Pairing symmetry and flux quantization in a tricrystal superconducting ring of YBa2Cu3O7- delta.
Pairing symmetry and flux quantization in a tricrystal superconducting ring of YBa2Cu3O7- delta.
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DOI：
10.1103/physrevlett.73.593
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发表时间：
1994-07
影响因子：
8.6
通讯作者：
C. Tsuei;J. Kirtley;C. Chi;L. Yu-Jahnes;A. Gupta;T. Shaw;Jonathan Z. Sun;M. Ketchen
中科院分区：
文献类型：
--
作者：
C. Tsuei;J. Kirtley;C. Chi;L. Yu-Jahnes;A. Gupta;T. Shaw;Jonathan Z. Sun;M. Ketchen
We have used the concept of flux quantization in superconducting $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ rings with 0, 2, and 3 grain-boundary Josephson junctions to test the pairing symmetry in high-${T}_{c}$ superconductors. The magnetic flux threading these rings at 4.2 K is measured by employing a scanning superconducting quantum interference device microscope. Spontaneous magnetization of a half magnetic flux quantum, $\frac{{\ensuremath{\Phi}}_{0}}{2}=\frac{h}{4e}$ has been observed in the 3-junction ring, but not in the 2-junction rings. These results are consistent with $d$-wave pairing symmetry.
We have used the concept of flux quantization in superconducting $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ rings with 0, 2, and 3 grain-boundary Josephson junctions to test the pairing symmetry in high-${T}_{c}$ superconductors. The magnetic flux threading these rings at 4.2 K is measured by employing a scanning superconducting quantum interference device microscope. Spontaneous magnetization of a half magnetic flux quantum, $\frac{{\ensuremath{\Phi}}_{0}}{2}=\frac{h}{4e}$ has been observed in the 3-junction ring, but not in the 2-junction rings. These results are consistent with $d$-wave pairing symmetry.