Affiliation:
1. Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany.
2. Institute of Physics, Goethe University Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany.
Abstract
Arsenic Makes a Difference
A quantum critical point (QCP) occurs when quantum fluctuations, which do not go away even at absolute zero, cause a gradual (so-called second order) phase change. QCPs have been observed in ferromagnets, but for ferromagnetic metals, the evidence is less clear-cut and it is thought that, as the temperature is lowered, another order—such as superconductivity—will prevent the formation of a QCP. However,
Steppke
et al.
(p.
933
), using specific heat and magnetic susceptibility measurements, found strong evidence for a QCP in a quasi–one-dimensional heavy fermion material, YbNi
4
(P
1−
x
As
x
)
2
, near an Arsenic substitution level of about 10%. The results present a challenge to theories about quantum criticality in ferromagnets.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
142 articles.
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