Neutron scattering measurements of spin fluctuations in the heavy-fermion systemUPt3

1987 ◽  
Vol 36 (16) ◽  
pp. 8523-8529 ◽  
Author(s):  
A. I. Goldman ◽  
G. Shirane ◽  
G. Aeppli ◽  
E. Bucher ◽  
J. Hufnagl
Keyword(s):  
Neutron Scattering ◽  
Heavy Fermion ◽  
Spin Fluctuations ◽  
Scattering Measurements

QUANTUM CRITICAL FLUCTUATIONS IN HEAVY FERMION COMPOUNDS

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3031-3036 ◽  
Author(s):  
A. SCHROEDER ◽  
G. AEPPLI ◽  
P. COLEMAN ◽  
R. RAMAZASHVILI ◽  
R. COLDEA ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Heavy Fermion ◽  
Magnetic Moments ◽  
Quantum Critical Point ◽  
Electron System ◽  
Spin Fluctuations ◽  
Scattering Data ◽  
Critical Fluctuations ◽  
Conventional View ◽  
Quantum Critical

The electronic properties of heavy fermion alloys are dominated by spin fluctuations which are expected to become critical when tuned by pressure to a quantum critical point (QCP), entering a magnetic ordered state. Apart from the onset of exotic superconductivity, unexpected "normal conducting" behavior is found close to the QCP, which does not seem only to escape the conventional view of metals (Fermi liquids) but also the "conventional view" of an antiferromagnetic quantum phase transition in these f-metals. So far only few compounds have been investigated by neutron scattering to directly reveal the critical fluctuations spectrum. In CeCu 59 Au 01 the fluctuations develop an unusual energy dependence, characterized by an exponent α = 0.75, which persist over the entire Brillouin zone, provoking an unexpected local non Fermi liquid behavior. The same unusual exponent derived from E/T scaling determines the H/T scaling of the uniform magnetization. Recent neutron scattering data in magnetic fields further confirm this picture of nearly free local magnetic moments (modified by α) emerging at the antiferromagnetic QCP in this strongly correlated electron system.

scholarly journals Bottlebrush polymers in the melt and polyelectrolytes in solution share common structural features

2020 ◽  
Vol 117 (10) ◽  
pp. 5168-5175 ◽  
Author(s):  
Joel M. Sarapas ◽  
Tyler B. Martin ◽  
Alexandros Chremos ◽  
Jack F. Douglas ◽  
Kathryn L. Beers
Keyword(s):  
Neutron Scattering ◽  
Correlation Length ◽  
Salt Concentration ◽  
Polymer Concentration ◽  
Structural Features ◽  
Peak Position ◽  
Correlation Peak ◽  
Grafting Density ◽  
Scattering Measurements ◽  
Polyelectrolyte Solutions

Uncharged bottlebrush polymer melts and highly charged polyelectrolytes in solution exhibit correlation peaks in scattering measurements and simulations. Given the striking superficial similarities of these scattering features, there may be a deeper structural interrelationship in these chemically different classes of materials. Correspondingly, we constructed a library of isotopically labeled bottlebrush molecules and measured the bottlebrush correlation peak position q*=2π/ξ by neutron scattering and in simulations. We find that the correlation length scales with the backbone concentration, ξ∼cBB−0.47, in striking accord with the scaling of ξ with polymer concentration cP in semidilute polyelectrolyte solutions (ξ∼cP−1/2). The bottlebrush correlation peak broadens with decreasing grafting density, similar to increasing salt concentration in polyelectrolyte solutions. ξ also scales with sidechain length to a power in the range of 0.35–0.44, suggesting that the sidechains are relatively collapsed in comparison to the bristlelike configurations often imagined for bottlebrush polymers.

scholarly journals Neutron scattering studies on spin fluctuations in Sr2RuO4

2021 ◽  
Vol 103 (10) ◽  
Author(s):  
K. Jenni ◽  
S. Kunkemöller ◽  
P. Steffens ◽  
Y. Sidis ◽  
R. Bewley ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Spin Fluctuations

Spin Fluctuations in the Heavy Fermion Superconductor UPd2Al3Studied by Neutron Inelastic Scattering

1997 ◽  
Vol 66 (7) ◽  
pp. 1884-1887 ◽  
Author(s):  
Noriaki Sato ◽  
Naofumi Aso ◽  
Gerry H. Lander ◽  
Bertrand Roessli ◽  
Takemi Komatsubara ◽  
...  
Keyword(s):  
Inelastic Scattering ◽  
Heavy Fermion ◽  
Spin Fluctuations ◽  
Neutron Inelastic Scattering ◽  
Heavy Fermion Superconductor
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