In YbRh2Si2, the transitions to a heavy Fermi-liquid state and to a magnetic phase occur at a single quantum critical point. But under chemical pressure, these transitions separate, and a new phase of matter appears in between.
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Senthil, T. Room for one more. Nature Phys 5, 460–461 (2009). https://doi.org/10.1038/nphys1323
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DOI: https://doi.org/10.1038/nphys1323
