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High-pressure diffraction studies on Ca 2 RuO 4

High-pressure diffraction studies on Ca 2 RuO 4 We studied the crystal and magnetic structure of Ca 2 RuO 4 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 RuO 6 -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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

High-pressure diffraction studies on Ca 2 RuO 4

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2005 The American Physical Society
ISSN
1550-235X
DOI
10.1103/PhysRevB.72.094104
Publisher site
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Abstract

We studied the crystal and magnetic structure of Ca 2 RuO 4 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 RuO 6 -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.

Journal

Physical Review B – American Physical Society (APS)

Published: Sep 1, 2005

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