Unconventional Superconductivity and Antiferromagnetic Quantum Critical Behavior in the Isovalent-DopedBaFe2(As1−xPx)2

2010/05/31 by Y. Nakai, Yusuke Nakai, Tetsuya Iye +14 · 3 citations
Materials Science · Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Doping #Iron-based superconductors research #Phase (matter) #Phase transition #Physics #Physics of Superconductivity and Magnetism #Quantum critical point #Quantum mechanics #Quantum phase transition #Rare-earth and actinide compounds #Relaxation (psychology) #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.105.107003

published as Phys. Rev. Lett. 105, 107003 (2010) · 5 pages, 3 figures

openalex publication_date 2010/09/02 · arxiv created 2010/09/03 · arxiv updated 2015/03/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

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.

Citations

• Unconventional Superconductivity with a Sign Reversal in the Order Parameter ofLaFeAsO1−xFx
• Line nodes in the energy gap of superconductingBaFe2(As1−xPx)2single crystals as seen via penetration depth and thermal conductivity
• Evolution from Itinerant Antiferromagnet to Unconventional Superconductor with Fluorine Doping in LaFeAs(O1-xFx) Revealed by 75As and 139La Nuclear Magnetic Resonance
• Fermi-liquid instabilities at magnetic quantum phase transitions
• Superconductivity up to 30 K in the vicinity of the quantum critical point in BaFe2(As1−xPx)2

Cited by

• Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR
• Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe2(As1-xPx)2
• Vibrational anomalies in AFe2As2 (A=Ca, Sr, and Ba) single crystals