Large exchange bias and low temperature glassy state in frustrated triangular-lattice antiferromagnet Ba${}_3$NiIr${}_2$O${}_9$

Abstract

Here, we report both ac and dc magnetization, thermodynamic and electric properties of hexagonal Ba${}_3$NiIr${}_2$O${}_9$. The Ni${}^{2+}$ (spin-1) forms layered triangular-lattice and interacts antiferromagnetically while Ir${}^{5+}$ is believed to act as magnetic link between the layers. This complex magnetic interaction results in magnetic frustration leading to a spin-glass transition at $T_f$ $\sim$ 8.5 K. The observed magnetic relaxation and aging effect also confirms the nonequilibrium ground state. The system further shows large exchange bias which is tunable with cooling field. Below the Curie-Weiss temperature ${\theta }_{CW}$ ($\sim$ -29 K), the magnetic specific heat $C_m$ displays a broad hump and at low temperature follows $C_m=\gamma T^{\alpha }$ dependence where both $\gamma$ and $\alpha$ show dependence on temperature and magnetic field. A sign change in magnetoresistace is observed which is due to an interplay among magnetic moment, field and spin-orbit coupling.

arXiv comment9 pages, 7 figures, Accepted for publication in Phys. Rev. B

References in corpus (20)

• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Spin-Liquid State in the S = 1/2 Hyperkagome Antiferromagnet Na4Ir3O8
• Ferromagnetic cluster spin-glass behavior in PrRhSn3
• Spin-glass ground state in a triangular-lattice compound YbZnGaO${}_4$
• High pressure sequence of Ba_3NiSb_2O_9 structural phases: new $S=1$ quantum spin-liquids based on Ni^{2+}
• Novel magnetism of Ir5+ ions in the double perovskite Sr2YIrO6
• Quantum Spin Ice Dynamics in the Dipole-Octupole Pyrochlore Magnet Ce${}_2$Zr${}_2$O${}_7$
• Successive magnetic phase transitions and multiferroicity in Spin-1 triangular lattice antiferromagnet Ba${}_3$NiNb${}_2$O${}_9$
• NaIrO3 - A pentavalent post-perovskite
• Enhanced weak ferromagnetism and conductivity in hole-doped pyrochlore iridate Y2Ir2O7
• Spin-orbital liquid state assisted by singlet-triplet excitation in $J=0$ ground state of Ba${}_3$ZnIr${}_2$O${}_9$
• The interparticle interaction and crossover in critical lines on field-temperature plane in Pr${}_{0.5}$Sr${}_{0.5}$MnO${}_3$ nanoparticles
• Quantum Magnetization Plateau in Spin-1 Triangular-Lattice Antiferromagnet Ba${}_3$NiSb${}_2$O${}_9$
• Evolution of structure, magnetism and electronic transport in doped pyrochlore iridate Y${}_2$Ir${}_{2-x}$Ru${}_x$O${}_7$
• Gapless quantum spin liquid in the triangular system Sr${}_3$CuSb${}_2$O${}_9$
• Synthesis and electronic properties of Ruddlesden-Popper strontium iridate epitaxial thin films stabilized by control of growth kinetics
• Lattice distortion effects on the frustrated spin-1 triangular-antiferromagnet A3NiNb2O9 (A = Ba, Sr and Ca)
• Unconventional spin freezing and fluctuations in the frustrated antiferromagnet NiGa2S4
• Effect of Cu${}^{2+}$ substitution in Spin-Orbit Coupled Sr${}_2$Ir${}_{1-x}$Cu${}_x$O${}_4$: Structure, magnetism and electronic properties
• Insulating phase in Sr${}_2$IrO${}_4$: An investigation using critical analysis and magnetocaloric effect

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