconducting material [22]. On the other hand, YBCO exhibits a coherence length of about 2 nm [23], making it extremely difficult to fabricate ultrathin and ultra-narrow superconducting nanostripes needed for effective photon detection.…”

Influence of Fe Buffer Layer on Co-Doped BaFe2As2Superconducting Thin Films

“…The sample was mounted in the same cryostat used for MOKE measurements. Further details on the experimental methods can be found in [21]. The photoinduced normalized reflectivity change Δ / , as a function of time, was measured using a pump fluence of 12 J/cm 2 and 20 times weaker probe.…”