Thermoelectric power of inhomogeneous superconductors: A new kind of percolation

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“…Therefore, we judge that the critical temperature of LK-99 is over 400 K. Moreover, since LK-99 has a polycrystalline morphology shown in Figure 2, the non-uniform resistivity of the bulk samples can be explained as inter-grain boundaries, intergranular vortex flow, free vortex flow (18)(19)(20) of polycrystalline superconducting phase. The Josephson-like phenomenon (Figure S1(a) in supplementary materials) for the under-damped junction of superconductor-normal metal-superconductor (21,22) or Intergrain coupled superconductors (23) and the thermoelectric effect (24)(25)(26) of the inter-or intra-grain network(Figure S1(b) in supplementary materials) were also observed. Figure 2 shows the results of LK-99 matched with the QualX2.0 software (27) and proved by simulated data using VESTA software (28), which uses Crystallography Open Database (COD) to perform the search-match operation (27).…”