High-pressure diffraction studies on Ca2RuO4 -: art. no. 094104

被引：67

作者：

Steffens, P

Friedt, O

Alireza, P

Marshall, WG

Schmidt, W

Nakamura, F

Nakatsuji, S

Maeno, Y

Lengsdorf, R

Abd-Elmeguid, MM

Braden, M

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] CEA, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[4] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[5] ILL Grenoble, F-38042 Grenoble, France

[6] Hiroshima Univ, ADSM, Dept Quantum Matter, Higashihiroshima 7398530, Japan

[7] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.72.094104

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We studied the crystal and magnetic structure of Ca2RuO4 as function of pressure with different diffraction techniques. The first-order phase transition observed at a moderate pressure of P=0.5 GPa between the insulating and the metallic high-pressure phase is characterized by a broad region of phase coexistence. The following structural changes are observed as function of pressure: (a) A discontinuous change of both the tilt and rotational angle of the RuO6-octahedra at this transition, (b) a gradual decrease of the tilt angle in the high-pressure phase (P>0.5 GPa), and (c) the disappearance of the tilt above 5.5 GPa leading to a higher symmetry structure. The magnetism was studied by single-crystal neutron diffraction: The ferromagnetic component of the high-pressure phase and a rearrangement of antiferromagnetic order in the low-pressure phase have been observed.

引用

页数：7

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