Structure and physical properties of SrNiRu5O11 single crystals: An R-type ferrite based on ordered kagome nets

Single crystals of the R-type ferrite SrNiRu5O11 were grown from a chloride flux. The hexagonal crystal structure contains ruthenium located on distorted kagome nets. The low-temperature dc magnetic susceptibilities (χ⊥ and χ∥, perpendicular and parallel to the c axis, respectively) diverge as T−0.3...

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Bibliographic Details
Published in:Physical review. B 2017-01, Vol.95 (2), p.024433
Main Authors: Shlyk, L, De Long, L E, Niewa, R
Format: Article
Language:English
Subjects:
Crystal structure
Fermi liquids
Ferrites
Kagome lattice
Liquid phases
Magnetoresistivity
Physical properties
Ruthenium
Single crystals
Topological insulators
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Summary:Single crystals of the R-type ferrite SrNiRu5O11 were grown from a chloride flux. The hexagonal crystal structure contains ruthenium located on distorted kagome nets. The low-temperature dc magnetic susceptibilities (χ⊥ and χ∥, perpendicular and parallel to the c axis, respectively) diverge as T−0.3, and do not exhibit any indication of long-range magnetic order down to 4.5 K. The electrical resistivity varies as T1.6 below 40 K, which is typical of non-Fermi liquids, and may originate from a competition between residual magnetic interactions among Ni2+ (S=1) spins and geometrical frustration on the two-dimensional kagome lattice of Ru3+ (S=½) spins. The transverse magnetoresistivity ρxy at constant temperature T=5K for current (J) -magnetic field (H) configurations, J⊥H∥c axis and J∥H⊥c axis, reveals no anomalous contribution, which is consistent with the absence of magnetic order. Fits of the specific heat data below 10 K require a dominant, but unusual electronic term of the form Cel=γT1.2, which is expected for massless Dirac fermion states in topological insulators, or spin-liquid phases.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.95.024433