Filling Control of the Mott Insulator Ca2RuO4

Details Filling Control of the Mott Insulator Ca2RuO4 Filling Control of the Mott Insulator Ca2RuO4

2000-08-23

arxiv.org/abs/cond-mat/0008331v1

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1143/JPSJ.70.460

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.

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