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Title: Non-Fermi liquid behavior close to a quantum critical point in a ferromagnetic state without local moments

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.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5] ;  [5] ;  [5] ;  [6] ;  [6] ;  [4] ;  [3] ;  [2] ;  [1]
  1. Rice Univ., Houston, TX (United States)
  2. Columbia Univ., New York, NY (United States)
  3. Univ. of California, San Diego, La Jolla, CA (United States)
  4. Florida State Univ., Tallahassee, FL (United States)
  5. McMaster Univ., Hamilton, ON (Canada)
  6. Chinese Academy of Sciences (CAS), Beijing (China)
Publication Date:
Grant/Contract Number:
SC0008832
Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Research Org:
Florida State Univ., Tallahassee, FL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1181592
Alternate Identifier(s):
OSTI ID: 1192979