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Change of strength of vortex pinning in YBCO due to BaZrO_3 inclusion | | N. Pompeo
; V. Galluzzi
; R. Rogai
; G. Celentano
; E. Silva
; | | Date: |
21 Oct 2007 | | Abstract: | We probe the short-range pinning properties with the application of microwave
currents at very high driving frequencies (47.7 GHz) on
YBa$_2$Cu$_3$O$_{7-delta}$ films with and without sub-micrometer BaZrO$_3$
inclusions. We explore the temperature and field ranges 60 K$<T<T_c$ and
0$<mu_0H<$0.8 T, with the field applied along the c-axis. The magnetic field
induces a much smaller increase of the microwave resistivity, $Delta
ho_1(H)+mathrm{i}Delta
ho_2(H)$, in YBa$_2$Cu$_3$O$_{7-delta}$/BaZrO$_3$
with respect to pure YBa$_2$Cu$_3$O$_{7-delta}$. $Delta
ho_1(H)$ is
slightly superlinear in pure YBa$_2$Cu$_3$O$_{7-delta}$ (suggesting a possible
contribution of thermal activation), but linear or sublinear in
YBa$_2$Cu$_3$O$_{7-delta}$/BaZrO$_3$ (suggesting a possible suppression of
thermal activation as a consequence of BaZrO$_3$ inclusions). These features
persist up to close to $T_c$. We discuss our data in terms of the ratio
$r=Delta X_s’(H)/Delta R_s’(H)$ in the framework of the models for the
microwave surface impedance in the mixed state. Large $r$ are found in
YBa$_2$Cu$_3$O$_{7-delta}$/BaZrO$_3$, with little field dependence. By
contrast, smaller values and stronger field dependences are found in pure
YBa$_2$Cu$_3$O$_{7-delta}$. We discuss the different field dependence of the
pinning constant. | | Source: | arXiv, 0710.3943 | | Services: | Forum | Review | PDF | Favorites | |
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