Anomalous specific heat and nuclear spin relaxation in Al-transition metal alloys

Šimánek, E.; Yoksan, S.

doi:10.1016/0375-9601(79)90044-6

Cited by 4 publications

(8 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the previously described works, we can speak of the direct dependence between the energy of relaxation and the radii of impurity atoms. Apart from this (see [6]), in the Introduction there was formulated a prob lem concerning the choice of the type of relaxation that makes the greatest contribution to the total energy of the system. Based on these prerequisites, the follow ing systematization of its types (for the Al-3d impu rity system) is suggested: (1) volume relaxation [7,8];…”

Section: Energy Of Relaxationmentioning

confidence: 99%

“…(2) ionic relaxation [6]; and (as a logical extension of the first two) (3) mixed (volume + ionic) relaxation.…”

Section: Energy Of Relaxationmentioning

confidence: 99%

“…In the case of Al 42 Fe [11] and Al 42 Mn [12], the effect of relaxation on the changes in the magnetic moments at impurity atoms was studied. Thus, it is seen that the main direc tion of the investigations was not related to the pro cesses connected with the alloy formation and the impurity concentrations exceeded the limit denoted in [6], so that it was impossible to unambiguously "sepa rate" the effects related to relaxation. As to the studies of the effect of 3d impurities on the electronic struc ture of aluminum based alloys, the most interesting work is Ref.…”

Section: Introductionmentioning

confidence: 96%

“…In turn, based on this fact, the problem of a systematic analysis of the concept of relaxation and of the development of a system of alloying of aluminum based alloys upon a theoretical consideration of the alloy formation was formulated. For example, in [6] attention is given to the effect of local "ionic" relaxation on the broaden ing of the density of states (DOS) of quasiparticles and on the independence of this phenomenon of the con centration of impurity elements related to 3d metals in the range from 2 to 0.05 at %. It is shown in [7,8] that the substitution of impurities for matrix atoms and the relaxation of the matrix leading to volume changes are closely interrelated.…”

Section: Introductionmentioning

confidence: 99%

“…These works are devoted to studying interactions of pairs of impurities of transition metals (3d and 4d) in the aluminum matrix and contain an analysis of prob lems of stability of these systems. An important feature of these investigations is their completeness and allow ance for the interaction of impurities between them selves, which is, according to [6], an important factor in studies of the alloy formation in Al based materi als (their drawback is the neglect of relaxation effects). Thus, the purpose of this work was to inves tigate the effect of relaxation on the alloy formation in the Al 1 -x M x system (M = 3d impurities; х ≈ 1.6%) with allowance for the effect of relaxation on the elec tronic structure of the alloy.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A first-principles investigation of the effect of relaxation on the alloy formation in the aluminum-3d-transition-metal system

Nikitin

2012

Phys. Metals Metallogr.

View full text Add to dashboard Cite

The aim of this investigation is to establish the effect of relaxation on the formation of ordered sub stitutional solid solutions in Al 1 -x M x alloys (M = 3d metal; x = 1.6 at %). As the main parameters of the pro cess of formation of the aluminum based solution, thermodynamic quantities such as the energy of dissolu tion and the cohesive energy have been chosen; for choosing the most appropriate substitutional element, an analysis of the relaxation energy and deviations of empirical atomic radii of the impurity from the radius of the matrix forming element has been suggested. It has been shown that there is a correlation between these thermodynamic quantities through the behavior of the density of electronic states and the Fermi energy. A regular relation has also been demonstrated to exist between the relaxation and stability of arising solid solu tions, which supports the applicability of the analysis of relaxation energy depending on the atomic radius of the matrix substituting element. The presence of anomalies in the behavior of magnetic properties of some aluminum alloys with transition metals has been shown and their explanation is given.

show abstract

Section: Energy Of Relaxationmentioning

confidence: 99%

“…(2) ionic relaxation [6]; and (as a logical extension of the first two) (3) mixed (volume + ionic) relaxation.…”

Section: Energy Of Relaxationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A first-principles investigation of the effect of relaxation on the alloy formation in the aluminum-3d-transition-metal system

Nikitin

2012

Phys. Metals Metallogr.

View full text Add to dashboard Cite

show abstract

Bibliography

Chaney¹,

Ramdas²,

Rodríguez³

et al. 1982

Thermophysical Properties Research Literature Retrieval Guide 1900–1980

View full text Add to dashboard Cite

Nuclear spin relaxation and quasiparticle excitations in superconducting aluminum-3d alloys

Parvin

MacLaughlin

1980

J Low Temp Phys

View full text Add to dashboard Cite

Aluminum-27 nuclear spin-lattice relaxation times T t have been measured in the normal and superconducting states of dilute alloys of Mn, Cr, and V in aluminum. These measurements prove the spectrum of thermally excited quasiparticle states in the superconductor and its modification by nonmagnetic resonant impurities. Theoretical studies of such systems indicate that in the Hartree-Fock (HF) approximation the BCS character of the host is basically retained in the alloy, with a reduced pairing interaction and a small additional broadening of quasiparticle states at the gap edge. Spin-fluctuation improvements on the HF approximation renormalize the parameters involved, but do not change the basic picture. Our TI data indicate gap edge broadening an order of magnitude greater than predicted. The discrepancy is nearly as large for V and Cr impurities as for Mn, which makes it unlikely that localized spin fluctuations play an important role in the broadening. Recent speculation on the effect of dislocation pinning by resonant impurities may be relevant to these results.

show abstract

Anomalous specific heat and nuclear spin relaxation in Al-transition metal alloys

Cited by 4 publications

References 8 publications

A first-principles investigation of the effect of relaxation on the alloy formation in the aluminum-3d-transition-metal system

A first-principles investigation of the effect of relaxation on the alloy formation in the aluminum-3d-transition-metal system

Bibliography

Nuclear spin relaxation and quasiparticle excitations in superconducting aluminum-3d alloys

Contact Info

Product

Resources

About