Abstract
Transition-metal oxides provide an excellent platform to generate ground states by tuning the various degrees of freedom via stimuli such as chemical doping. By investigating the electrical, magnetic, and thermodynamic properties of several compositions of the bilayered ${\mathrm{Sr}}_{3}{({\mathrm{Ru}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x})}_{2}{\mathrm{O}}_{7}$ with $x$ \ensuremath{\ge} 0.36, we complete its $x$-T phase diagram and unveil a spin-glass regime. Upon Mn doping, the ground state of the system changes from the short-range antiferromagnetically (AFM) coupled metal $(0\ensuremath{\le}x\ensuremath{\le}0.05)$ to the E-type AFM-ordered insulator $(0.05<x\ensuremath{\le}0.20)$ to the spin-glass insulator $(0.20<x\ensuremath{\le}0.66)$ to the canted AFM-ordered insulator $(x\ensuremath{\sim}1.0)$. The complex evolution of the magnetic ground state results from the competition between AFM and ferromagnetic (FM) interactions. The peculiar spin-glass state between two long-range magnetically ordered states implies the significance of spin disorder induced by the intermixing of Mn and Ru ions with the lowest transition temperature for Ru : Mn \ensuremath{\sim} 1:1 ($x\ensuremath{\sim}0.5$).
Highlights
Correlated transition-metal oxides (TMOs) have attracted considerable interest due to the abundance of exciting physical phenomena arising from the strong interactions between charge, lattice, orbital, and spin degrees of freedom
The as-grown samples were annealed in an oxygen atmosphere at 550–600 ◦C for 6 wk
The magnetization measurements were performed in a magnetic properties measurement system (MPMS-7 T, Quantum Design), and the electrical transport and specific heat measurements were performed in a physical properties measurement system
Summary
Correlated transition-metal oxides (TMOs) have attracted considerable interest due to the abundance of exciting physical phenomena arising from the strong interactions between charge, lattice, orbital, and spin degrees of freedom. ∞) is widely known for intriguing physical properties such as Mott metal-insulator transition (MIT), unconventional superconductivity, inherently competing magnetic interactions, and field-induced quantum criticality [1,2,3,4,5]. In this series, the bilayered Sr3Ru2O7 (n = 2) crystallizes in a slightly distorted tetragonal lattice structure, as shown, that consists of two layers of RuO6 octahedra planes stacked along the c axis. Our complete magnetic phase diagram covering 0 x 1 allows us to understand the underlying physics of Sr3(Ru1−xMnx )2O7 thoroughly by considering multiple magnetic interactions
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