Journal
NATURE MATERIALS
Volume 13, Issue 8, Pages 777-781Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nmat3991
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Funding
- National Basic Research Program of China [2011CBA00103, 2012CB927404]
- National Science Foundation of China [11190023, 11174247, 10934005, 11274084]
- NSF of Zhejiang Province [Z6110033]
- Fundamental Research Funds for the Central Universities of China
- National Science Foundation [DMR 0819860, DMR-1309531]
- Nano Electronics Research Corporation [2010-NE-2010G]
- Robert A. Welch Foundation [C-1411]
- China Scholarship Council [CSC-2010632081]
- Swedish National Infrastructure for Computing (SNIC) [003-11-1, 001-11-125]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1309531] Funding Source: National Science Foundation
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A quantum critical point arises at a continuous transformation between distinct phases of matter at zero temperature. Studies in antiferromagnetic heavy-fermion materials have revealed that quantum criticality has several classes, with an unconventional type that involves a critical destruction of the Kondo entanglement(1,2). To understand such varieties, it is important to extend the materials basis beyond the usual setting of intermetallic compounds. Here we show that a nickel oxypnictide, CeNiAsO, exhibits a heavy-fermion antiferromagnetic quantum critical point as a function of either pressure or P/As substitution. At the quantum critical point, non-Fermi-liquid behaviour appears, which is accompanied by a divergent effective carrier mass. Across the quantum critical point, the low-temperature Hall coefficient undergoes a rapid sign change, suggesting a sudden jump of the Fermi surface and a destruction of the Kondo effect(3,4). Our results imply that the enormous materials basis for the oxypnictides, which has been so crucial in the search for high-temperature superconductivity, will also play a vital role in the effort to establish the universality classes of quantum criticality in strongly correlated electron systems.
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