Filling Control of the Mott Insulator Ca2RuO4

Abstract

We have grown single crystals of electron doping system Ca2-xLaxRuO4 (0.00 <= x <= 0.20) by a floating zone method. The first order metal/non-metal transition and canted antiferromagnetic ordering occur for 0.00 < x < 0.15, similar to those in the bandwidth controlled system Ca2-xSrxRuO4 (CSRO). However, comparing with CSRO, we found a rather different metallic ground state adjacent to the non-metallic ground state with canted antiferromagnetic order. Instead of short-range antiferromagnetic correlation found in CSRO (0.20 <= x < 0.50), the metallic ground state of the present system is characterized by strong ferromagnetic correlation.

8 pages, 8 figures (eps), submitted to J. Phys. Soc. Jpn

References in corpus (2)

• The ground state of Sr3Ru2O7 revisited; Fermi liquid close to a ferromagnetic instability
• Destruction of the Mott Insulating Ground State of Ca_2RuO_4 by a Structural Transition

Cited by in corpus (11)

• From Mott insulator to ferromagnetic metal: a pressure study of Ca${}_2$RuO${}_4$
• In-situ strain-tuning of the metal-insulator-transition of Ca${}_2$RuO${}_4$ in angle-resolved photoemission experiments
• Orbital ordering transition in Ca${}_2$RuO${}_4$ observed with resonant x-ray diffraction
• Tuning of the Ru${}^{4+}$ ground-state orbital population in the $4{\mathbf{d}}^4$ Mott insulator Ca${}_2$RuO${}_4$ achieved by La doping
• Persistence of antiferromagnetic order upon La substitution in the $4d^4$ Mott insulator Ca${}_2$RuO${}_4$
• Complex electronic states in double layered ruthenates (Sr1-xCax)3Ru2O7
• Sr${}_2$RuO${}_4$, like doped cuprates and barium bismuthate, is a negative charge-transfer gap even parity superconductor with $\frac{3}{4}$-filled oxygen band
• Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca${}_2$RuO${}_4$
• Emerging new phases in correlated Mott insulator Ca2RuO4
• Competition of three-dimensional magnetic phases in Ca${}_2$Ru${}_{1-x}$Fe${}_x$O${}_4$: A structural perspective
• Metallisation of the Mott Insulator Ca${}_2$RuO${}_4$ using Electric Double-Layer Gating