Electron-phonon interaction in Gd 1-xCa xBaSrCu 3O 7-δ superconductors
Polycrystalline Gd1−xCaxBaSrCu3O7−ı samples (0 ≤ x ≤ 0.1) were prepared via solid-state reaction. The superconducting critical temperature Tc and lattice parameter decrease with doping content. Temperature dependence of the specific heat of all samples was measured with the thermal relaxation...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2012
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| Subjects: | |
| Online Access: | http://eprints.intimal.edu.my/183/ http://eprints.intimal.edu.my/183/1/12.pdf |
| Summary: | Polycrystalline Gd1−xCaxBaSrCu3O7−ı samples (0
≤
x
≤
0.1) were prepared via solid-state reaction. The
superconducting critical temperature Tc and lattice parameter decrease with doping content. Temperature
dependence of the specific heat of all samples was measured with the thermal relaxation technique
using a Physical Property Measurement System from about 2 K to 150 K. The calculated Debye temperature
D at 10 K is found to be inversely proportional to Tc. Subsequently, the electron–phonon
coupling constant was estimated based on standard BCS theory (BCS) in the weak coupling limit and twodimensional
Van Hove scenario (VH). The calculated values of VH in this study (around 0.04) are close to
the experimental data as reported by other researchers on Bi-based and YBCO samples. Hence, the twodimensional
Van Hove scenario seems to be a viable candidate for the mechanism of superconductivity
if electron–phonon coupling plays a role in superconductivity of these materials. |
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