Response to tilted magnetic fields in $B{i}_{2}S{r}_{2}CaC{u}_2{O}_8$ with columnar defects : Evidences for transverse Meissner effect

Abstract

The transverse Meissner effect (TME) in the highly layered superconductor $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+y}$ with columnar defects is investigated by transport measurements. We present detailed evidence for the persistence of the Bose glass phase for $H_{\perp }<H_{\perp c}$ : (i) the variable-range vortex hopping process for low currents crosses over to the half-loops regime for high currents; (ii) in both regimes near $H_{\perp c}$ the energy barriers vanish linearly with $H_{\perp }$ ; (iii) the transition temperature is governed by $T_{BG}(H_{\parallel },0)-T_{BG}(H_{\parallel },H_{\perp })\sim |H_{\perp }{|}^{1/{\nu }_{\perp }}$ with ${\nu }_{\perp }=1.0\pm 0.1$. Furthermore, above the transition as $H_{\perp }\to H_{\perp c}^{+}$, moving kink chains consistent with a commensurate-incommensurate transition scenario are observed. These results thereby clearly show the existence of the TME for $H_{\perp }<H_{\perp c}$ .

4 pages, 5 figures, accepted for publication in Phys. Rev. Lett