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
V. Ta Phuoc, E. Olive, R. De Sousa, A. Ruyter, L. Ammor, J.C. Soret
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
⊥
<
H
⊥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
⊥c
the energy barriers vanish linearly with
H
⊥
; (iii) the transition temperature is governed by
T
BG
(
H
∥
,0)−
T
BG
(
H
∥
,
H
⊥
)∼|
H
⊥
|
1/
ν
⊥
with
ν
⊥
=1.0±0.1
. Furthermore, above the transition as
H
⊥
→
H
+
⊥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
⊥
<
H
⊥c
.