Abstract
Phase-sensitive test experiments for pairing symmetry of the high-temperature superconductors are reviewed. These experiments are discussed under the assumption of d x 2− y 2 -wave pairing. The influence of the superconducting state on the c-axis Josephson effect is analyzed. Special grain boundaries between the YBCO films can be described as Josephson junctions with alternating segments with 0- and π-phase shifts. The occurrence of spontaneous flux pattern on these grain boundaries is discussed.
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