Temperature versus Sm concentration phase diagram and quantum criticality in the correlated electron system Ce1−xSmxCoIn5
Temperature versus Sm concentration phase diagram and quantum criticality in the correlated electron system Ce1−xSmxCoIn5
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相关电子系统 Ce1–xSmxCoIn5 中温度与 Sm 浓度的相图和量子临界性
DOI：
10.1103/physrevb.97.235149
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发表时间：
2018
影响因子：
3.7
通讯作者：
Maple, M. B.
中科院分区：
文献类型：
--
作者：
Pouse, N.;Jang, S.;White, B. D.;Ran, S.;Adhikari, R. B.;Almasan, C. C.;Maple, M. B.
我们报道了相关电子系统的电阻率、磁化强度和比热测量()。重费米子化合物的超导电性(SC)随Sm浓度的增加而受到抑制，反铁磁(AFM)有序随Sm浓度的增加而受到抑制，在量子临界点附近收敛，没有迹象表明在QCP附近SC和AFM共存。在QCP附近的正常态电阻率和比热中观察到非费米液体(NFL)行为，例如，其幂函数关系的系数和指数分别在At和At表现出明显的极大值和极小值，而在At则表现出对数发散。在这一范围内出现了低温反转，这让人想起单一杂质近藤效应，这表明Sm替代调节了竞争的近藤和Ruderman-Kittel-Kasuya-Yosida能量尺度的相对强度。Sc随Sm离子磁矩的增加而受到抑制，可能与超导中的Ce准粒子与Sm离子的磁矩交换作用有关。
We report electrical resistivity, magnetization, and specific heat measurements on the correlated electron system(). Superconductivity (SC) in the heavy-fermion compound, which is suppressed with increasing Sm concentration, and antiferromagnetic (AFM) order of, which is suppressed with decreasing, converge near a quantum critical point at, with no indication of coexistence of SC and AFM in the vicinity of the QCP. Non-Fermi-liquid (NFL) behavior is observed in the normal-state electrical resistivity,, and specific heat,, in the vicinity of the QCP; e.g., the coefficient and the exponent of the power-lawdependence ofexhibit pronounced maxima and minima, respectively, at, whileexhibits a logarithmic divergence inat. A low-temperature upturn indevelops in the rangewhich is reminiscent of a single impurity Kondo effect, suggesting that Sm substitution tunes the relative strength of competing Kondo and Ruderman-Kittel-Kasuya-Yosida energy scales. The suppression of SC with increasingis probably associated with the exchange interaction between the Ce quasiparticles involved in the superconductivity and the magnetic moments of the Sm ions.