75As NMR study of antiferromagnetic fluctuations in Ba(Fe1−xRux)2As2

  title={75As NMR study of antiferromagnetic fluctuations in Ba(Fe1−xRux)2As2},
  author={Tusharkanti Dey and P. Khuntia and Avinash V. Mahajan and Shilpam Sharma and Arvind Krishnasamy Bharathi},
  journal={Journal of Physics: Condensed Matter},
The evolution of 75As NMR parameters with composition and temperature was probed in the Ba(Fe1−xRux)2As2 system where Fe is replaced by isovalent Ru. While the Ru end member was found to be a conventional Fermi liquid, the composition (x = 0.5) corresponding to the highest Tc (20 K) in this system shows an upturn in the 75As below about 80 K, evidencing the presence of antiferromagnetic (AFM) fluctuations. These results are similar to those obtained in another system with isovalent substitution… 

75As NMR local probe study of magnetism in (Eu1−xKx)Fe2As2

Abstract75As NMR measurements were performed as a function of temperature and doping in Eu1−xKxFe2As2 (x = 0.5,0.7) samples. The large Eu2+ moments and their fluctuations are found to dominate the

Two types of superconducting domes in unconventional superconductors

Uncovering the origin of unconventional superconductivity is often plagued by the overwhelming material diversity with varying normal and superconducting (SC) properties. In this article, we deliver

Magnetism in the iron-based superconductors: The determination of spin-nematic fluctuations as the primary order parameter and its implications for unconventional superconductivity


Unconventional superconductivity and antiferromagnetic quantum critical behavior in the isovalent-doped BaFe2(As1-xPx)2.

The NMR study reveals that two-dimensional antiferromagnetic fluctuations are notably enhanced with little change in static susceptibility on approaching the AF phase from the superconducting dome, suggesting that the AF fluctuations associated with the quantum-critical point play a central role in the high-T(c) superconductivity.

Superconductivity in Ru-substituted polycrystalline BaFe2-xRuxAs2

The occurrence of bulk superconductivity at ~22 K is reported in polycrystalline samples of BaFe2-xRuxAs2 for nominal Ru content in the range of x=0.75 to 1.125. A systematic suppression of the spin

Physical and magnetic properties ofBa(Fe1−xRux)2As2single crystals

Single crystals of Ba(Fe1−xRux)2As2 , x < 0.37, have been grown and characterized by structural, magnetic and transport measurements. These measurements show that the structural/magnetic phase

Significant reduction of electronic correlations upon isovalent Ru substitution of BaFe2As2.

It is shown that Ru induces neither hole nor electron doping in Ba(Fe0.65Ru0.35)2As2, a compound in which superconductivity appears at the expense of magnetism, by transport measurements and angle resolved photoemission spectroscopy.

Superconductivity at 22 K in Co-doped BaFe2As2 crystals.

This is the first example of superconductivity induced by electron doping in this family of materials, and in contrast with cuprates, the BaFe2As2 system appears to tolerate considerable disorder in the FeAs planes.

Spin Susceptibility, Phase Diagram, and Quantum Criticality in the Eelctron-Doped High Tc Superconductor Ba(Fe1-xCox)2As2

We report a systematic investigation of Ba(Fe 1- x Co x ) 2 As 2 based on transport and 75 As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping progressively

Superconductivity at 43 K in an iron-based layered compound LaO1-xFxFeAs

It is reported that increasing the pressure causes a steep increase in the onset Tc of F-doped LaOFeAs, to a maximum of ∼43 K at ∼4 GPa, which is the highest Tc reported to date.

MicroscopicA75sNMR study of the effect of impurities on the first-order spin-density-wave transition inBaFe2As2

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

First-order magnetic transition in single-crystalline CaFe 2 As 2 detected by A75s nuclear magnetic resonance

We report $^{75}$As Nuclear Magnetic Resonance data in a single crystal of CaFe$_2$As$_2$. The Knight shift, electric field gradient, and spin-lattice relaxation rate are strongly temperature