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      Structural and magnetic phase transitions near optimal superconductivity in BaFe\(_2\)(As\(_{1-x}\)P\(_x\))\(_2\)

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          Abstract

          We use nuclear magnetic resonance (NMR), high-resolution x-ray and neutron scattering to study structural and magnetic phase transitions in phosphorus-doped BaFe\(_2\)(As\(_{1-x}\)P\(_x\))\(_2\). 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 (\(T_s\)) and paramagnetic to antiferromagnetic (AF, \(T_N\)) transitions in BaFe\(_2\)(As\(_{1-x}\)P\(_x\))\(_2\) are always coupled and approach to \(T_N\approx T_s \ge T_c\) (\(\approx 29\) K) for \(x=0.29\) before vanishing abruptly for \(x\ge 0.3\). These results suggest that AF order in BaFe\(_2\)(As\(_{1-x}\)P\(_x\))\(_2\) disappears in a weakly first order fashion near optimal superconductivity, much like the electron-doped iron pnictides with an avoided QCP.

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          Magnetism and its microscopic origin in iron-based high-temperature superconductors

          High-temperature superconductivity in the iron-based materials emerges from, or sometimes coexists with, their metallic or insulating parent compound states. This is surprising since these undoped states display dramatically different antiferromagnetic (AF) spin arrangements and N\(\rm \acute{e}\)el temperatures. Although there is general consensus that magnetic interactions are important for superconductivity, much is still unknown concerning the microscopic origin of the magnetic states. In this review, progress in this area is summarized, focusing on recent experimental and theoretical results and discussing their microscopic implications. It is concluded that the parent compounds are in a state that is more complex than implied by a simple Fermi surface nesting scenario, and a dual description including both itinerant and localized degrees of freedom is needed to properly describe these fascinating materials.
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            Author and article information

            Journal
            2015-03-31
            Article
            10.1103/PhysRevLett.114.157002
            1503.08947
            aee8b7fb-3210-4647-bbf1-8301cb9de705

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

            History
            Custom metadata
            Phys. Rev. Lett. 114, 157002 (2015)
            8 pages, 8 figures. including supplementary, Accepted by Physical Review Letters
            cond-mat.supr-con cond-mat.str-el

            Condensed matter
            Condensed matter

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