Non-Fermi Liquid Behavior Close to a Quantum Critical Point in a Ferromagnetic State without Local Moments
| Autor: | M. B. Maple, Tiglet Besara, D. Zheng, Theo Siegrist, Changqing Jin, T. Medina, Emilia Morosan, Graeme Luke, Eteri Svanidze, Tatsuo Goko, T. J. S. Munsie, Lian Liu, Yasutomo J. Uemura, Benjamin A. Frandsen, B. D. White |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
Quantum phase transition Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics QC1-999 Doping FOS: Physical sciences General Physics and Astronomy chemistry.chemical_element State (functional analysis) Lutetium Condensed Matter - Strongly Correlated Electrons chemistry Ferromagnetism Quantum mechanics Magnet Quantum critical point Condensed Matter::Strongly Correlated Electrons Fermi liquid theory |
| Zdroj: | Physical Review X, Vol 5, Iss 1, p 011026 (2015) |
| ISSN: | 2160-3308 |
| Popis: | 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. 11 pages, 13 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|