Complex electronic states in double layered ruthenates (Sr1-xCax)3Ru2O7

Abstract

The magnetic ground state of (Sr${}_{1-x}$Ca${}_x$)${}_3$Ru${}_2$O${}_7$ (0 $\le x\le$ 1) is complex, ranging from an itinerant metamagnetic state (0 $\le x<$ 0.08), to an unusual heavy-mass, nearly ferromagnetic (FM) state (0.08 $<x<$ 0.4), and finally to an antiferromagnetic (AFM) state (0.4 $\le x\le$ 1). In this report we elucidate the electronic properties for these magnetic states, and show that the electronic and magnetic properties are strongly coupled in this system. The electronic ground state evolves from an AFM quasi-two-dimensional metal for $x=$ 1.0, to an Anderson localized state for $0.4\le x<1.0$ (the AFM region). When the magnetic state undergoes a transition from the AFM to the nearly FM state, the electronic ground state switches to a weakly localized state induced by magnetic scattering for $0.25\le x<0.4$, and then to a magnetic metallic state with the in-plane resistivity ${\rho }_{ab}\propto T^{\alpha }$ ($\alpha >$ 2) for $0.08<x<0.25$. The system eventually transforms into a Fermi liquid ground state when the magnetic ground state enters the itinerant metamagnetic state for $x<0.08$. When $x$ approaches the critical composition ($x\sim$ 0.08), the Fermi liquid temperature is suppressed to zero Kelvin, and non-Fermi liquid behavior is observed. These results demonstrate the strong interplay between charge and spin degrees of freedom in the double layered ruthenates.

10 figures. To be published in Phys. Rev. B

References in corpus (3)

• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7
• Borderline magnetism in Sr4Ru3O10: Impact of dilute La and Ca doping on itinerant ferromagnetism and metamagnetism

Cited by in corpus (7)

• Field-induced Orbital Patterns in Ferromagnetic Layered Ruthenates
• Existence of electron and hole pockets and partial gap opening in the correlated semimetal Ca3Ru2O7
• Point defects at cleaved Sr${}_{n+1}$Ru${}_n$O${}_{3n+1}$(001) surfaces
• Hidden Phases Revealed at the Surface of Double-Layered Sr3(Ru1-xMnx)2O7
• The effect of disorder on quantum phase transition in the double layered ruthenates (Sr1-xCax)3Ru2O7
• Evidence for weak antilocalization-weak localization crossover and metal-insulator transition in CaCu${}_3$Ru${}_4$O${}_{12}$ thin films
• Unrestricted Hartree-Fock Analysis of Sr${}_{3-x}$Ca${}_x$Ru${}_2$O${}_7$