Orbital ordering transition in La{sub 4}Ru{sub 2}O{sub 10}.

Journal Article · Fri Sep 27 04:00:00 EDT 2002 · Science

DOI:https://doi.org/10.1126/science.1075556· OSTI ID:961078

Khalifah, P; Osborn, R; Huang, Q; Zandbergen, H W; Jin, R; Liu, Y; Mandrus, D; Cava, R J; NIST,; ORNL,

We report experimental evidence for a full orbital ordering transition in the two-dimensional lanthanum ruthenate La{sub 4}Ru{sub 2}O{sub 10}. The observable consequences of this orbital ordering include the loss of the Ru local moment, a structural distortion which partitions Ru-O bonds into axially oriented short and long sets, a sharp jump in electrical resistivity, and the opening of a spin gap that is visible in neutron scattering experiments. This is a rare example of a discrete orbital ordering transition in a 4d transition metal oxide and demonstrates that orbital effects can have an influence on the properties of layered ruthenates, a family of compounds that notably includes the p-wave superconductor Sr{sub 2}RuO{sub 4} and the field-tuned quantum critical metamagnet Sr{sub 3}Ru{sub 2}O{sub 7}.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 961078
• Report Number(s): ANL/MSD/JA-44425
• Journal Information: Science, Journal Name: Science Journal Issue: 5590 ; Sep. 27, 2002 Vol. 297; ISSN 0193-4511; ISSN SCEHDK
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL BONDS
ELECTRIC CONDUCTIVITY
ELECTRONIC STRUCTURE
LANTHANUM OXIDES
PHASE TRANSFORMATIONS
RUTHENIUM OXIDES
SPIN