期刊
PHYSICAL REVIEW B
卷 92, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.180508
关键词
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资金
- MEXT [22103004, 25400372, 25400374, 26287082, 15H01047, 15H05852]
- Grants-in-Aid for Scientific Research [15H05852, 15H01047, 26287082] Funding Source: KAKEN
In iron pnictides, high temperature superconductivity emerges after suppressing antiferromagnetism by doping. Here, we show that antiferromagnetism in Ca1-xLaxFeAs2 is robust against and even enhanced by doping. Using As-75-nuclear magnetic resonance and nuclear quadrupole resonance techniques, we find that an antiferromagnetic order occurs below the Neel temperature T-N = 62 K at a high doping concentration (x = 0.15) where superconductivity sets in at the transition temperature T-c = 35 K. In the superconducting state coexisting with antiferromagnetism, the nuclear-spin-lattice relaxation rate 1/T-1 becomes proportional to T, indicating gapless excitations. Unexpectedly, TN is enhanced with increasing doping, rising up to T-N = 70 K at x = 0.24. The obtained phase diagram of this system enriches the physics of iron-based high-T-c superconductors.
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