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Title: Non-Fermi Liquid Behavior Close to a Quantum Critical Point in a Ferromagnetic State without Local Moments

Journal Article · · Physical Review. X

A quantum critical point (QCP) occurs upon chemical doping of the weak itinerant ferromagnet Sc₃̣₁ In. Remarkable for a system with no local moments, the QCP is accompanied by non-Fermi liquid behavior, manifested in the logarithmic divergence of the specific heat both in the ferro-and the paramagnetic states, as well as linear temperature dependence of the low-temperature resistivity. With doping, critical scaling is observed close to the QCP, as the critical exponents δ, γ, and β have weak composition dependence, with δ nearly twice and β almost half of their respective mean-field values. The unusually large paramagnetic moment μPM ~ 1.3μB/F:U: is nearly composition independent. Evidence for strong spin fluctuations, accompanying the QCP at xc – 0.035 ± 0.005, may be ascribed to the reduced dimensionality of Sc₃̣₁ In, associated with the nearly one-dimensional Sc-In chains.

Research Organization:
Florida State Univ., Tallahassee, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0008832
OSTI ID:
1181592
Alternate ID(s):
OSTI ID: 1192979
Journal Information:
Physical Review. X, Journal Name: Physical Review. X Vol. 5 Journal Issue: 1; ISSN 2160-3308
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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