{sup 75}As NMR and XRD Study of Structural and Electronic Inhomogeneities in Ba(Fe{sub 1−x}Ni{sub x}){sub 2}As{sub 2}

• Published in: Journal of superconductivity and novel magnetism Vol. 31; no. 10
• Main Authors: Nikolaev, E. G., Lugansky, L. B., Vlasenko, V. A., Pervakov, K. S., Martovitsky, V. P., Eltsev, Yu. F., Bud’ko, S. L., Canfield, P. C.
• Format: Journal Article
• Language: English
• Published: United States 15-10-2018
• Subjects: ANTIFERROMAGNETISM; ARSENIC 75; ARSENIDES; BARIUM COMPLEXES; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; IMPURITIES; IRON; MONOCRYSTALS; NICKEL; NUCLEAR MAGNETIC RESONANCE; PHASE DIAGRAMS; SPIN-LATTICE RELAXATION; TEMPERATURE RANGE 0065-0273 K; X-RAY DIFFRACTION
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/S10948-018-4587-X

We have used {sup 75}As NMR and x-ray diffraction analysis to study the structural and electronic inhomogeneities in Ba(Fe{sub 1−x}Ni{sub x}){sub 2}As{sub 2} crystals with x near the border of the antiferromagnetic domain. Unequal nickel population of the equivalent Fe planes and rather homogeneous distribution of Ni inside the planes have been found in the well-ordered single crystal with x = 0.036. Below 40 K a signal wipeout of {sup 75}As NMR spectra is observed for the crystals with x = 0.036 and 0.037. This fact together with spin-lattice relaxation peculiarities is treated a result of the system glassy behavior in this region of the phase diagram. The {sup 75}As NMR data also indicate on partial suppression of antiferromagnetic spin fluctuations around the Ni impurity in these crystals at low temperatures.