Imaging Anomalous Nematic Order and Strain in Optimally Doped 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>BaFe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:mi>As</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">P</mml:mi><mml:msub><mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Thewalt, Eric; Hayes, Ian; Hinton, James P.; Little, A.; Patankar, Shreyas; Wu, Liang; Helm, Toni; Stan, Camelia; Tamura, Nobumichi; Analytis, James; Orenstein, Joseph

doi:10.1103/physrevlett.121.027001

Cited by 32 publications

(45 citation statements)

References 41 publications

(55 reference statements)

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“…The best fit through the data points yields n = 1.5 ± 1.9 and T 0 = 13 ± 33 K. Although the exact relationship between ∆(T 1 T ) −1 and W 2 ∝ χ n is not known, it is interesting to note that this result is consistent with elastoresistance measurements, which indicate an enhanced χ n near a putative quantum critical point [10]. In contrast to torque magnetometry and optical measurements, our results show no evidence for a phase transition above T s , however the critical fluctuations persist well above the structural transition [44,45].…”

Section: −1contrasting

confidence: 32%

NMR Evidence for Inhomogeneous Nematic Fluctuations inBaFe2(As1−xP

et al. 2016

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Section: −1contrasting

confidence: 32%

NMR Evidence for Inhomogeneous Nematic Fluctuations inBaFe2(As1−xP

et al. 2016

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“…The surface nematic may be realization of the intermediate nematic state reported for P-doped 122 materials. 32,34 As several powerful experimental techniques, such as STM and ARPES, are inherently surface probes, the formation of preemptive surface nematic may strongly influence interpretation of experimental data.…”

Section: Discussionmentioning

confidence: 99%

Surface nematic order in iron pnictides

Song

Koshelev

2016

Phys. Rev. B

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Electronic nematicity plays important role in iron-based superconductors. These materials have layered structure and theoretical description of their magnetic and nematic transitions has been well established in two-dimensional approximation, i.e., when the layers can be treated independently. However, the interaction between iron layers mediated by electron tunneling may cause non-trivial three-dimensional behavior. Starting from the simplest model for orbital nematic in a single layer, we investigate the influence of interlayer tunneling on bulk nematic order and possible preemptive state where this order is only formed near the surface. We found that the interlayer tunneling suppresses the bulk nematicity which makes favorable formation of a surface nematic above the bulk transition temperature. The purely electronic tunneling Hamiltonian, however, favors alternating from layer-to-layer nematic order parameter in the bulk. The uniform bulk state typically observed experimentally may be stabilized by the coupling with the elastic lattice deformation. Depending on strength of this coupling, we found three regimes: (i) surface nematic and alternating bulk order, (ii) surface nematic and uniform bulk order, and (iii) uniform bulk order without the intermediate surface phase. The intermediate surface-nematic state may resolve the current controversy about the existence of the weak nematic transition in the compound BaFe2As2−xPx.

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“…The situation is different when the C 4 symmetry is explicitly or spontaneously broken to two-fold rotational (C 2 ) symmetry [40][41][42][43][44][45][46][47][48]. If the system undergoes a continuous density wave transition in metals with the C 2 symmetry [49][50][51][52][53], a new type of non-Fermi can emerge at the quantum critical point. Because different components of momentum receive different quantum corrections, the system can exhibit a stronger dynamical nesting.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic non-Fermi liquids

Sur

Lee

2016

Phys. Rev. B

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We study non-Fermi liquid states that arise at the quantum critical points associated with the spin density wave (SDW) and charge density wave (CDW) transitions in metals with twofold rotational symmetry. We use the dimensional regularization scheme, where a one-dimensional Fermi surface is embedded in 3 − ǫ dimensional momentum space. In three dimensions, quasilocal marginal Fermi liquids arise both at the SDW and CDW critical points : the speed of the collective mode along the ordering wavevector is logarithmically renormalized to zero compared to that of Fermi velocity. Below three dimensions, however, the SDW and CDW critical points exhibit drastically different behaviors. At the SDW critical point, a stable anisotropic non-Fermi liquid state is realized for small ǫ, where not only time but also different spatial coordinates develop distinct anomalous dimensions. The non-Fermi liquid exhibits an emergent algebraic nesting as the patches of Fermi surface are deformed into a universal power-law shape near the hot spots. Due to the anisotropic scaling, the energy of incoherent spin fluctuations disperse with different power laws in different momentum directions. At the CDW critical point, on the other hand, the perturbative expansion breaks down immediately below three dimensions as the interaction renormalizes the speed of charge fluctuations to zero within a finite renormalization group scale through a two-loop effect. The difference originates from the fact that the vertex correction anti-screens the coupling at the SDW critical point whereas it screens at the CDW critical point.

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Imaging Anomalous Nematic Order and Strain in Optimally Doped BaFe2(As,P)2

Cited by 32 publications

References 41 publications

NMR Evidence for Inhomogeneous Nematic Fluctuations inBaFe2(As1−xP

NMR Evidence for Inhomogeneous Nematic Fluctuations inBaFe2(As1−xP

Surface nematic order in iron pnictides

Anisotropic non-Fermi liquids

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