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Exotic transition in the three-dimensional spin-liquid candidate Tb_2Ti_2O_7

机译:三维自旋候选液Tb_2Ti_2O_7的外来跃迁

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摘要

The insulator pyrochlore Tb_2Ti_2O_7 is a three-dimensional spin liquid candidate: the strength of the magnetic interaction would normally induce order at ≈20 K, but according to published muon-spin relaxation and neutron diffraction measurements, it is still in a correlated paramagnetic state down to a temperature of 0.05 K. Our detailed experimental investigation shows that an exotic transition takes place at T_t, = 0.15 (2) K. It is characterized by an anomaly in the muon precession frequency shift but not in the specific heat, which nevertheless reveals the signature of degrees of freedom at very low energy. It might be associated with a cooperative Jahn-Teller transition. The robustness of the experimental results is discussed.
机译:绝缘子烧绿石Tb_2Ti_2O_7是一种三维自旋液体候选物:磁性相互作用的强度通常会在≈20K时引起有序化,但是根据公布的μ子自旋弛豫和中子衍射测量,其仍处于相关的顺磁态下到0.05 K的温度。我们的详细实验研究表明,在T_t = 0.15(2)K处发生了奇异的跃迁。其特征是μ子进动频移异常,但比热异常,这表明低能量下自由度的标志。它可能与合作的Jahn-Teller过渡有关。讨论了实验结果的鲁棒性。

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