Tetsuya Iye

Unconventional Superconductivity and Antiferromagnetic Quantum Critical Behavior in the Isovalent-Doped BaFe_{2}(As_{1-x}P_{x})_{2}

Spin dynamics evolution of BaFe2(As(1-x)Px){2} was probed as a function of P concentration via 31P NMR. Our NMR study reveals that two-dimensional antiferromagnetic (AF) fluctuations are notably enhanced with little change in static susceptibility on approaching the AF phase from the superconducting dome. Moreover, the magnetically ordered temperature θ deduced from the relaxation rate vanishes at optimal doping. These results provide clear-cut evidence for a quantum-critical point, suggesting that the AF fluctuations associated with the quantum-critical point play a central role in the high-T(c) superconductivity.

Stripe antiferromagnetic correlations in LaFeAsO1-x Fx probed by A 75 s NMR

^{31}\text{P}

Emergence of Orbital Nematicity in the Tetragonal Phase of BaFe2(As1−xPx)2

and

Normal-state spin dynamics in the iron-pnictide superconductors BaFe 2 (As 1 − x P x ) 2 and Ba(Fe 1 − x Co x ) 2 As 2 probed with NMR measurements

^{75}\text{A}\text{s}

Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe2(As1-xPx)2

NMR measurements were performed in superconducting

Nonmagnetic pair-breaking effect in La(Fe1−xZnx)AsO0.85studied byAs75andLa139NMR and NQR

{\text{BaFe}}_{2}{({\text{As}}_{0.67}{\text{P}}_{0.33})}_{2}

Enhanced anisotropic spin fluctuations below tetragonal-to-orthorhombic transition in LaFeAs(O 1-xF x) probed by 75As and 139La NMR

with

P-concentration dependence of the quasiparticle density of states in BaFe2(As1-xPx)2

{T}_{c}=30\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Diamagnetism above T c in Underdoped Bi 2,2 Sr 1.8 Ca 2 Cu 3 O 10+δ

. The nuclear-spin-lattice relaxation rate