Evidence for monoclinic distortion in the ground state phase of underdoped La1.95Sr0.05CuO4: A single crystal neutron diffraction study
[2];
[5];
- Paul Scherrer Inst. (PSI), Villigen (Switzerland); Institute of Chemical Technology, Mumbai (India)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland); Univ. de Rennes, Rennes (France)
- UMR 5253 CNRS - Univ. de Montpellier, Montpellier (France)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1333646
- Journal Information:
- Journal of Applied Physics, Vol. 119, Issue 12; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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