Lattice distortions and the metal–insulator transition in pure and Ti-substituted Ca3Ru2O7

Petkov, V.; Rao, T. Durga; Zafar, A.; Abeykoon, A. M. Milinda; Fletcher, E.; Peng, J.; Mao, Z. Q.; Ke, X.

doi:10.1088/1361-648x/ac9dda

Title: Lattice distortions and the metal–insulator transition in pure and Ti-substituted Ca₃Ru₂O₇

Journal Article · Tue Nov 08 00:00:00 EST 2022 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648x/ac9dda· OSTI ID:1974384

^[1]; Rao, T. Durga ^[2]; Zafar, A. ^[1]; Abeykoon, A. M. Milinda ^[3];

^[4]; Peng, J. ^[5]; Mao, Z. Q. ^[6]; Ke, X. ^[4]

Central Michigan Univ., Mount Pleasant, MI (United States)
Central Michigan Univ., Mount Pleasant, MI (United States); Gandhi Institute of Technology and Management (GITAM) (India)
Brookhaven National Lab. (BNL), Upton, NY (United States). Photon Sciences Division
Michigan State Univ., East Lansing, MI (United States)
Southeast Univ., Nanjing (China)
Pennsylvania State Univ., University Park, PA (United States)

Here, we report pair distribution function studies on the relationship between the metal–insulator transition (MIT) and lattice distortions in pure and Ti-substituted bilayer Ca₃Ru₂O₇. Structural refinements performed as a function of temperature, magnetic field and length scale reveal the presence of lattice distortions not only within but also orthogonal to the bilayers. Because of the distortions, the local and average crystal structure differ across a broad temperature region extending from room temperature to temperatures below the MIT. The coexistence of distinct lattice distortions is likely to be behind the marked structural flexibility of Ca₃Ru₂O₇ under external stimuli. This observation highlights the ubiquity of lattice distortions in an archetypal Mott system and calls for similar studies on other families of strongly correlated materials.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Central Michigan Univ., Mount Pleasant, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0012704; SC0021973; SC0019259; DMR 1917579

OSTI ID:: 1974384

Alternate ID(s):: OSTI ID: 1991766

Report Number(s):: BNL-224397-2023-JAAM

Journal Information:: Journal of Physics. Condensed Matter, Vol. 35, Issue 1; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Lattice distortions and the metal–insulator transition in pure and Ti-substituted Ca3Ru2O7

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