Quasi-local critical nature of cooperative paramagnetic fluctuations in CaRuO${}_3$ metal

Abstract

We report new observation of cooperative paramagnetic fluctuations of Ru${}^{4+}$ spins that coexist with the non-Fermi liquid state in CaRuO${}_3$ perovskite below T $\simeq$ 22 K. Detailed electrical, magnetic and neutron scattering measurements reveal that the Ru${}^{4+}$ ions reside in magnetic field independent random domains with dynamic properties that are reminiscent of the cooperative paramagnetic fluctuations. The linear ($E/T$) scaling of the dynamic susceptibilities and divergence of the mean relaxation time as $T$$\to$~0 K suggest quasi-local critical nature of the spin fluctuations. We argue that the non-Fermi liquid behavior arises due to the quantum critical nature of the cooperative paramagnetic fluctuations in CaRuO${}_3$

5 pages, 4 figures

References in corpus (4)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Strong electronic correlations from Hund's coupling
• Low-energy electronic properties of clean CaRuO${}_3$: elusive Landau quasiparticles
• Field-induced quantum fluctuations in the heavy fermion superconductor CeCu2Ge2

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• The anomalous magnetic properties of $CaRu{O}_3$ probed by AC and DC magnetic measurements and by low Ti impurity doping
• Near-room-temperature ferrimagnetism and half-metallicity in disordered Ca1.5La0.5MnRuO6
• Quantum magnetic properties and metal-to-insulator transition in chemically doped calcium ruthenate perovskite
• Quantum continuum fluctuations in glassy perovskite Ca(Co${}_{0.15}$Ru${}_{0.85}$)O${}_3$
• Evidence of the impurity spin coupling with quantum paraelectric fluctuations in CaTi1-xRuxO3