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- W1658643434 abstract "We investigated the magnetism, superconductivity and their interplay in single crystals ${mathrm{Er}}_{0.8}{R}_{0.2}{mathrm{Ni}}_{2}{mathrm{B}}_{2}mathrm{C}$ $(R=mathrm{T}mathrm{b},mathrm{L}mathrm{u})$ and ${mathrm{ErNi}}_{1.9}{mathrm{Co}}_{0.1}{mathrm{B}}_{2}mathrm{C}.$ In contrast to Co substitution, R substitutions induce considerable modifications in the magnetism of Er sublattice: e.g., Tb (Lu) substitution enhances (reduces) ${T}_{mathrm{N}}$ and critical fields. Both R substitutions introduce size effects and pinning centers; the former modifies the magnon specific heat while the latter hinders the formation of a weak ferromagnetism. The superconductivity, on the other hand, is strongly (weakly) influenced by Tb and Co (Lu) substitution. Taking ${mathrm{LuNi}}_{2}{mathrm{B}}_{2}mathrm{C}$ as a nonmagnetic superconducting limit, we analyzed their superconductivities, as well as that of ${mathrm{ErNi}}_{2}{mathrm{B}}_{2}mathrm{C},$ in terms of multiple pair breaking theory on dirty superconductors. Based on this analysis, many of their superconducting features can be explained: The breakdown of de Gennes scaling is due to the presence of multiple pair breakers, the anisotropy of ${H}_{mathrm{c}2}(T)$ is related to the magnetic anisotropy, the absence of a structure in ${H}_{mathrm{c}2}(T)$ at ${T}_{mathrm{N}}$ of Lu substitution ${(T}_{mathrm{N}}<{T}_{mathrm{c}})$ is attributed to an alloying-induced destruction of phase space truncation, and the quasi parabolic temperature dependence of ${H}_{mathrm{c}2}(T)$ of Tb and Co substitutions is in part due to a saturation of antiferromagnetic correlations. For Lu substitution, the strength of magnon mediated pair breaking process(es) is substantially reduced." @default.
- W1658643434 created "2016-06-24" @default.
- W1658643434 creator A5038051471 @default.
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- W1658643434 date "2004-01-15" @default.
- W1658643434 modified "2023-09-26" @default.
- W1658643434 title "Magnetic and superconducting phase diagrams of single-crystalEr0.8R0.2Ni2B2C(R=Tb,Lu)andErNi1.9Co0.1B2C: Identification of pair-breaking mechanisms" @default.
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- W1658643434 doi "https://doi.org/10.1103/physrevb.69.024509" @default.
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