Doping-Enhanced Antiferromagnetism in Ca1-xLaxFeAs2

Abstract

In iron pnictides, high temperature superconductivity emerges after suppressing antiferromagnetism by doping. Here we show that antiferromagnetism in Ca${}_{1-x}$La${}_x$FeAs${}_2$ is robust against and even enhanced by doping. Using ${}^{75}$As-nuclear magnetic resonance and nuclear quadrupole resonance techniques, we find that an antiferromagnetic order occurs below the Néel temperature $T_{\mathrm{N}}$ = 62 K at a high doping concentration ($x$ = 0.15) where superconductivity sets in at the transition temperature $T_{\mathrm{c}}$ = 35 K. Unexpectedly, $T_{\mathrm{N}}$ is enhanced with increasing doping, rising up to $T_{\mathrm{N}}$ = 70 K at $x$ = 0.24. The obtained phase diagram of this new system enriches the physics of iron-based high-$T_{\mathrm{c}}$ superconductors.

5 pages, 5 figures, to appear in Phys. Rev. B

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Cited by in corpus (21)

• Neutron spin resonance in the 112-type iron-based superconductor
• Discovery of a novel 112-type iron-pnictide and La-doping induced superconductivity in Eu1-xLaxFeAs2 (x = 0 ~ 0.15)
• Crystal growth and phase diagram of 112-type iron pnictide superconductor Ca1-yLayFe1-xNixAs2
• Coexistence of superconductivity and antiferromagnetism in Ca${}_{0.74(1)}$La${}_{0.26(1)}$(Fe${}_{1-x}$Co${}_x$)As${}_2$ single crystals
• Superconductivity and Dirac Fermions in 112-phase Pnictides
• Charge fluctuations and nodeless superconductivity in quasi-one-dimensional Ta${}_4$Pd${}_3$Te${}_{16}$ revealed by ${}^{125}$Te-NMR and ${}^{181}$Ta-NQR
• Phase stability and large in-plane resistivity in the 112-type iron-based superconductor Ca${}_{1-x}$La${}_x$FeAs${}_2$
• Induced spin-triplet pairing in the coexistence state of antiferromagnetism and singlet superconductivity: collective modes and microscopic properties
• Quasi-2D behavior of 112-type iron-based superconductors
• Co-doping effects on magnetism and superconductivity in the 112-type EuFeAs2 system
• Spatial competition of the ground states in 1111 iron pnictides
• Coexistence of ferromagnetism, antiferromagnetism, and superconductivity in magnetically anisotropic (Eu,La)FeAs2
• Correlation between non-Fermi-liquid behavior and superconductivity in (Ca, La)(Fe,Co)As2 iron arsenides: A high-pressure study
• Nonlinear and time-resolved optical study of the 112-type iron-based superconductor parent Ca${}_{1-x}$La${}_x$FeAs${}_2$ across its structural phase transition
• Structural Phase Transition, Antiferromagnetism and Two Superconducting Domes in LaFeAsO${}_{1-x}$F${}_x$ (0 $<x\le$ 0.75)
• Optical study of the antiferromagnetic ordered state in electron-overdoped Ca0.77Nd0.23FeAs2
• Pressure-induced magnetism in iron-based superconductors $A$Fe${}_2$As${}_2$ ($A=$ K, Cs, Rb)
• Suppression of nematicity by tensile strain in multilayer FeSe/SrTiO${}_3$ films
• Persistent antiferromagnetic order in heavily overdoped Ca${}_{1-x}$La${}_x$FeAs${}_2$
• Pressure-Induced Superconductivity from Doping-Induced Antiferromagnetic Phase of 112-type Ca${}_{1-x}$La${}_x$FeAs${}_2$
• Discovery of a bi-critical point between antiferromagnetic and superconducting phases in pressurized single crystal Ca0.73La0.27FeAs2