Possible spin frustration in Nd${}_2$Ti${}_2$O${}_7$ probed by muon spin relaxation

Abstract

Muon spin relaxation on Nd${}_2$Ti${}_2$O${}_7$ (NTO) and NdLaTi${}_2$O${}_7$ (NLTO) compounds are presented. The time spectra for both compounds are as expected for the paramagnetic state at high temperatures, but deviate from the exponential function below about 100 K. The muon spin relaxation rate increases with decreasing temperature firstly, and then levels off below about 10 K, which is reminiscent of the frustrated systems. An enhancement of the relaxation rate by a longitudinal field in the paramagnetic state is observed for NTO, and eliminated by a magnetic dilution for the NLTO sample. This suggests that the spectral density is modified by a magnetic dilution and thus indicates that the spins behave cooperatively rather than individually. Zero-field measurement at 0.3 K indicates that the magnetic ground state for NTO is ferromagnetic.

References in corpus (14)

• Magnetic Monopoles in Spin Ice
• Magnetic Pyrochlore Oxides
• Stretched Exponential Relaxation Arising from a Continuous Sum of Exponential Decays
• Magnetic Charge Transport
• Spin Correlations in Ho${}_2$Ti${}_2$O${}_7$: a Dipolar Spin Ice System
• Muon spin rotation and relaxation in magnetic materials
• Spin dynamics and magnetic order in magnetically frustrated Tb2Sn2O7
• Spin Ice: Magnetic Excitations without Monopole Signatures using Muon Spin Rotation
• Direct evidence for a dynamical ground state in the highly frustrated Tb${}_2$Sn${}_2$O${}_7$ pyrochlore
• Magnetic dilution in the geometrically frustrated SrCr${}_{9p}$Ga${}_{12-9p}$O${}_{19}$ and the role of local dynamics: a $\mu$SR study
• Muon Spin Relaxation and Susceptibility Studies of Pure and Doped Spin 1/2 Kagomé-like system (Cu${}_x$Zn${}_{1-x}$)${}_3$V${}_2$O${}_7$(OH)${}_2$ 2H${}_2$O
• Monopoles, magnetricity and the stray field from spin ice
• Probing exotic spin correlations by Muon Spin depolarization measurements with applications to spin glass dynamics
• Anisotropic paramagnetism of monoclinic Nd2Ti2O7 single crystals

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