Specific heat of the iron-based high-$T c$ superconductor SmO$ {1-x}$F$ x$FeAs - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: The specific heat $CT$ of new iron-based high-$T c$ superconductorSmO$ {1-x}$F$ x$FeAs $0 \leq x \leq 0.2$ was systematically studied. Forundoped $x$ = 0 sample, a specific heat jump was observed at 130 K. This isattributed to the structural or spin-density-wave SDW transition, which alsomanifests on resistivity as a rapid drop. However, this jump disappears withslight F doping in $x$ = 0.05 sample, although the resistivity drop stillexists. The specific heat $C-T$ shows clear anomaly near $T c$ for $x$ = 0.15and 0.20 superconducting samples. Such anomaly has been absent inLaO$ {1-x}$F$ x$FeAs. For the parent compound SmOFeAs, $CT$ shows a sharppeak at 4.6 K, and with electron doping in $x$ = 0.15 sample, this peak shiftsto 3.7 K. It is interpreted that such a sharp peak results from theantiferromagnetic ordering of Sm$^{3+}$ ions in this system, which mimics theelectron-doped high-$T c$ cuprate Sm$ {2-x}$Ce$ x$CuO$ {4-\delta}$.



Autor: L. Ding, C. He, J. K. Dong, T. Wu, R. H. Liu, X. H. Chen, S. Y. Li

Fuente: https://arxiv.org/







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