Coexistence of antiferromagnetic order and unconventional superconductivity in heavy-fermion CeRh1-xIrxIn5 compounds: Nuclear quadrupole resonance studies
Coexistence of antiferromagnetic order and unconventional superconductivity in heavy-fermion CeRh1-xIrxIn5 compounds: Nuclear quadrupole resonance studies
复制标题
DOI：
10.1103/physrevb.70.014511
复制
发表时间：
2004-07
影响因子：
3.7
通讯作者：
Guo-qing Zheng;N. Yamaguchi;Hiroki Kan;Y. Kitaoka;J. Sarrao;P. G. Pagliuso;N. O. Moreno;J. Thompson
中科院分区：
文献类型：
--
作者：
Guo-qing Zheng;N. Yamaguchi;Hiroki Kan;Y. Kitaoka;J. Sarrao;P. G. Pagliuso;N. O. Moreno;J. Thompson
We present a systematic $^{115}\mathrm{In}$ NQR study on the heavy-fermion compounds $\mathrm{Ce}{\mathrm{Rh}}_{1\ensuremath{-}x}{\mathrm{Ir}}_{x}{\mathrm{In}}_{5}$ ($x=\mathrm{0.25}$, 0.35, 0.45, 0.5, 0.55, and 0.75). The results provide strong evidence for the microscopic coexistence of antiferromagnetic (AF) order and superconductivity (SC) in the range of $0.35\ensuremath{\leqslant}x\ensuremath{\leqslant}0.55$. Specifically, for $x=0.5$, ${T}_{N}$ is observed at $3\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ with a subsequent onset of superconductivity at ${T}_{c}=0.9\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. ${T}_{c}$ reaches a maximum $(0.94\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ at $x=0.45$ where ${T}_{N}$ is found to be the highest $(4.0\phantom{\rule{0.3em}{0ex}}\mathrm{K})$. Detailed analysis of the measured spectra indicate that the same electrons participate in both SC and AF order. The nuclear spin-lattice relaxation rate $1∕{T}_{1}$ shows a broad peak at ${T}_{N}$ and follows a ${T}^{3}$ variation below ${T}_{c}$, the latter property indicating unconventional SC as in $\mathrm{Ce}\mathrm{Ir}{\mathrm{In}}_{5}$ $({T}_{c}=0.4\phantom{\rule{0.3em}{0ex}}\mathrm{K})$. We further find that, in the coexistence region, the ${T}^{3}$ dependence of $1∕{T}_{1}$ is replaced by a $T$-linear variation below $T\ensuremath{\sim}0.4\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, with the value ${({T}_{1})}_{{T}_{c}}∕{({T}_{1})}_{\mathrm{low}\phantom{\rule{0.3em}{0ex}}T}$ increasing with decreasing $x$, likely due to low-lying magnetic excitations associated with the coexisting magnetism.
We present a systematic $^{115}\mathrm{In}$ NQR study on the heavy-fermion compounds $\mathrm{Ce}{\mathrm{Rh}}_{1\ensuremath{-}x}{\mathrm{Ir}}_{x}{\mathrm{In}}_{5}$ ($x=\mathrm{0.25}$, 0.35, 0.45, 0.5, 0.55, and 0.75). The results provide strong evidence for the microscopic coexistence of antiferromagnetic (AF) order and superconductivity (SC) in the range of $0.35\ensuremath{\leqslant}x\ensuremath{\leqslant}0.55$. Specifically, for $x=0.5$, ${T}_{N}$ is observed at $3\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ with a subsequent onset of superconductivity at ${T}_{c}=0.9\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. ${T}_{c}$ reaches a maximum $(0.94\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ at $x=0.45$ where ${T}_{N}$ is found to be the highest $(4.0\phantom{\rule{0.3em}{0ex}}\mathrm{K})$. Detailed analysis of the measured spectra indicate that the same electrons participate in both SC and AF order. The nuclear spin-lattice relaxation rate $1∕{T}_{1}$ shows a broad peak at ${T}_{N}$ and follows a ${T}^{3}$ variation below ${T}_{c}$, the latter property indicating unconventional SC as in $\mathrm{Ce}\mathrm{Ir}{\mathrm{In}}_{5}$ $({T}_{c}=0.4\phantom{\rule{0.3em}{0ex}}\mathrm{K})$. We further find that, in the coexistence region, the ${T}^{3}$ dependence of $1∕{T}_{1}$ is replaced by a $T$-linear variation below $T\ensuremath{\sim}0.4\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, with the value ${({T}_{1})}_{{T}_{c}}∕{({T}_{1})}_{\mathrm{low}\phantom{\rule{0.3em}{0ex}}T}$ increasing with decreasing $x$, likely due to low-lying magnetic excitations associated with the coexisting magnetism.