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Structural and ferroelectric phase evolution in [ KNbO 3 ] 1 − x [ BaNi 1 / 2 Nb 1 / 2 O 3 − δ ] x ( x = 0 , 0.1 )
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Band structure of a two-dimensional Dirac semimetal from cyclotron resonance
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Superfluidity, Bose-Einstein condensation, and structure in one-dimensional Luttinger liquids
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Band connectivity for topological quantum chemistry: Band structures as a graph theory problem
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Modification of structural disorder by hydrostatic pressure in the superconducting cuprate YBa 2 Cu 3 O 6.73
Here, compelling efforts to improve the critical temperature (T c ) of superconductors have been made through high-pressure application. Understanding the underlying mechanism behind such improvements is critically important; however, much remains unclear. Here we studied ortho-III YBa 2 Cu 3 O 6.73 (YBCO) using x-ray scattering under hydrostatic pressure (HP) up to ~6.0GPa. We found the reinforced oxygen order of YBCO under HP, revealing an oxygen rearrangement in the Cu-O layer, which evidently shows the charge-transfer phenomenon between the CuO 2 plane and Cu-O layer. Concurrently, we also observed no disorder-pinned charge-density-wave signature in CuO 2 plane under HP. This indicates that the oxygen rearrangement modifies the quenched disorder state in the CuO 2 plane. Using these results, we appropriately explain why pressure condition can achieve higher T c compared with the optimal T c under ambient pressure in YBa 2 Cu 3 O 6+x . As an implication of these results, finally we have discussed that the change in disorder could make it easier for YBa 2 Cu 3 O 6+x to undergo a transition to the nematic order under an external magnetic field.