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Abstract Kondo lattice materials, where localized magnetic moments couple to itinerant electrons, provide a very rich backdrop for strong electron correlations. They are known to realize many exotic phenomena, with a dramatic example being recent observations of quantum oscillations and metallic thermal conduction in insulators, implying the emergence of enigmatic charge-neutral fermions. Here, we show that thermal conductivity and specific heat measurements in insulating YbIr 3 Si 7 reveal emergent neutral excitations, whose properties are sensitively changed by a field-driven transition between two antiferromagnetic phases. In the low-field phase, a significant violation of the Wiedemann-Franz law demonstrates that YbIr 3 Si 7 is a charge insulator but a thermal metal. In the high-field phase, thermal conductivity exhibits a sharp drop below 300 mK, indicating a transition from a thermal metal into an insulator/semimetal driven by the magnetic transition. These results suggest that spin degrees of freedom directly couple to the neutral fermions, whose emergent Fermi surface undergoes a field-driven instability at low temperatures.more » « less
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Murayama, H.; Ishida, K.; Kurihara, R.; Ono, T.; Sato, Y.; Kasahara, Y.; Watanabe, H.; Yanase, Y.; Cao, G.; Mizukami, Y.; et al (, Physical Review X)null (Ed.)
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Wu, S.-F.; Zhang, W.-L.; Thorsmølle, V. K.; Chen, G. F.; Tan, G. T.; Dai, P. C.; Shi, Y. G.; Jin, C. Q.; Shibauchi, T.; Kasahara, S.; et al (, Physical Review Research)
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Sato, Y.; Xiang, Z.; Kasahara, Y.; Taniguchi, T.; Kasahara, S.; Chen, L.; Asaba, T.; Tinsman, C.; Murayama, H.; Tanaka, O.; et al (, Nature Physics)