Structural changes induced by electric currents in a single crystal of Pr2CuO4

Roy, Susmita; Ye, Feng; Morgan, Zachary; Mathur, Kabir; Parulekar, Anish; Jalali, Syed A.; Zhang, Yu; Cao, Gang; Kaneko, Nobu-Hisa; Greven, Martin; Raj, Rishi; Reznik, Dmitry

doi:10.1103/physrevmaterials.7.083803

Structural changes induced by electric currents in a single crystal of Pr 2 CuO 4

Journal Article · Mon Aug 21 00:00:00 EDT 2023 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.7.083803· OSTI ID:1997661

Roy, Susmita ^[1]; ^[2]; ^[2]; Mathur, Kabir ^[1]; Parulekar, Anish ^[1]; ^[1]; Zhang, Yu ^[1]; Cao, Gang ^[1]; Kaneko, Nobu-Hisa ^[3]; Greven, Martin ^[4]; Raj, Rishi ^[1]; ^[1]

University of Colorado at Boulder, CO (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan)
University of Minnesota, Minneapolis, MN (United States)

We demonstrate an approach to the structural and electronic property modification of perovskites, focusing on Pr₂CuO₄, an undoped parent compound of a class of electron-doped copper-oxide superconductors. Currents were passed parallel or perpendicular to the copper oxygen layers with the voltage ramped up until a rapid drop in the resistivity was achieved, a process referred to as “flash.” The current was then further increased tenfold in current-control mode. This state was quenched by immersion into liquid nitrogen. Flash can drive many compounds into different atomic structures with new properties, whereas the quench freezes them into a long-lived state. Single-crystal neutron diffraction of as-grown and modified Pr₂CuO₄ revealed a √10 ×√10 superlattice due to oxygen-vacancy order. The diffraction peak intensities of the superlattice of the modified sample were significantly enhanced relative to the pristine sample. Raman-active phonons in the modified sample were considerably sharper. Measurements of electrical resistivity, magnetization, and two-magnon Raman scattering indicate that the modification affected only the Pr-O layers, but not the Cu-O planes. These results point to enhanced oxygen-vacancy order in the modified samples well beyond what can be achieved without passing electrical current. Our work opens a new avenue toward electric field/quench control of structure and properties of layered perovskite oxides.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Office of Naval Research

Grant/Contract Number:: AC05-00OR22725; SC0006939; SC0016371

OSTI ID:: 1997661

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 8 Vol. 7; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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