Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.236402
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Funding
- Japanese Society for the Promotion of Science (JSPS) [23340099, 23740263]
- Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT) [20102006]
- MEXT through the Nanoscience and Quantum Physics Project of the Tokyo Institute of Technology
- Grants-in-Aid for Scientific Research [23740263, 23340099] Funding Source: KAKEN
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The thermal conductivity measurements are performed on the heavy-fermion compound YbRh2Si2 down to 0.04 K and under magnetic fields through a quantum critical point (QCP) at B-c = 0.66 T parallel to c axis. In the limit as T -> 0, we find that the Wiedemann-Franz law is satisfied within experimental error at the QCP despite the destruction of the standard signature of Fermi liquid. Our results place strong constraints on models that attempt to describe the nature of the unconventional quantum criticality of YbRh2Si2.
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