Superconductivity in Compositionally-Complex Cuprates with the YBa$_2$Cu$_3$O$_{7-x}$ Structure

Aditya Raghavan; Nathan Arndt; Nayelie Morales-Colón; Eli Wennen; Megan Wolfe; Carolina Oliveira Gandin; Kade Nelson; Robert Nowak; Sam Dillon; Keon Sahebkar; Ryan F. Need

doi:10.1103/PhysRevMaterials.8.024801

paper

Superconductivity in Compositionally-Complex Cuprates with the YBa $_{2}$ Cu $_{3}$ O $_{7 - x}$ Structure

arXiv:2309.12535 · doi:10.1103/PhysRevMaterials.8.024801

Abstract

High-temperature superconductivity is reported in a series of compositionally-complex cuprates with varying degrees of size and spin disorder. Three compositions of Y-site alloyed YBa $_{2}$ Cu $_{3}$ O $_{7 - x}$ , i.e., (5Y)BCO, were prepared using solid-state methods with different sets of rare earth ions on the Y-site. Synchrotron X-ray diffraction and energy-dispersive X-ray spectroscopy confirm these samples have high phase-purity and homogeneous mixing of the Y-site elements. The superconducting phase transition was probed using electrical resistivity and AC magnetometry measurements, which reveal the transition temperature, T $_{C}$ , is greater than 91 K for all series when near optimal oxygen doping. Importantly, these T $_{C}$ values are only $\approx$ 1 $%$ suppressed relative to pure YBCO (T $_{C}$ = 93 K). This result highlights the robustness of pairing in the YBCO structure to specific types of disorder. In addition, the chemical flexibility of compositionally-complex cuprates allows spin and lattice disorder to be decoupled to a degree not previously possible in high-temperature superconductors. This feature makes compositionally-complex cuprates a uniquely well-suited materials platform for studying proposed pairing interactions in cuprates.

6 pages, 3 figures, 1 table

Superconductivity in Compositionally-Complex Cuprates with the YBa2​Cu3​O7−x​ Structure

Abstract

References in corpus (10)

Superconductivity in Compositionally-Complex Cuprates with the YBa $_{2}$ Cu $_{3}$ O $_{7 - x}$ Structure