1999/11/19 by Sherryl Manalo, S. Manalo, Manalo, S. +8
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Boron and Carbon Nanomaterials Research #FOS: Physical sciences #High-pressure geophysics and materials #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/9911305
12 pages, 17 figures, to be published in Physical Review B (scheduled for March, 2001)
openalex publication_date 1999/11/19 · arxiv created 2001/01/27 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Specific heat and resistivity measurements were performed on polycrystalline samples of the solid-solution YxLu_(1-x)Ni2B2C in order to determine thermodynamic properties such as the specific-heat difference, the thermodynamic critical field Hc(T), as well as the upper critical field Hc2(T). These properties were analyzed within the Eliashberg theory including anisotropy effects, yielding electron-phonon coupling anisotropy parameters ranging beween 0.02 and 0.03 for the whole series, and Fermi velocity anisotropy parameters of = 0.245-0.3. Excellent agreement between theory and experiment was achieved for these parameters, the Sommerfeld constant and model phonon spectra determined from specific heat measurements. An analysis of the previously investigated boronitride La3Ni2B2N3 for comparison revealed the electron-phonon anisotropy to be of great significance in describing its thermodynamic properties and the calculations yielded \~ 0.08 and ~ 0.245. The Tc-behavior within the series YxLu_(1-x)Ni2B2C is discussed in terms of coupling and impurity effects, and the density of states at the Fermi level N(0).