The role of striction at magnetic and structural transitions in iron-pnictides

Abstract

We discuss the role of striction in the intertwined magnetic and structural phase transitions in the underdoped iron-pnictides. The magneto-elastic coupling to acoustic modes is then derived and estimated in framework of the multiband spectrum for itinerant electrons with nesting features. We argue that the 1-st order character of the magneto-elastic phase transition originates from the lattice instabilities near the onset of spin-density wave order introducing, thus, a shear acoustic mode as a new order parameter. Taking non-harmonic termis in the lattice energy into account may explain the splitting of the structural and magnetic transitions in some oxypnictides. Fluctuations of the magnetic order parameter show up in the precursory temperature dependence of the elastic moduli.

arXiv commentCorrected typo

References in corpus (15)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Theory of Electron Nematic Order in LaOFeAs
• Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
• The challenge of unravelling magnetic properties in LaFeAsO
• Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet
• Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study
• Phase transitions in LaFeAsO: structural, magnetic, elastic, and transport properties, heat capacity and Mossbauer spectra
• Fermi surface of superconducting LaFePO determined by quantum oscillations
• Magnetic Order of the Iron Spins in NdOFeAs
• Doping evoluton of antiferromagnetic order and structural distortion in LaFeAsO${}_{1-x}$F${}_x$
• The effect of internal pressure on the tetragonal to monoclinic structural phase transition in ReOFeAs: the case of NdOFeAs
• High Temperature Superconductivity in Transition Metal Oxypnictides: a Rare-Earth Puzzle?
• On superconducting and magnetic properties of iron-oxypnictides

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