TY - JOUR
T1 - Critical current, magnetization relaxation and activation energies for YBa2Cu3O7 and YBa2Cu4O8 films
AU - Schnack, H. G.
AU - Hai-hu, Wen
AU - Griessen, R.
AU - Dam, B.
AU - Rector, J.
PY - 1994/12
Y1 - 1994/12
N2 - The supercurrent js and the dynamical relaxation rate Q ≡ dlnjs/dln(dBe/dt) of YBa2Cu3O7 and YBa2Cu4O8 films of about 100 nm thickness have been measured by means of a torque magnetometer for temperatures up to Tc and fields up to Be = 7 T. From these data the true critical current jc(T, Be) and the activation energy function U(j, T, Be) for thermally activated flux motion have been calculated. For fields smaller than about 2 T, both samples are in the single vortex regime. The obtained U(j, T = 0, Be) dependence is rather well described by the collective pinning interpolation formula.
AB - The supercurrent js and the dynamical relaxation rate Q ≡ dlnjs/dln(dBe/dt) of YBa2Cu3O7 and YBa2Cu4O8 films of about 100 nm thickness have been measured by means of a torque magnetometer for temperatures up to Tc and fields up to Be = 7 T. From these data the true critical current jc(T, Be) and the activation energy function U(j, T, Be) for thermally activated flux motion have been calculated. For fields smaller than about 2 T, both samples are in the single vortex regime. The obtained U(j, T = 0, Be) dependence is rather well described by the collective pinning interpolation formula.
UR - http://www.scopus.com/inward/record.url?scp=26344452079&partnerID=8YFLogxK
U2 - 10.1016/0921-4534(94)90959-8
DO - 10.1016/0921-4534(94)90959-8
M3 - Article
AN - SCOPUS:26344452079
SN - 0921-4534
VL - 235-240
SP - 2865
EP - 2866
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - PART 5
ER -