Observation of a Metallic Antiferromagnetic Phase and Metal to Nonmetal Transition in Ca{sub 3}Ru{sub 2}O{sub 7}

Journal Article · Sat Mar 01 00:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.1751· OSTI ID:467456

Cao, G; McCall, S; Crow, J ^[1]; Guertin, R ^[2]

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1. National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306 (United States)
2. Physics Department, Tufts University, Medford, Massachusetts 02155 (United States)

Single crystal Ca{sub 3}Ru{sub 2}O{sub 7} shows a metallic antiferromagnetic phase intermediate between a first-order metal to nonmetal transition at T{sub M}=48K and the antiferromagnetic ordering (N{acute e}el) temperature, T{sub N}=56K. The metallic antiferromagnetic phase is predicted within various Mott-Hubbard models. Magnetization and electrical resistivity reveal strongly anisotropic metamagnetism in the nonmetallic antiferromagnetic phase. The charge and spin excitations are strongly coupled: The H-T phase diagrams determined by magnetization and magnetoresistivity are indistinguishable and reveal a multicritical point. The heat capacity of Ca{sub 3}Ru{sub 2}O{sub 7} suggests it is a highly correlated electron system. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 467456
• Journal Information: Physical Review Letters, Vol. 78, Issue 9; Other Information: PBD: Mar 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
RUTHENIUM OXIDES
MAGNETIZATION
CALCIUM OXIDES
MAGNETIC SUSCEPTIBILITY
ELECTRIC CONDUCTIVITY
TEMPERATURE DEPENDENCE
MAGNETORESISTANCE
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
ANTIFERROMAGNETISM
MONOCRYSTALS
SPECIFIC HEAT