Journal
PHYSICAL REVIEW B
Volume 80, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.193103
Keywords
calcium compounds; ferromagnetic materials; giant magnetoresistance; magnetic anisotropy; metal-insulator transition
Funding
- MEXT of Japan [20029017]
- Grants-in-Aid for Scientific Research [20029017] Funding Source: KAKEN
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We have observed an anisotropic and giant magnetoresistance (MR) in the 4d-electron Mott transition system of Ca2RuO4. On the border of the Mott transition (similar to 2 GPa), the MR effect at similar to 10 T reaches similar to-55% at T-C for longitudinal and similar to+120% at low temperatures for the transverse effects. The negative MR is most likely interpreted as a reduction in a ferromagnetic (FM) fluctuation at T-C. In contrast, the large positive effect is actually rare and is characteristic of the mixed state where the FM metallic islands are flecked with the insulating phases. We discuss the reason of the peculiar MR from the viewpoint of the anisotropic magnetism, the tunnel MR, and the orbital physics..
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