Evidence for monoclinic distortion in the ground state phase of underdoped La1.95Sr0.05CuO4: A single crystal neutron diffraction study

被引：4

作者：

Singh, Anar ^{[1
,5
]}

Schefer, Juerg ^{[1
]}

Sura, Ravi ^{[1
,2
]}

Conder, Kazimierz ^{[3
]}

Sibille, Romain F. ^{[3
]}

Ceretti, Monica ^{[4
]}

Frontzek, Matthias ^{[1
,6
]}

Paulus, Werner ^{[4
]}

机构：

[1] Paul Scherrer Inst, Lab Neutron Scattering & Imaging LNS, CH-5232 Villigen, Switzerland

[2] Univ Rennes 1, Sci Chim Rennes, UMR 6226, Campus Beaulieu, F-35042 Rennes, France

[3] Paul Scherrer Inst, Lab Sci Dev & Novel Mat LDM, CH-5232 Villigen, Switzerland

[4] Univ Montpellier, CNRS, Inst Charles Gerhardt, UMR 5253, F-34095 Montpellier, France

[5] Inst Chem Technol, Dept Phys, Mumbai 400019, Maharashtra, India

[6] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2016年 / 119卷 / 12期

关键词：

MAGNETIC FLUCTUATIONS; SUPERCONDUCTIVITY; EXCITATIONS; LA2CUO4; LA2-XSR(X)CUO4; LA2-XBAXCUO4; LA2-XSRXCUO4; PURE;

D O I：

10.1063/1.4944797

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. Our results on symmetry changes are crucial for the interpretation of physical properties also in other high temperature superconductors with similar structures. (C) 2016 AIP Publishing LLC.

引用

页数：8

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