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| Home > Publications database > Structural and Magnetic Phase Transitions near Optimal Superconductivity in BaFe$_2$(As$_{1−x}$P$_x$)2 |
| Journal Article | IMPULSE-2015-00234 |
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2015
APS
College Park, Md.
Please use a persistent id in citations: doi:10.1103/PhysRevLett.114.157002
Abstract: 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(As1−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(As1−xPx)2 are always coupled and approach TN≈Ts≥Tc (≈29 K) for x=0.29 before vanishing abruptly for x≥0.3. These results suggest that AF order in BaFe2(As1−xPx)2 disappears in a weakly first-order fashion near optimal superconductivity, much like the electron-doped iron pnictides with an avoided QCP.
Keyword(s): Magnetic Materials (1st) ; Key Technologies (1st) ; Information Technology and Functional Materials (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd)
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