Magnetic field-tuned quantum criticality in a Kondo insulator
Magnetic field-tuned quantum criticality in a Kondo insulator
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发表时间：
2019
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通讯作者：
S. Kushwaha;M. Chan;Joon-Kju Park;S. Thomas;Eric;D. Bauer;J. Thompson;F. Ronning;P. Rosa;N. Harrison
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作者：
S. Kushwaha;M. Chan;Joon-Kju Park;S. Thomas;Eric;D. Bauer;J. Thompson;F. Ronning;P. Rosa;N. Harrison
近藤绝缘体预计会在外加磁场下发生绝缘体到金属的转变，但迄今为止所需的极高磁场阻止了对这种转变性质的全面调查。在这里，我们表明，Ce3Bi4Pd3为这项调查提供了一个理想的平台，由于不寻常的小磁场的Bc 11 T需要克服其近藤绝缘间隙。以上Bc，我们发现一个磁场诱导的费米液体状态，其特征能量标度TFL崩溃Bc附近的磁场调谐的量子临界点的方式表示。与近藤单线态形成过程建立了直接联系，该过程在弱磁场中产生磁化率作为温度的函数的宽最大值，随着T → 0，该最大值逐渐演变为Bc处的更尖锐的转变。
Kondo insulators are predicted to undergo an insulator-to-metal transition under applied magnetic field, yet the extremely high fields required to date have prohibited a comprehensive investigation of the nature of this transition. Here we show that Ce3Bi4Pd3 provides an ideal platform for this investigation, owing to the unusually small magnetic field of Bc ≈ 11 T required to overcome its Kondo insulating gap. Above Bc, we find a magnetic field-induced Fermi liquid state whose characteristic energy scale TFL collapses near Bc in a manner indicative of a magnetic field-tuned quantum critical point. A direct connection is established with the process of Kondo singlet formation, which yields a broad maximum in the magnetic susceptibility as a function of temperature in weak magnetic fields that evolves progressively into a sharper transition at Bc as T → 0.