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

Published

November 14, 2008

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 (Sr_{1- x}Ca_x)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

Pub Type

Journals

Download Paper

https://doi.org/10.1103/PhysRevB.78.180407

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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_1-xCa_x)₃Ru₂O₇, Physical Review Letters, [online], https://doi.org/10.1103/PhysRevB.78.180407, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=610062 (Accessed October 11, 2025)