Strange-metal behaviour in a pure ferromagnetic Kondo lattice.

Nature
Bin ShenHuiqiu Yuan

Abstract

A wide range of metals exhibit anomalous electrical and thermodynamic properties when tuned to a quantum critical point (QCP), although the origins of such strange metals have posed a long-standing mystery. The frequent association of strange metals with unconventional superconductivity and antiferromagnetic QCPs1-4 has led to the belief that they are highly entangled quantum states5. By contrast, ferromagnets are regarded as an unlikely setting for strange metals, because they are weakly entangled and their QCPs are often interrupted by competing phases or first-order phase transitions6-8. Here we provide evidence that the pure ferromagnetic Kondo lattice9,10 CeRh6Ge4 becomes a strange metal at a pressure-induced QCP. Measurements of the specific heat and resistivity under pressure demonstrate that the ferromagnetic transition is continuously suppressed to zero temperature, revealing a strange-metal behaviour around the QCP. We argue that strong magnetic anisotropy has a key role in this process, injecting entanglement in the form of triplet resonating valence bonds into the ordered ferromagnet. We show that a singular transformation in the patterns of the entanglement between local moments and conduction electrons, from tripl...Continue Reading

References

May 16, 1994·Physical Review Letters·H v LöhneysenT Trappmann
Oct 3, 2000·Nature·A SchroderP Coleman
Apr 20, 2004·Physical Review Letters·Andrey V ChubukovJerome Rech
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Aug 28, 2010·Proceedings of the National Academy of Sciences of the United States of America·Seiji J Yamamoto, Qimiao Si
May 15, 2018·Physical Review Letters·Yashar Komijani, Piers Coleman
Jul 10, 2019·Physical Review Letters·Yashar Komijani, Piers Coleman

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Citations

Apr 28, 2020·Physical Review Letters·T R Kirkpatrick, D Belitz
Aug 29, 2020·Physical Review Letters·Piers ColemanElio J König

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Methods Mentioned

BETA
electron scattering
X-ray

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