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23 April 2024 |
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Non-Fermi Liquid Behavior Close to a Quantum Critical Point in a Ferromagnetic State without Local Moments | | E. Svanidze
; L. Liu
; B. Frandsen
; B. D. White
; T. Besara
; T. Goko
; T. Medina
; T. J. S. Munsie
; G. M. Luke
; D. Zheng
; C. Q. Jin
; T. Siegrist
; M. B. Maple
; Y. J. Uemura
; E. Morosan
; | | Date: |
25 Oct 2014 | | Abstract: | A quantum critical point (QCP) occurs upon chemical doping of the weak
itinerant ferromagnet Sc_{3.1}In. Remarkable for a system with no local
moments, the QCP is accompanied by non-Fermi liquid (NFL) behavior, manifested
in the logarithmic divergence of the specific heat both in the ferro- and the
paramagnetic states. Sc_{3.1}In displays critical scaling and NFL behavior in
the ferromagnetic state, akin to what had been observed only in f-electron,
local moment systems. With doping, critical scaling is observed close to the
QCP, as the critical exponents, and delta, gamma and beta have weak composition
dependence, with delta nearly twice, and beta almost half of their respective
mean-field values. The unusually large paramagnetic moment mu_PM~1.3 mu_B/F.U.
is nearly composition-independent. Evidence for strong spin fluctuations,
accompanying the QCP at x_c = 0.035 +- 0.005, may be ascribed to the reduced
dimensionality of Sc_{3.1}In, associated with the nearly one-dimensional Sc-In
chains. | | Source: | arXiv, 1410.6850 | | Services: | Forum | Review | PDF | Favorites | |
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