YbRh2Si2在极低温度下通过量子临界点的热导率
Thermal conductivity through the quantum critical point in YbRh2Si2 at very low temperature
摘要：
在基面磁场下测量了YbRh_2Si_2的热导率，温度低至很低。一个额外的通道热传输出现低于30 mK，无论是在反铁磁和顺磁状态，分别低于和高于临界场抑制磁秩序。这排除了反铁磁振子作为这种额外贡献的起源热导率。此外，这一低温的贡献占上风的有效性或违反的Wiedemann-Franz定律在场诱导量子临界点的明确结论。在高温下的顺磁状态下，热导率是敏感的铁磁波动，以前观察到的NMR或中子散射和所需的急剧的电子自旋共振断裂的发生。
英文摘要：
The thermal conductivity of YbRh2Si2 has been measured down to very low temperatures under field in the basal plane. An additional channel for heat transport appears below 30 mK, both in the antiferromagnetic and paramagnetic states, respectively below and above the critical field suppressing the magnetic order. This excludes antiferromagnetic magnons as the origin of this additional contribution to thermal conductivity. Moreover, this low temperature contribution prevails a definite conclusion on the validity or violation of the Wiedemann-Franz law at the field-induced quantum critical point. At high temperature in the paramagnetic state, the thermal conductivity is sensitive to ferromagnetic fluctuations, previously observed by NMR or neutron scattering and required for the occurrence of the sharp electronic spin resonance fracture.
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