Effects of Nematic Fluctuations on the Elastic Properties of Iron Arsenide Superconductors

Fernandes, Rafael M.; VanBebber, Lindsay; Bhattacharya, S.; Chandra, Premala; Keppens, Veerle; Mandrus, David; McGuire, Michael A.; Sales, B. C.; Sefat, Athena S.; Schmalian, Joerg

doi:10.1103/physrevlett.105.157003

Cited by 380 publications

(490 citation statements)

References 40 publications

Supporting

Mentioning

460

Contrasting

Unclassified

Order By: Relevance

“…The relation between the structural transition and the magnetic ordered phase has been a controversial issue, the understanding of which may provide insights into the pairing mechanism and symmetry. [2][3][4][5][6][7][8] To elucidate the origin of the structural transition above the magnetic order, spin-nematic theory 9,10) and orbital order theory 11,12) have been intensively proposed. The microscopic pictures of these theories are the spin-quadrupole order induced by the spin fluctuation 9) and the orbital-spin mode-coupling characterized by the Aslamazov-Larkin vertex correction, 12) respectively.…”

Section: Introductionmentioning

confidence: 99%

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

et al. 2018

View full text Add to dashboard Cite

The pressure dependence of the structural (Ts), antiferromagnetic (Tm), and superconducting (Tc) transition temperatures in FeSe is investigated on the basis of the 16-band d-p model. At ambient pressure, a shallow hole pocket disappears due to the correlation effect, as observed in the angular-resolved photoemission spectroscopy (ARPES) and quantum oscillation (QO) experiments, resulting in the suppression of the antiferromagnetic order, in contrast to the other iron pnictides. The orbital-polarization interaction between the Fe d orbital and Se p orbital is found to drive the ferro-orbital order responsible for the structural transition without accompanying the antiferromagnetic order. The pressure dependence of the Fermi surfaces is derived from the first-principles calculation and is found to well account for the opposite pressure dependences of Ts and Tm, around which the enhanced orbital and magnetic fluctuations cause the double-dome structure of the eigenvalue λ in the Eliashberg equation, as consistent with that of Tc in FeSe.

show abstract

Section: Introductionmentioning

confidence: 99%

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Some suggest that the nematicity is generated by the spin fluctuations, and is a precursor of the incipient antiferromagnetic state [12][13][14] . Another class of models emphasises the propensity towards orbital order of the iron 3d states in different environments [15][16][17][18] .…”

mentioning

confidence: 99%

Nematicity driven by hybridization in iron-based superconductors

Stanev

Littlewood

2013

Phys. Rev. B

View full text Add to dashboard Cite

In this paper we study an effective model for the normal state of iron-based superconductors. It has separate, but interacting itinerant and localized degrees of freedom, originating from the dxz and dyz, and from dxy iron orbitals respectively. At low temperatures, below a mean-field phase transition, these different states condense together in an excitonic order parameter. We show that at even lower temperature, after another phase transition, this ordered state can spontaneously break the C4 lattice symmetry and become nematic. We propose this mechanism as an explanation of the tendency towards nematicity observed in several iron-based compounds.Introduction. The discovery of high-temperature superconductivity in iron-based materials 1-3 is one of the most exciting recent developments in physics. It is almost certain that the origin of superconductivity is unconventional (i.e. driven by electron-electron interactions), and is very likely that the order parameter is unconventional as well 4,5 . The normal state properties of these materials, in contrast, at first seemed rather unremarkablea bad metal behavior at high temperatures, which can be followed by structural transition and antiferromagnetic phase at low temperatures. This simple picture was considerably complicated by the growing evidence of nematic fluctuations 6-8 or even long-range order 9 present in some compounds at temperatures well above the antiferromagnetic and structural transitions. Furthermore, this nematicity seems to be of purely electronic (rather than structural) origin 10 . Understanding this state and its connection to the other phases is an important milestone in the study of these materials.

show abstract

“…The roles of nematic fluctuations in shaping the magnetic and structural transitions and in the pairing mechanism that leads to superconductivity in the iron arsenides are under intense debate. 16,18 Here we report on high-resolution synchrotron x-ray diffraction studies of a CeFeAsO single crystal that enable us to separately monitor the development of each of the twin domains in this system. In particular, we examine the in-plane charge correlations as a function of temperature to gain insight on the two-dimensional (2D) coupling between the structural and magnetic properties of this typical ferropnictide.…”

mentioning

confidence: 99%

“…One of the consequences of the magnetic frustration is the possible emergence of nematic degrees of freedom 13 that can give rise to a short-range O order above T S . [14][15][16] However, directly probing nematic fluctuations is nontrivial due to the difficulties in unequivocally decoupling their effects from that of the twin domains, 17 as well as the fact that the magnetic field fluctuations associated with them average to zero. The roles of nematic fluctuations in shaping the magnetic and structural transitions and in the pairing mechanism that leads to superconductivity in the iron arsenides are under intense debate.…”

mentioning

confidence: 99%

Anisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction

Yan

Kim

et al. 2011

Phys. Rev. B

View full text Add to dashboard Cite

Single-crystal synchrotron X-ray diffraction studies of CeFeAsO reveal strong anisotropy in the charge correlation lengths along or perpendicular to the in-plane antiferromagnetic (AFM) wavevector at low temperatures, indicating an anisotropic two-dimensional magnetoelastic coupling. The high-resolution setup allows to distinctly monitor each of the twin domains by virtue of a finite misfit angle between them that follows the order parameter. In addition, we find that the in-plane correlations, above the orthorhombic (O)-to-tetragonal (T) transition, are shorter than those in each of the domains in the AFM phase, indicating a distribution of the in-plane lattice constants. This strongly suggests that the phase above the structural O-to-T transition is virtually T with strong O-T fluctuations that are probably induced by spin fluctuations.

show abstract

Effects of Nematic Fluctuations on the Elastic Properties of Iron Arsenide Superconductors

Cited by 380 publications

References 40 publications

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

Fermi Surface, Pressure-Induced Antiferromagnetic Order, and Superconductivity in FeSe

Nematicity driven by hybridization in iron-based superconductors

Anisotropic magnetoelastic coupling in single-crystalline CeFeAsO as seen via high-resolution x-ray diffraction

Contact Info

Product

Resources

About