Pronounced interplay between intrinsic phase-coexistence and octahedral tilt magnitude in hole-doped lanthanum cuprates.

Autor: Tidey JP; Department of Chemistry, University of Warwick, Gibbet Hill, Coventry, CV4 7AL, UK., Liu EP; Department of Physics, Tamkang University, Tamsui, 25137, Taiwan.; Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei, 10617, Taiwan., Lai YC; National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan., Chuang YC; National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan., Chen WT; Center for Condensed Matter Sciences and Center of Atomic Initiative for New Materials, National Taiwan University, Taipei, 10617, Taiwan.; Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei, 10622, Taiwan., Cane LJ; H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK., Lester C; H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK., Petsch AND; H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK., Herlihy A; Department of Chemistry, University of Warwick, Gibbet Hill, Coventry, CV4 7AL, UK.; ISIS Neutron and Muon Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK., Simonov A; Department of Materials (Multifunctional Ferroic Materials), ETH Zürich, Vladimir-Prelog-Weg-5/10, 8093, Zurich, Switzerland., Hayden SM; H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK., Senn M; Department of Chemistry, University of Warwick, Gibbet Hill, Coventry, CV4 7AL, UK. m.senn@warwick.ac.uk.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 Aug 22; Vol. 12 (1), pp. 14343. Date of Electronic Publication: 2022 Aug 22.
DOI: 10.1038/s41598-022-18574-1
Abstrakt: Definitive understanding of superconductivity and its interplay with structural symmetry in the hole-doped lanthanum cuprates remains elusive. The suppression of superconductivity around 1/8th doping maintains particular focus, often attributed to charge-density waves (CDWs) ordering in the low-temperature tetragonal (LTT) phase. Central to many investigations into this interplay is the thesis that La 1.875 Ba 0.125 CuO 4 and particularly La 1.675 Eu 0.2 Sr 0.125 CuO 4 present model systems of purely LTT structure at low temperature. However, combining single-crystal and high-resolution powder X-ray diffraction, we find these to exhibit significant, intrinsic coexistence of LTT and low-temperature orthorhombic domains, typically associated with superconductivity, even at 10 K. Our two-phase models reveal substantially greater tilting of CuO 6 octahedra in the LTT phase, markedly buckling the CuO 2 planes. This would couple significantly to band narrowing, potentially indicating a picture of electronically driven phase segregation, reminiscent of optimally doped manganites. These results call for reassessment of many experiments seeking to elucidate structural and electronic interplay at 1/8 doping.
(© 2022. The Author(s).)
Databáze: MEDLINE
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