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Title: Evidence for monoclinic distortion in the ground state phase of underdoped La 1.95Sr 0.05CuO 4: A single crystal neutron diffraction study

The existing controversy about the symmetry of the crystal structure of the ground state of the critical doped La 1.95Sr 0.05CuO 4 has been resolved by analyzing the single crystal neutron diffraction data collected between 5 and 730 K. We observed small but significant intensities for "forbidden" reflections given by extinction rules of the orthorhombic Bmab space group at low temperatures. A careful investigation of neutron diffraction data reveals that the crystal structure of La 1.95Sr 0.05CuO 4 at 5 K is monoclinic with B2/m (2/m 1 1) space group. The monoclinic structure emerges from the orthorhombic structure in a continuous way; however, the structure is stable below similar to 120K which agrees with other observed phenomena. Lastly, our results on symmetry changes are crucial for the interpretation of physical properties also in other high temperature superconductors with similar structures.
Authors:
 [1] ; ORCiD logo [2] ;  [3] ;  [2] ;  [2] ;  [4] ; ORCiD logo [5] ;  [4]
  1. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Institute of Chemical Technology, Mumbai (India)
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  3. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Univ. de Rennes, Rennes (France)
  4. UMR 5253 CNRS - Univ. de Montpellier, Montpellier (France)
  5. Paul Scherrer Inst. (PSI), Villigen (Switzerland); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 12; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 36 MATERIALS SCIENCE; crystal structure; neutron diffraction; single crystals; doping; phase transition
OSTI Identifier:
1333646

Singh, Anar, Schefer, Jurg, Sura, Ravi, Conder, Kazimierz, Sibille, Romain F., Ceretti, Monica, Frontzek, Matthias, and Paulus, Werner. Evidence for monoclinic distortion in the ground state phase of underdoped La1.95Sr0.05CuO4: A single crystal neutron diffraction study. United States: N. p., Web. doi:10.1063/1.4944797.
Singh, Anar, Schefer, Jurg, Sura, Ravi, Conder, Kazimierz, Sibille, Romain F., Ceretti, Monica, Frontzek, Matthias, & Paulus, Werner. Evidence for monoclinic distortion in the ground state phase of underdoped La1.95Sr0.05CuO4: A single crystal neutron diffraction study. United States. doi:10.1063/1.4944797.
Singh, Anar, Schefer, Jurg, Sura, Ravi, Conder, Kazimierz, Sibille, Romain F., Ceretti, Monica, Frontzek, Matthias, and Paulus, Werner. 2016. "Evidence for monoclinic distortion in the ground state phase of underdoped La1.95Sr0.05CuO4: A single crystal neutron diffraction study". United States. doi:10.1063/1.4944797. https://www.osti.gov/servlets/purl/1333646.
@article{osti_1333646,
title = {Evidence for monoclinic distortion in the ground state phase of underdoped La1.95Sr0.05CuO4: A single crystal neutron diffraction study},
author = {Singh, Anar and Schefer, Jurg and Sura, Ravi and Conder, Kazimierz and Sibille, Romain F. and Ceretti, Monica and Frontzek, Matthias and Paulus, Werner},
abstractNote = {The existing controversy about the symmetry of the crystal structure of the ground state of the critical doped La1.95Sr0.05CuO4 has been resolved by analyzing the single crystal neutron diffraction data collected between 5 and 730 K. We observed small but significant intensities for "forbidden" reflections given by extinction rules of the orthorhombic Bmab space group at low temperatures. A careful investigation of neutron diffraction data reveals that the crystal structure of La1.95Sr0.05CuO4 at 5 K is monoclinic with B2/m (2/m 1 1) space group. The monoclinic structure emerges from the orthorhombic structure in a continuous way; however, the structure is stable below similar to 120K which agrees with other observed phenomena. Lastly, our results on symmetry changes are crucial for the interpretation of physical properties also in other high temperature superconductors with similar structures.},
doi = {10.1063/1.4944797},
journal = {Journal of Applied Physics},
number = 12,
volume = 119,
place = {United States},
year = {2016},
month = {3}
}