| Autor: |
K, Grube, L, Pintschovius, F, Weber, J-P, Castellan, S, Zaum, S, Kuntz, P, Schweiss, O, Stockert, S, Bachus, Y, Shimura, V, Fritsch, H V, Löhneysen |
| Rok vydání: |
2018 |
| Zdroj: |
Physical review letters. 121(8) |
| ISSN: |
1079-7114 |
| Popis: |
The heavy-fermion compound CeCu_{6-x}Au_{x} has become a model system for unconventional magnetic quantum criticality. For small Au concentrations 0≤x0.16, the compound undergoes a structural transition from orthorhombic to monoclinic crystal symmetry at a temperature T_{s} with T_{s}→0 for x≈0.15. Antiferromagnetic order sets in close to x≈0.1. To shed light on the interplay between quantum-critical magnetic and structural fluctuations we performed neutron-scattering and thermodynamic measurements on samples with 0≤x≤0.3. The resulting phase diagram shows that the antiferromagnetic and monoclinic phase coexist in a tiny Au concentration range between x≈0.1 and 0.15. The application of hydrostatic and chemical pressure allows us to clearly separate the transitions from each other and to explore a possible effect of the structural transition on the magnetic quantum-critical behavior. Our measurements demonstrate that at low temperatures the unconventional quantum criticality exclusively arises from magnetic fluctuations and is not affected by the monoclinic distortion. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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