ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The specific heat cp(T) and the magnetization M(B,T) of the layered superconductors Y2C2I2, Y2〈sup ARRANGE="STAGGER"〉13C2I2 (Tc(approximate)10 K), Y2C2Br2 (Tc(approximate)5 K), and of Y2C2Br0.5I1.5 (Tc(approximate)11.6 K) were measured from 2–80 K in magnetic fields up to 10 T. All samples exhibit sharp phase transitions in zero field. The jump Δcp at Tc is drastically reduced in amplitude and broadens significantly with increasing field. The temperature dependence of Δcp(T) and of Bc(T) is analyzed and is consistent with strong electron–phonon coupling. The 13C/12C isotope effect of Y2C2X2 is found to be nearly zero. In contrast to this finding the 3-dimensional parent compound YC2 shows weak-coupling BCS behavior. The anisotropic thermodynamic parameters of the materials are evaluated and discussed. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.367555
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