Low-temperature properties of a two-level system interacting with conduction electrons: An application of the overcompensated multichannel Kondo model

1991 ◽  
Vol 43 (16) ◽  
pp. 13294-13304 ◽  
Author(s):  
P. D. Sacramento ◽  
P. Schlottmann
Keyword(s):  
Low Temperature ◽  
Level System ◽  
Kondo Model ◽  
Conduction Electrons

Low-temperature physics of the two-impurity, two-channel Kondo model

1994 ◽  
Vol 199-200 ◽  
pp. 402-405 ◽  
Author(s):  
Kevin Ingersent ◽  
Barbara A. Jones
Keyword(s):  
Low Temperature ◽  
Kondo Model ◽  
Low Temperature Physics

Applications of ESR to Carbonaceous Materials

1982 ◽  
Vol 36 (1) ◽  
pp. 52-57 ◽  
Author(s):  
L. S. Singer ◽  
I. C. Lewis
Keyword(s):  
Free Radicals ◽  
Electron Spin Resonance ◽  
Low Temperature ◽  
Electron Spin ◽  
Paramagnetic Species ◽  
Carbonaceous Materials ◽  
Conduction Electrons ◽  
Spin Resonance ◽  
Higher Temperature ◽  
Low Temperature Pyrolysis

The applications of electron spin resonance (ESR) to carbonaceous materials are reviewed. The stable paramagnetic species observed in the products of low-temperature pyrolysis are odd-alternate neutral free radicals, whereas the unpaired spins of higher temperature carbons and graphites are primarily conduction electrons. The variety of ESR properties and phenomena requires special attention to techniques of measurement and interpretations of results. The relevance to the carbonization process of the free radicals observed by ESR is also discussed.

The theory of the ferromagnetism of conduction electrons at low temperatures

1965 ◽  
Vol 284 (1398) ◽  
pp. 423-441 ◽  
Keyword(s):  
Low Temperature ◽  
Spin Wave ◽  
Single Particle ◽  
Lattice Site ◽  
Spontaneous Magnetization ◽  
Spin Waves ◽  
Green Functions ◽  
Linear Combinations ◽  
Conduction Electrons ◽  
Occupation Numbers

A theory is presented in which the effect of spin waves on the single-particle states of conduction electrons is obtained as well as the effect of the conduction electrons on the spin waves. Green function techniques are employed. The Hamiltonian is taken to contain the single-particle energies of the conduction electrons in the absence of interactions, the Coulomb interaction between electrons in Wannier states centred on the same lattice site C , and the interatomic exchange terms J ij . Interband integrals are neglected. The chain of equations for the single-particle Green functions is decoupled in such a way as to include the effects of the spin waves in the single-particle Green functions. The theory is worked out on the assumption that C is very much greater than the band width and the J ij so that at T ═ 0 the double occupation of Wannier orbital states is the minimum possible. The resulting single-particle occupation numbers are linear combinations of Fermi-Dirac functions. The low temperature spontaneous magnetization ξ is found to be a product of a spin-wave magnetization and a single-particle magnetization ξ s.p ., and so contains terms varying as T 1 and T 1 , and T 2 if both spin sub-bands are partially occupied in the ground state. The low temperature specific heat contains T and T 1 terms. The results of the Heisenberg model are obtained in the appropriate limit. Expressions for the spin-wave energy and its temperature dependence are discussed.

Peculiar low-temperature properties of metallicNd2−xCexCuO4caused by interactions between Nd moments and conduction electrons

1997 ◽  
Vol 56 (20) ◽  
pp. 12961-12969 ◽  
Author(s):  
E. Maiser ◽  
W. Mexner ◽  
R. Schäfer ◽  
T. Schreiner ◽  
P. Adelmann ◽  
...  
Keyword(s):  
Low Temperature ◽  
Conduction Electrons

scholarly journals The Electrical and Thermal Conductivities of Monovalent Metals

1954 ◽  
Vol 7 (1) ◽  
pp. 70 ◽  
Author(s):  
PG Klemens
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Fermi Surface ◽  
Reasonable Agreement ◽  
Spherical Shape ◽  
Lattice Vibrations ◽  
Electron Theory ◽  
Transverse Lattice ◽  
Conduction Electrons ◽  
Thermal Conductivities

The experimentally determined values of the high and low temperature electrical and thermal conductivities of pure sodium, copper, silver, and gold are such that the ratios of these quantities for each of these metals do not agree with the values expected from the Bloch free electron theory, except for the high temperature Wiedemann-Franz ratio. Reasonable agreement can be achieved by assuming (i) that the conduction electrons can interact directly with transverse lattice vibrations, and (ii) that the Fermi surface departs significantly from spherical shape in all these metals, and touches the boundary of the Brillouin zone in the case of copper, silver, and gold.

scholarly journals The Use of Fresh Cogongrass as Transportation Media with Level Dry System for Broodstock of Crayfish on Various Old Time

2015 ◽  
Vol 17 (3) ◽  
pp. 197
Author(s):  
Ferdinand Hukama Taqwa ◽  
Yulisman - ◽  
I. S. Yulian
Keyword(s):  
Survival Rate ◽  
Low Temperature ◽  
Experimental Animal ◽  
Pond Water ◽  
Filler Material ◽  
Design Experiment ◽  
Level System ◽  
Major Research

The research was to determine the effect of the use of fresh cogongrass as media packaging filler on survival rate of broodstock of crayfish that transported with level dry system for 24, 48, dan 72 hours which randomized completely design experiment. The research preparation were media preparation of pond water, preparation of filler material and preparation of experimental animal (3 days adaptation after arrived from producer and starvation for 24 hours). The major research were anestetion of broodstock of crayfish with direct sock of low temperature at 12oC for ±5 minutes, transportation experiment of broodstock with fresh cogongrass as material filler. The result showed that the use of fresh cogongrass on various old time of dry level system has a significantly different to time of recovery and survival rate of broodstock of crayfish after tranforted. The fastest time of recovery was 89.55 seconds for 24 hours transportation and significantly different with time of transportation for 48 hours and 72 hours. The survival rate after tranported the highest was 98.89% for 24 hours transportation and significantly different with time of transportation for 48 hours and 72 hours. This research showed that the use of fresh cogongrass as material packaging filler of dry level system was still effective until 48 hours.<br />Keywords: afresh cogongrass, broodstock of crayfish, various old time transportation, level dry system

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