Microscopic study of the effect of impurities on the first order spin density wave transition in BaFe${}_2$As${}_2$

Abstract

We report an ${}^{75}$As NMR study of BaFe${}_2$As${}_2$ in both single crystals and polycrystal forms. We find that Sn impurities in the single crystal dramatically alter the low energy spin fluctuations and suppress the ordering temperature from 138 K to 85 K. In contrast to Sn-free samples, we find that the temperature dependence of the ${}^{75}$As NMR spectra and spin lattice relaxation rates reveal a second order phase transition to a state of incommensurate magnetic order.

4 pages, 4 figures ; extensive and significant changes have been made to the previous version, focusing on the effect of impurities on the intrinsic physics

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Cited by in corpus (21)

• Superconductivity in Iron Compounds
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
• Magnetic Exchange Interactions in BaMn2As2: A Case Study of the J1-J2-Jc Heisenberg Model
• Neutron diffraction on antiferromagnetic ordering in single-crystal BaFe2As2
• The nature of the magnetic and structural phase transitions in BaFe${}_2$As${}_2$
• Homogeneous vs. inhomogeneous coexistence of magnetic order and superconductivity probed by NMR in Co and K doped iron pnictides
• Anisotropic magnetic and superconducting properties of pure and Co-doped CaFe${}_2$As${}_2$ single crystals
• Anisotropic spin fluctuations and multiple superconducting gaps in hole-doped Ba_0.7K_0.3Fe_2As_2: NMR in a single crystal
• Chemical Pressure and Physical Pressure in BaFe_2(As_{1-x}P_{x})_2
• First order magnetic transition in single crystal CaFe${}_2$As${}_2$ detected by ${}^{75}$As NMR
• Local Magnetic Inhomogeneities in Lightly Doped BaFe${}_2$As${}_2$
• Distinct high-T transitions in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Large Miscibility Gap in the Ba(Mn_xFe_{1-x})2As2 System
• Systematic ^{75}As NMR study of the dependence of low-lying excitations on F doping in the iron oxypnictide LaFeAs(O_{1-x}F_{x})
• Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2
• Pseudogap-like phase in Ca(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ revealed by ${}^{75}$As NQR
• Anisotropic thermal expansion of AEFe2As2 (AE = Ba, Sr, Ca) single crystals
• Magnetic Impurities in the Pnictide Superconductor Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Local electromagnetic properties of magnetic pnictides: A comparative study probed by NMR measurement
• 75As NMR probe of antiferromagnetic fluctuations in Ba(Fe1-xRux)2As2