首页|Wohlleben Effect and Emergent 7C junctions in superconducting Boron doped Diamond thin films
Wohlleben Effect and Emergent 7C junctions in superconducting Boron doped Diamond thin films
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NSTL
Elsevier
Diamond is an excellent wide-bandgap electrical insulator. However, boron (B) doping is known to induce superconductivity in diamonds. We have performed electrical transport and magnetic measurements under pressure with doping concentrations of (1.4 and 2.6) x 10(21) cm(-3), in a temperature range 2 - 10 K and present two interesting effects in superconducting B doped diamond (BDD) thin films: (i) Wohlleben effect (paramagnetic Meissner effect, PME) and (ii) pressure-induced spin glass-like susceptibility anomaly. PME, a low field anomaly in inhomogeneous superconductors, could arise from flux trapping, flux compression, or for non-trivial reason such as emergent Josephson pi junctions. The joint occurrence of PME and spin glass type anomalies points to the possible emergence of pi junctions. BDD is a disordered s-wave superconductor; and pi junctions could be produced by spin-flip scattering of spin 'A moments when present at weak superconducting regions. A frustrated network of 0 and pi junctions will result in a distribution of spontaneous equilibrium supercurrents, a spin glass (phase glass) state. Anderson localized spin 'A spinons embedded in a metallic fluid (two-fluid model) could create pi junction by spin-flip scattering. Our findings are consistent with the presence of pi junctions, invoked to explain the observation of certain resistance anomaly in BDD.
Boron doped diamondSuperconductorParamagnetic Meissner effectSpin glassIMPURITY BAND SUPERCONDUCTIVITY
Govindaraj, L.、Arumugam, S.、Thiyagarajan, R.、Kumar, Dinesh、Kannan, M.、Das, Dhruba、Suraj, T. S.、Sankaranarayanan, V.、Sethupathi, K.、Baskaran, G.、Sankar, Raman、Rao, M. S. Ramachandra
NSTL
Elsevier
