Mitrabhanu Sahu

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Phase slips are topological fluctuations that carry the superconducting order-parameter field between distinct current-carrying states. Owing to these phase slips, superconducting nanowires acquire electrical resistance. In such wires, it is well known that at higher temperatures phase slips occur through the process of thermal barrier-crossing by the(More)
We report measurements of switching current distribution SWCD from a phase-diffusion branch PDB to a quasiparticle-tunneling branch QTB as a function of temperature in a cuprate-based intrinsic Josephson junction. Contrary to the thermal-activation model, the width of the SWCD increases and the corresponding switching rate shows a nonlinear behavior with a(More)
David Pekker,1,2 Nayana Shah,2,3 Mitrabhanu Sahu,2 Alexey Bezryadin,2 and Paul M. Goldbart2 1Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA 2Department of Physics, University of Illinois at Urbana–Champaign, 1110 West Green Street, Urbana, Illinois 61801, USA 3Department of Physics, University of Cincinnati,(More)
Undoped and europium doped CaMoO4 and SrMoO4 scheelites are synthesized using a complex polymerization method. The phase purity of the sample is confirmed using powder X-ray diffraction (PXRD). X-ray photoelectron spectroscopy (XPS) was carried out to confirm the oxidation states of various constituents and dopant elements and also the presence of oxygen(More)
Phase slips are topological fluctuation events that carry the superconducting order-parameter field between distinct current carrying states. Owing to these phase slips low-dimensional superconductors acquire electrical resistance. In quasi-one-dimensional nanowires it is well known that at higher temperatures phase slips occur via the process of thermal(More)
We will briefly discuss the theories for thermally activated phase slips (TAPS) given by Langer, Ambegaokar, McCumber and Halperin(LAMH) and the theory of macroscopic quantum phase slips(QPS).Experimental evidence of thermally activated phase slips in superconducting nanowires (10-30 nm wide) and its agreement with LAMH theory will be discussed. We will(More)
Microwave response of S-shaped Bi2Sr2CaCu2O8+x BI-2212 micron-scale samples, in which the supercurrent was forced to flow perpendicular to the crystal layers, was investigated. A treatment with a focused ion beam allowed us to reduce the plasma frequency down to fp 5 GHz at T=0.3 K in naturally stacked Josephson junctions in a crystal. We observed Shapiro(More)
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