Emergent order in the spin-frustrated system DyxTb2-xTi2O7 studied by ac susceptibility measurements

Abstract

We report the a.c. susceptibility study of Dy_xTb_{2-x}Ti_2O_7 with x in [0, 2]. In addition to the single-ion effect at Ts (single-ion effect peak temperature) corresponding to the Dy3+ spins as that in spin ice Dy_2Ti_2O_7 and a possible spin freezing peak at Tf (Tf < 3 K), a new peak associated with Tb^{3+} is observed in ${\chi }_{ac}(T)$ at nonzero magnetic field with a characteristic temperature T^* (Tf < T^* < Ts). T^* increases linearly with x in a wide composition range (0 < x < 1.5 at 5 kOe). Both application of a magnetic field and increasing doping with Dy3+ enhance T^*. The T^* peak is found to be thermally driven with an unusually large energy barrier as indicated from its frequency dependence. These effects are closely related to the crystal field levels, and the underlying mechanism remains to be understood.

7 pages, 5 figures

References in corpus (12)

• Magnetic Pyrochlore Oxides
• Magnetic Charge Transport
• Dynamically-Induced Frustration as a Route to a Quantum Spin Ice State in Tb2Ti2O7 via Virtual Crystal Field Excitations and Quantum Many-Body Effects
• Low Temperature Spin Freezing in Dy2Ti2O7 Spin Ice
• Observation of Magnetic Monopoles in Spin Ice
• Phonon and crystal field excitations in geometrically frustrated rare earth titanates
• Field Induced Order and Spin Waves in the Pyrochlore Antiferromagnet Tb2Ti2O7
• Quantum and thermal spin relaxation in diluted spin ice: Dy(2-x)MxTi2O7 (M = Lu, Y)
• Non-monotonic zero point entropy in diluted spin ice
• Proposal for a [111] Magnetization Plateau in the Spin Liquid State of Tb2Ti2O7
• Field induced spin ice like orders in spin liquid Tb${}_2$Ti${}_2$O${}_7$
• Two geometrically frustrated magnets studied by neutron diffraction

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• Non-monotonic residual entropy in diluted spin ice: a comparison between Monte Carlo simulations of diluted dipolar spin ice models and experimental results
• Enhancement of ferroelectricity in Cr-doped Ho_2Ti_2O_7
• Experimental observation of magnetoelectricity in spin ice Dy${}_2$Ti${}_2$O${}_7$
• Anisotropic paramagnetism of monoclinic Nd2Ti2O7 single crystals
• Electronic structure by X-ray absorption spectroscopy and observation offield induced unusually slowspin relaxation from magnetic properties in pyrochlore Eu${}_{2-x}$Fe${}_x$Ti${}_2$O${}_7$