Quasiparticle spectra and specific heat of a normal Fermi liquid in a spin-fluctuation model

1988 ◽  
Vol 37 (4) ◽  
pp. 1647-1665 ◽  
Author(s):  
Dermot Coffey ◽  
C. J. Pethick
Keyword(s):  
Specific Heat ◽  
Fermi Liquid ◽  
Spin Fluctuation ◽  
Normal Fermi ◽  
Fluctuation Model

Logarithmic Terms in the Specific Heat of a Normal Fermi Liquid

1968 ◽  
Vol 175 (1) ◽  
pp. 326-331 ◽  
Author(s):  
D. J. Amit ◽  
J. W. Kane ◽  
H. Wagner
Keyword(s):  
Specific Heat ◽  
Fermi Liquid ◽  
Normal Fermi

Specific Heat of a Normal Fermi Liquid. I. Landau-Theory Approach

1973 ◽  
Vol 7 (1) ◽  
pp. 304-318 ◽  
Author(s):  
C. J. Pethick ◽  
G. M. Carneiro
Keyword(s):  
Specific Heat ◽  
Fermi Liquid ◽  
Landau Theory ◽  
Theory Approach ◽  
Normal Fermi

Specific heat of a normal Fermi liquid. II. Microscopic approach

1975 ◽  
Vol 11 (3) ◽  
pp. 1106-1124 ◽  
Author(s):  
G. M. Carneiro ◽  
C. J. Pethick
Keyword(s):  
Specific Heat ◽  
Fermi Liquid ◽  
Microscopic Approach ◽  
Normal Fermi

scholarly journals Electronic Structure Correspondence of Singlet-Triplet Scale Separation in Strained Sr2RuO4

2021 ◽  
Vol 11 (2) ◽  
pp. 508
Author(s):  
Swagata Acharya ◽  
Dimitar Pashov ◽  
Elena Chachkarova ◽  
Mark van Schilfgaarde ◽  
Cédric Weber
Keyword(s):  
Magnetic Anisotropy ◽  
Fermi Liquid ◽  
Spin Fluctuation ◽  
Density Wave ◽  
Spin Density Wave ◽  
Uniaxial Strain ◽  
High Fidelity ◽  
Scale Separation ◽  
Particle Properties ◽  
Normal Fermi

At a temperature of roughly 1 K, Sr2RuO4 undergoes a transition from a normal Fermi liquid to a superconducting phase. Even while the former is relatively simple and well understood, the superconducting state has not even been understood after 25 years of study. More recently, it has been found that critical temperatures can be enhanced by the application of uniaxial strain, up to a critical strain, after which it falls off. In this work, we take an “instability” approach and seek divergences in susceptibilities. This provides an unbiased way to distinguish tendencies to competing ground states. We show that in the unstrained compound, the singlet and triplet instabilities of the normal Fermi liquid phase are closely spaced. Under uniaxial strain, electrons residing on all orbitals contributing to the Fermiology become more coherent, while the electrons of the Ru-dxy character become heavier, and the electrons of the Ru-dxz,yz characters become lighter. In the process, Im χ(q,ω) increases rapidly around q=(0.3,0.3,0)2π/a and q=(0.5,0.25,0)2π/a, while it gets suppressed at all other commensurate vectors, in particular at q=0, which is essential for spin-triplet superconductivity. We observe that the magnetic anisotropy under strain drops smoothly, which is concomitant with the increment in singlet instability. Thus, the triplet superconducting instability remains the lagging instability of the system, and the singlet instability enhances under strain, leading to a large energy-scale separation between these competing instabilities. However, since this happens even without spin-orbit coupling, we believe it is primarily the enhancement in the spin fluctuation glue around quasi-anti-ferromagnetic vectors that drives the Cooper pairing instead of the magnetic anisotropy. At large strain, an instability to a spin density wave overtakes the superconducting one. The analysis relies on a high-fidelity, ab initio description of the one-particle properties and two-particle susceptibilities, based on the quasiparticle self-consistent GWapproximation augmented by dynamical mean field theory. This approach is described and its high fidelity confirmed by comparing to observed one- and two-particle properties.

MAGNETIC PROPERTIES OF U1-xDyxAlyNi5-y (y=0,1) SYSTEMS

2003 ◽  
Vol 17 (27n28) ◽  
pp. 1453-1460
Author(s):  
ILEANA LUPSA
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Spin Fluctuation ◽  
Magnetic Moments ◽  
Transition Temperatures ◽  
Temperature Range ◽  
Fluctuation Model ◽  
Magnetically Ordered

The magnetic properties of U 1-x Dy x Al y Ni 5-y (y=0,1) systems were investigated in the 2(5)–600 K temperature range and for fields up to 80 kOe. The systems having x≥0.2 are magnetically ordered with low transition temperatures and magnetization mainly due to the Dy contribution. The nickel exhibits magnetic moments, very weak in the low temperature range and well-defined effective moments over transition temperatures. The nickel behavior is discussed in terms of the spin fluctuation model.

Spin vortices and stationary spin flows in a normal Fermi liquid

1998 ◽  
Vol 87 (4) ◽  
pp. 691-699
Author(s):  
P. L. Krotkov ◽  
V. P. Mineev
Keyword(s):  
Fermi Liquid ◽  
Normal Fermi

THE COMBINED ANALYSIS OF SPECIFIC HEAT AND THERMAL EXPANSION OF Nd1−xLuxMn2 COMPOUNDS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 810-813
Author(s):  
N.H. KIM-NGAN ◽  
P.E. BROMMER ◽  
J.J.M. FRANSE
Keyword(s):  
Magnetic Properties ◽  
Thermal Expansion ◽  
Thermodynamic Properties ◽  
Specific Heat ◽  
Crystal Field ◽  
Spin Fluctuation ◽  
Spin Reorientation ◽  
Antiferromagnetic Order ◽  
Combined Analysis ◽  
Temperature Range

Specific heat and thermal expansion measurements have been performed on Nd1−xLUxMn2 in the temperature range between 1.5K and 300K. Below 10K, anomalies are observed which are ascribed to a spin reorientation of the Nd sublattice. These anomalies are only slightly affected by the substitution of Nd by Lu. Large effects, however, are observed on the magnetic properties of the Mn sublattice. The antiferromagnetic order disappears for x exceeding 0.30. The data are analysed in terms of Grüneisen parameters. In the paramagnetic compound LuMn2, a spin-fluctuation contribution to the thermodynamic properties is observed. In the Nd-containing compounds, distinct contributions from the crystal field acting on the Nd ions can be distinguished. The variation of the magnetic properties of the Mn sublattice with the concentration of Lu is discussed.

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