Anisotropic uniaxial pressure response of the Mott insulator Ca2RuO4

Abstract

We have investigated the in-plane uniaxial pressure effect on the antiferromagnetic Mott insulator Ca2RuO4 from resistivity and magnetization measurements. We succeeded in inducing the ferromagnetic metallic phase at lower critical pressure than by hydrostatic pressure, indicating that the flattening distortion of the RuO6 octahedra is more easily released under in-plane uniaxial pressure. We also found a striking in-plane anisotropy in the pressure responses of various magnetic phases: Although the magnetization increases monotonically with pressure diagonal to the orthorhombic principal axes, the magnetization exhibits peculiar dependence on pressure along the in-plane orthorhombic principal axes. This peculiar dependence can be explained by a qualitative difference between the uniaxial pressure effects along the orthorhombic a and b axes, as well as by the presence of twin domain structures.

Accepted for publication in Phys. Rev. B

References in corpus (5)

• Evaluation of Spin-Triplet Superconductivity in Sr2RuO4
• Higher-Tc superconducting phase in Sr2RuO4 induced by uniaxial pressure
• Spatial development of superconductivity in the Sr2RuO4-Ru eutectic system
• Origin of the Heavy Fermion Behavior in Ca_{2-x}Sr_{x}RuO_{4}: Roles of Coulomb Interaction and the Rotation of RuO_{6} octahedra
• Competition between spin fluctuations in Ca${}_{2-x}$Sr${}_x$RuO${}_4$ around $x=0.5$

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• Higher-Tc Superconducting Phase in Sr2RuO4 Induced by In-Plane Uniaxial Pressure
• Co-appearance of superconductivity and ferromagnetism in a Ca${}_2$RuO${}_4$ nanofilm crystal
• Piezoelectric-driven uniaxial pressure cell for muon spin relaxation and neutron scattering experiments
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