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Towards a model of a dynamical Jahn-Teller coupling at very low temperatures in Tb 2 Ti 2 O 7

Pierre Bonville 1, * A. Gukasov 2 I. Mirebeau 2 S. Petit 2
* Corresponding author
1 LNO - Laboratoire Nano-Magnétisme et Oxydes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : We present an interpretation of zero-field energy integrated (" diffuse ") neutron scattering and of high-field magnetization data at very low temperature in the frustrated pyrochlore system Tb 2 Ti 2 O 7. This material has antiferromagnetic exchange interactions, and it is expected to have an Ising character at low temperature. Contrary to expectations, it shows no magnetic ordering down to 0.05 K, being thus labeled a " spin liquid. " However, the ground state in Tb 2 Ti 2 O 7 is not a mere fluctuating moment paramagnet but, as demonstrated by very recent experiments, a state where the electronic degrees of freedom are hybridized with the phononic variables in an unconventional way. We show here that, by approximating this complex and still unraveled electron-phonon interaction by a dynamic Jahn-Teller coupling, one can account rather well for the diffuse neutron scattering and the low-temperature isothermal magnetization.
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Pierre Bonville, A. Gukasov, I. Mirebeau, S. Petit. Towards a model of a dynamical Jahn-Teller coupling at very low temperatures in Tb 2 Ti 2 O 7. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2014, 89 (8), pp.85115. ⟨10.1103/PhysRevB.89.085115⟩. ⟨cea-01377056⟩

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