Direct observation of non-collinear vortex structures induced by twin boundaries in YBa{sub 2}Cu{sub 3}O{sub y} single crystals
- Imperial College, London (United Kingdom)
- Imperial College, London (United Kingdom); and others
Using vector magnetic moment measurements, in twinned YBa{sub 2}Cu{sub 3}O{sub y} single crystals the authors observe a nearly reversible M{sub ab} component magnetisation with sharp peaks in the dependence of M{sub ab} on the magnetic field H and angle {var_phi} between c-axis and magnetic field. The association of these features with twin boundaries is supported by geometrical arguments and by comparison with determined samples. For a crystal with a single dominant direction of twin boundaries, the initial slope of the M{sub ab}(H) and M{sub ab}({var_phi}) dependences corresponds closely to ideal shielding of the transverse H component, as expected for the fully-locked vortex state. The peak position, which is related to the locking angle, shows a close to linear H{sub p}{sup {minus}1} vs {var_phi} dependence, which corresponds to a fixed value of H{sub L} the locking field. The influence of twins vanishes above a trapping angle {var_phi}{sub T}, which shows rather weak temperature and magnetic field dependences; at 60K and 1T these parameters are {mu}{sub 0}H{sub L}=27mT and {var_phi}{sub T} {approx} 10{degrees}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 443632
- Report Number(s):
- CONF-960808--; CNN: Grant HT931241; Grant 96-02-18376a
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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