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Hassinger, Elena; Gredat, G.; Valade, F.; Cotret, S. René de; Juneau-Fecteau, A.; Reid, J.-Ph.; Kim, H.; Tanatar, M. A.; Prozorov, Ruslan; Shen, Bing; Wen, H. H.; Doiron-Leyraud, N.; Taillefer, Louis

doi:10.1103/physrevb.86.140502

Cited by 57 publications

(47 citation statements)

References 19 publications

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“…Within a narrow composition range, we observe a C 4 -symmetric magnetic phase, which apparently has been missed in previous investigations12141516. In strong contrast to Na-doped BaFe 2 As 2 , the C 4 -phase is, however, not stable to zero temperature and reverts back to the C 2 phase in the vicinity of the onset of superconductivity.…”

contrasting

confidence: 68%

“…Up to now, a similar C 4 -magnetic phase has not been observed in the closely related Ba 1− x K x Fe 2 As 2 system, which was the first iron-based superconductor of 122-type stoichiometry to be discovered11 and has the highest T c =38 K within this family. However, an unidentified phase transition in resistivity measurements under pressure12 hints that an additional instability is close by. Earlier theoretical work indicates the close proximity in energy between C 4 - and C 2 -symmetric magnetic structures13.…”

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confidence: 99%

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Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2

et al. 2015

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Detailed knowledge of the phase diagram and the nature of the competing magnetic and superconducting phases is imperative for a deeper understanding of the physics of iron-based superconductivity. Magnetism in the iron-based superconductors is usually a stripe-type spin-density-wave, which breaks the tetragonal symmetry of the lattice, and is known to compete strongly with superconductivity. Recently, it was found that in some systems an additional spin-density-wave transition occurs, which restores this tetragonal symmetry, however, its interaction with superconductivity remains unclear. Here, using thermodynamic measurements on Ba1−xKxFe2As2 single crystals, we show that the spin-density-wave phase of tetragonal symmetry competes much stronger with superconductivity than the stripe-type spin-density-wave phase, which results in a novel re-entrance of the latter at or slightly below the superconducting transition.

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confidence: 68%

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confidence: 99%

Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2

et al. 2015

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“…Contrary to the cuprates-in which magnetic order is of Neel type [5]-the parent compounds of iron-based compounds LnOFeAs (Ln = rare earth metals) and AeFe 2 As 2 (Ae = alkaline earth metals) show a magnetic transition into stripy antiferromagnetic phase [1], preceded or concomitant with a phase transition from high-temperature tetragonal (HTT, referred to C 4 phase) to low-temperature orthorhombic (LTO, referred to C 2 phase) structure. Even more complicated phase diagrams are reported for hole-doped (Ba 1 − x K x )Fe 2 As 2 , both under pressure [6,7] and at ambient pressure [8]. Similar anomaly in a much broader composition range is observed in (Ba 1 − x Na x )Fe 2 As 2 [9,10] and (Sr 1 − x Na x )Fe 2 As 2 [11].…”

Section: Introductionsupporting

confidence: 54%

Polarized Light Microscopy Study on the Reentrant Phase Transition in a (Ba1 – xKx)Fe2As2 Single Crystal with x = 0.24

et al. 2016

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A sequence of structural/magnetic transitions on cooling is reported in the literature for hole-doped iron-based superconductor (Ba 1 − x K x )Fe 2 As 2 with x = 0.24. By using polarized light microscopy, we directly observe the formation of orthorhombic domains in (Ba 1 − x K x )Fe 2 As 2 (x = 0.24) single crystal below a temperature of simultaneous structural/magnetic transition T N~8 0 K. The structural domains vanish below~30 K, but reappear below T = 15 K. Our results are consistent with reentrance transformation sequence from high-temperature tetragonal (HTT) to low temperature orthorhombic (LTO1) structure at T N~8 0 K, LTO1 to low temperature tetragonal (LTT) structure at T c 25 K, and LTT to low temperature orthorhombic (LTO2) structure at T~15 K.

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“…A magnetically driven C 4 phase also provides a natural explanation for the new phase observed in transport measurements in Ba 1 À x K x Fe 2 As 2 under external pressure 30 and may explain anomalous diffraction results in Ba(Fe 1 À x Mn x ) 2 As 2 (ref. 31), so it is probably present in other iron-based superconductors, although our calculations show that its stability is highly sensitive to details of the electronic structure.…”

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confidence: 82%

Magnetically driven suppression of nematic order in an iron-based superconductor

et al. 2014

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A theory of superconductivity in the iron-based materials requires an understanding of the phase diagram of the normal state. In these compounds, superconductivity emerges when stripe spin density wave (SDW) order is suppressed by doping, pressure or atomic disorder. This magnetic order is often pre-empted by nematic order, whose origin is yet to be resolved. One scenario is that nematic order is driven by orbital ordering of the iron 3d electrons that triggers stripe SDW order. Another is that magnetic interactions produce a spin-nematic phase, which then induces orbital order. Here we report the observation by neutron powder diffraction of an additional fourfold-symmetric phase in Ba 1 À x Na x Fe 2 As 2 close to the suppression of SDW order, which is consistent with the predictions of magnetically driven models of nematic order.

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Pressure-induced Fermi-surface reconstruction in the iron-arsenide superconductor Ba1−xKxFe

Cited by 57 publications

References 19 publications

Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2

Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2

Polarized Light Microscopy Study on the Reentrant Phase Transition in a (Ba1 – xKx)Fe2As2 Single Crystal with x = 0.24

Magnetically driven suppression of nematic order in an iron-based superconductor

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