2015/03/31 by Ding Hu, Xingye Lu, Wenliang Zhang +23 · 1 citation
Business, Management and Accounting · Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Corporate Taxation and Avoidance #Crystal structure #Crystallography #Intellectual Capital and Performance Analysis #Iron-based superconductors research #Materials science #Neutron scattering #Order (exchange) #Orthorhombic crystal system #Paramagnetism #Phase (matter) #Phase transition #Physics #Quantum mechanics #Scattering #Superconductivity #Tetragonal crystal system #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.114.157002
published as Phys. Rev. Lett. 114, 157002 (2015) · 8 pages, 8 figures. including supplementary, Accepted by Physical Review Letters
arxiv created 2015/03/31 · openalex publication_date 2015/04/17 · arxiv updated 2015/06/03 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We use nuclear magnetic resonance (NMR), high-resolution x-ray, and neutron scattering studies to study structural and magnetic phase transitions in phosphorus-doped BaFe2(As_1\ensuremath-xPx)2. Previous transport, NMR, specific heat, and magnetic penetration depth measurements have provided compelling evidence for the presence of a quantum critical point (QCP) near optimal superconductivity at x=0.3. However, we show that the tetragonal-to-orthorhombic structural (Ts) and paramagnetic to antiferromagnetic (AF, TN) transitions in BaFe2(As_1\ensuremath-xPx)2 are always coupled and approach TN\ensuremath≈Ts\ensuremath≥Tc (\ensuremath≈29 K) for x=0.29 before vanishing abruptly for x\ensuremath≥0.3. These results suggest that AF order in BaFe2(As_1\ensuremath-xPx)2 disappears in a weakly first-order fashion near optimal superconductivity, much like the electron-doped iron pnictides with an avoided QCP.