| Original Articles |
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Magnetic Pair-Breaking in Y1-xHoxNi2B2C ( x=0, 0.25, 0.5, 0.75) Single Crystals |
| ZHAO Song-Rui1;SHEN Jing-Qin1;XU Zhu-An1;Takeya H2;Hirata K2 |
| 1Department of Physics, Zhejiang University, Hangzhou 310027
2National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan |
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| Cite this article: |
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ZHAO Song-Rui, SHEN Jing-Qin, XU Zhu-An et al 2006 Chin. Phys. Lett. 23 975-977 |
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Abstract Temperature-dependent resistivity and magnetic susceptibility were studied for quaternary borocarbide intermetallic compounds Y1-xHoxNi2B2C (x=0, 0.25, 0.5, 0.75), which show coexistence of superconductivity with magnetism. In a normal state, the compounds exhibit conventional metallic behaviour. The Debye temperature θD is derived by fitting the temperature dependence of resistivity to the Bloch--Gruneisen expression, i.e. θD scales with M-0.5 (M is the averaged atomic mass on the Y3+ site), which means that the acoustic mode of the lattice vibrating spectrum is influenced by the Y3+ site atoms. Fitting the temperature-dependent magnetic susceptibility above TN to the Curie--Weiss law, effective magnetic moment μeff is deduced, and then de Gennes factor dG is calculated. It is found that as Ho content increases, μeff as well as dG increases and TC decreases. Moreover, the decrease of TC scales with dG, i.e., Δ TC ∝ -nI2 N(εF)dG, which is consistent with the prediction of the Abrikosov--Gor'kov theory. We suggest that the depression of TC could be mainly ascribed to the magnetic pair-breaking effect of magnetic Ho3+ ions. The change of Debye temperature with Ho content may not have significant impact on TC.
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| Keywords:
74.70.Dd
74.25.Fy
74.25.Ha
74.62.-c
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Published: 01 April 2006
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| PACS: |
74.70.Dd
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(Ternary, quaternary, and multinary compounds)
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74.25.Fy
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74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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74.62.-c
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(Transition temperature variations, phase diagrams)
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