Impurity states and marginal stability of unconventional ...
Impurity states and marginal stability of unconventional ...
Impurity states and marginal stability of unconventional ...
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Motivation 1<br />
Impurities as a local probe <strong>of</strong> the symmetry <strong>of</strong> the<br />
superconducting order parameter:<br />
30 Å<br />
logarithmic intensity scale<br />
0 Å<br />
b<br />
-1.2 mV<br />
a<br />
Zn atoms in<br />
Bi 2 Sr 2 Ca(Cu 1-x Ni x ) 2 O 8+δ<br />
Four-fold symmetry,<br />
aligned with the gap nodes<br />
S.H. Pan et al, Nature (2000)