Valence fluctuation and electron-phonon coupling in La68-xCexAl10Cu20Co2 (x=0, 34, and 68) metallic glasses

We study the anomalous acoustic softening behavior in La68−xCexAl10Cu20Co2 (x=0, 34, and 68) metallic glasses by magnetic susceptibility, thermal expansion, and specific heat at low temperatures. The Ce-based metallic glass exhibits valence fluctuation phenomenon, anomalous thermal expansion and acoustic Gruneisen parameter at low temperatures. And we provide experimental evidence of the existence of strong electron–phonon coupling in the Ce-based metallic glasses by specific heat. The anomalous acoustic and thermal properties are attributed to the valence instability in the metallic glasses.

[1]  J. Neumeier,et al.  Capacitive-based dilatometer cell constructed of fused quartz for measuring the thermal expansion of solids. , 2008, The Review of scientific instruments.

[2]  D. Zhao,et al.  Anomalous temperature dependent elastic moduli of Ce-based bulk metallic glass at low temperatures , 2007 .

[3]  W. Wang,et al.  Heavy-fermion behavior in cerium-based metallic glasses , 2007 .

[4]  Weihua Wang,et al.  Formation of cerium-based bulk metallic glasses , 2006 .

[5]  G. C. Rout,et al.  Electron–phonon coupling and longitudinal sound velocity in heavy fermion systems , 2005 .

[6]  Weihua Wang,et al.  Response of acoustic and elastic properties to pressure and crystallization of Ce-based bulk metallic glass , 2005 .

[7]  Weihua Wang,et al.  Bulk metallic superconductive La60Cu20Ni10Al10 glass , 2005 .

[8]  W. Wang,et al.  Tunneling states and localized mode in binary bulk metallic glass , 2005 .

[9]  W. Wang,et al.  Amorphous metallic plastic. , 2005, Physical review letters.

[10]  Weihua Wang,et al.  Soft bulk metallic glasses based on cerium , 2004 .

[11]  O. Anderson.  The Grüneisen ratio for the last 30 years , 2000 .

[12]  G. Lapertot,et al.  Anomalous lattice dynamics in intermediate-valence CeNi , 1998 .

[13]  Rivas,et al.  Electron-phonon coupling in mixed-valence systems. , 1991, Physical Review B (Condensed Matter).

[14]  Becker,et al.  Electron-phonon interaction in heavy-fermion systems. , 1990, Physical review. B, Condensed matter.

[15]  Wohlleben,et al.  Observation of phonon anomalies in the intermediate-valence compound CePd3. , 1988, Physical Review B (Condensed Matter).

[16]  Turnbull,et al.  Elastic behavior and vibrational anharmonicity of a bulk Pd40Ni40P20 metallic glass. , 1986, Physical review. B, Condensed matter.

[17]  A. Troper,et al.  Electron-phonon interaction in mixed-valence systems , 1980 .

[18]  J. Lawrence.  Scaling behavior near a valence instability: The magnetic susceptibility ofCeIn3−xSnx , 1979 .

[19]  F. R. Kroeger,et al.  Absolute linear thermal‐expansion measurements on copper and aluminum from 5 to 320 K , 1977 .

[20]  R. D. Parks,et al.  Valence fluctuation phenomena , 1981 .