X-ray data on Cu1234 show a sharp c-axis contraction and in-plane negative thermal expansion at the 118 K superconducting transition, which the authors link to multigap superconductivity.
Phase Separation in Cuprate Superconductors
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Lattice Quantum Geometry Controlling 118 K Multigap Superconductivity in Heavily Overdoped CuBa2Ca3Cu4O10+d
X-ray data on Cu1234 show a sharp c-axis contraction and in-plane negative thermal expansion at the 118 K superconducting transition, which the authors link to multigap superconductivity.