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Unusual Heavy-mass Nearly Ferromagnetic State with a Surprisingly Large Wilson Ratio in Double Layered Ruthenates (Sr1-xCax)3Ru2O7

Published

Author(s)

Z Qu, L Spinu, H Q. Yuan, V Dobrosavljevic, Wei Bao, Jeffrey Lynn, M Nicklas, J Peng, T J. Liu, F Fobes, E Flesch, Z Q. Mao

Abstract

We report a very unusual heavy-mass nearly ferromagnetic state with a surprisingly large Wilson ratio Rw (e.g., Rw 700 for x = 0.2) in double layered ruthenates (Sr1- xCax)3Ru2O7. This state does not evolve into a long-range ferromagnetic order despite considerably strong ferromagnetic correlations, but freezes into a cluster-spin-glass at low temperatures; this seems surprising for a bulk material. In addition, the evidence of non- Fermi liquid behavior is observed as the frozen temperature of the cluster-spin-glass approaches zero near x ≅ 0.1. We discuss the origin of such a unique magnetic state from the Fermi surface information probed by Hall effect measurements.
Citation
Physical Review Letters
Volume
78
Issue
18

Keywords

crystal structure, neutron diffraction, magnetic phase transition, single crystal, spin-valve

Citation

Qu, Z. , Spinu, L. , Yuan, H. , Dobrosavljevic, V. , Bao, W. , Lynn, J. , Nicklas, M. , Peng, J. , Liu, T. , Fobes, F. , Flesch, E. and Mao, Z. (2008), Unusual Heavy-mass Nearly Ferromagnetic State with a Surprisingly Large Wilson Ratio in Double Layered Ruthenates (Sr<sub>1-x</sub>Ca<sub>x</sub>)<sub>3</sub>Ru<sub>2</sub>O<sub>7</sub>, Physical Review Letters, [online], https://doi.org/10.1103/PhysRevB.78.180407, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=610062 (Accessed April 15, 2024)
Created November 14, 2008, Updated March 22, 2024