Specific heats of dilute magnetic α-phase Cu-Au(Fe) alloys

William G Delinger, W. R. Savage, J. W. Schweitzer

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This study of the specific heats of dilute magnetic α-phase Cu-Au(Fe) alloys is a continuation of our work on dilute Fe in binary-host alloys. Our previous specific-heat results for the α-phase Cu-Al(Fe) system indicated that the Kondo effect depended on the particular local environment of the Fe impurity. The present study was motivated by resistivity experiments which suggested for Cu-Au(Fe) a contrasting picture where local-environment effects are not important. The specific heats of a series of α-phase Cu-Au and dilute magnetic Cu-Au(Fe) alloys with Fe concentrations near 0.04 at.% were measured over the temperature range 1-10 K. The alloys had Au concentrations of 2.4, 4.8, and 10 at.%. The excess specific heat due to the Fe impurities show a broad peak characteristic of the Kondo effect. A recently derived theoretical expression for the Kondo effect in the specific heat was successful in fitting these Cu-Au(Fe) results and the Cu(Fe) results of other investigators. The contribution from the Fe impurities for the various alloys had the same functional dependence on a scaled temperature TTK, where the TK decreased with increasing Au concentration. This agreed with the existence of a universal resistance curve for Cu-Au(Fe) found by other experimenters. Comparisons are made with our previous specific-heat result for the Cu-Al(Fe) system which could not be fit with a universal curve. It is suggested that local-environment effects are important in the Cu-Al(Fe) system in contrast with the Cu-Au(Fe) system.

Original languageEnglish (US)
Pages (from-to)1066-1070
Number of pages5
JournalPhysical Review B
Volume7
Issue number3
DOIs
StatePublished - 1973

Fingerprint

specific heat
Kondo effect
environment effects
impurities
curves
binary alloys
electrical resistivity
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Specific heats of dilute magnetic α-phase Cu-Au(Fe) alloys. / Delinger, William G; Savage, W. R.; Schweitzer, J. W.

In: Physical Review B, Vol. 7, No. 3, 1973, p. 1066-1070.

Research output: Contribution to journalArticle

Delinger, William G ; Savage, W. R. ; Schweitzer, J. W. / Specific heats of dilute magnetic α-phase Cu-Au(Fe) alloys. In: Physical Review B. 1973 ; Vol. 7, No. 3. pp. 1066-1070.
@article{e0b0fd5974654d5f8e74535a741670b2,
title = "Specific heats of dilute magnetic α-phase Cu-Au(Fe) alloys",
abstract = "This study of the specific heats of dilute magnetic α-phase Cu-Au(Fe) alloys is a continuation of our work on dilute Fe in binary-host alloys. Our previous specific-heat results for the α-phase Cu-Al(Fe) system indicated that the Kondo effect depended on the particular local environment of the Fe impurity. The present study was motivated by resistivity experiments which suggested for Cu-Au(Fe) a contrasting picture where local-environment effects are not important. The specific heats of a series of α-phase Cu-Au and dilute magnetic Cu-Au(Fe) alloys with Fe concentrations near 0.04 at.{\%} were measured over the temperature range 1-10 K. The alloys had Au concentrations of 2.4, 4.8, and 10 at.{\%}. The excess specific heat due to the Fe impurities show a broad peak characteristic of the Kondo effect. A recently derived theoretical expression for the Kondo effect in the specific heat was successful in fitting these Cu-Au(Fe) results and the Cu(Fe) results of other investigators. The contribution from the Fe impurities for the various alloys had the same functional dependence on a scaled temperature TTK, where the TK decreased with increasing Au concentration. This agreed with the existence of a universal resistance curve for Cu-Au(Fe) found by other experimenters. Comparisons are made with our previous specific-heat result for the Cu-Al(Fe) system which could not be fit with a universal curve. It is suggested that local-environment effects are important in the Cu-Al(Fe) system in contrast with the Cu-Au(Fe) system.",
author = "Delinger, {William G} and Savage, {W. R.} and Schweitzer, {J. W.}",
year = "1973",
doi = "10.1103/PhysRevB.7.1066",
language = "English (US)",
volume = "7",
pages = "1066--1070",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Institute of Physics Publising LLC",
number = "3",

}

TY - JOUR

T1 - Specific heats of dilute magnetic α-phase Cu-Au(Fe) alloys

AU - Delinger, William G

AU - Savage, W. R.

AU - Schweitzer, J. W.

PY - 1973

Y1 - 1973

N2 - This study of the specific heats of dilute magnetic α-phase Cu-Au(Fe) alloys is a continuation of our work on dilute Fe in binary-host alloys. Our previous specific-heat results for the α-phase Cu-Al(Fe) system indicated that the Kondo effect depended on the particular local environment of the Fe impurity. The present study was motivated by resistivity experiments which suggested for Cu-Au(Fe) a contrasting picture where local-environment effects are not important. The specific heats of a series of α-phase Cu-Au and dilute magnetic Cu-Au(Fe) alloys with Fe concentrations near 0.04 at.% were measured over the temperature range 1-10 K. The alloys had Au concentrations of 2.4, 4.8, and 10 at.%. The excess specific heat due to the Fe impurities show a broad peak characteristic of the Kondo effect. A recently derived theoretical expression for the Kondo effect in the specific heat was successful in fitting these Cu-Au(Fe) results and the Cu(Fe) results of other investigators. The contribution from the Fe impurities for the various alloys had the same functional dependence on a scaled temperature TTK, where the TK decreased with increasing Au concentration. This agreed with the existence of a universal resistance curve for Cu-Au(Fe) found by other experimenters. Comparisons are made with our previous specific-heat result for the Cu-Al(Fe) system which could not be fit with a universal curve. It is suggested that local-environment effects are important in the Cu-Al(Fe) system in contrast with the Cu-Au(Fe) system.

AB - This study of the specific heats of dilute magnetic α-phase Cu-Au(Fe) alloys is a continuation of our work on dilute Fe in binary-host alloys. Our previous specific-heat results for the α-phase Cu-Al(Fe) system indicated that the Kondo effect depended on the particular local environment of the Fe impurity. The present study was motivated by resistivity experiments which suggested for Cu-Au(Fe) a contrasting picture where local-environment effects are not important. The specific heats of a series of α-phase Cu-Au and dilute magnetic Cu-Au(Fe) alloys with Fe concentrations near 0.04 at.% were measured over the temperature range 1-10 K. The alloys had Au concentrations of 2.4, 4.8, and 10 at.%. The excess specific heat due to the Fe impurities show a broad peak characteristic of the Kondo effect. A recently derived theoretical expression for the Kondo effect in the specific heat was successful in fitting these Cu-Au(Fe) results and the Cu(Fe) results of other investigators. The contribution from the Fe impurities for the various alloys had the same functional dependence on a scaled temperature TTK, where the TK decreased with increasing Au concentration. This agreed with the existence of a universal resistance curve for Cu-Au(Fe) found by other experimenters. Comparisons are made with our previous specific-heat result for the Cu-Al(Fe) system which could not be fit with a universal curve. It is suggested that local-environment effects are important in the Cu-Al(Fe) system in contrast with the Cu-Au(Fe) system.

UR - http://www.scopus.com/inward/record.url?scp=35949038713&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=35949038713&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.7.1066

DO - 10.1103/PhysRevB.7.1066

M3 - Article

VL - 7

SP - 1066

EP - 1070

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 3

ER -