High-$T_{\mathrm{c}}$ superconductivity in undoped ThFeAsN

Abstract

Unlike the widely studied ReFeAsO series, the newly discovered iron-based superconductor ThFeAsN exhibits a remarkably high critical temperature of 30 K, without chemical doping or external pressure. Here we investigate in detail its magnetic and superconducting properties via muon-spin rotation/relaxation ($\mu$SR) and nuclear magnetic resonance (NMR) techniques and show that ThFeAsN exhibits strong magnetic fluctuations, suppressed below 35 K, but no magnetic order. This contrasts strongly with the ReFeAsO series, where stoichiometric parent materials order antiferromagnetically and superconductivity appears only upon doping. The ThFeAsN case indicates that Fermi-surface modifications due to structural distortions and correlation effects are as important as doping in inducing superconductivity. The direct competition between antiferromagnetism and superconductivity, which in ThFeAsN (as in LiFeAs) occurs at already zero doping, may indicate a significant deviation of the $s$-wave superconducting gap in this compound from the standard $s^{\pm }$ scenario.

arXiv comment6 pages, 5 figures

References in corpus (28)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• High-temperature superconductivity in iron-based materials
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Pnictogen height as a possible switch between high-T_c nodeless and low-T_c nodal pairings in the iron based superconductors
• Spin-polarized muons in condensed matter physics
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• The electronic phase diagram of the LaO1-xFxFeAs superconductor
• Properties of the Ideal Ginzburg-Landau Vortex Lattice
• Similarities between structural distortions under pressure and chemical doping in superconducting BaFe2As2
• ${}^{75}$As NMR studies of superconducting LaO${}_{0.9}$F${}_{0.1}$FeAs
• High - Temperature Superconductivity in Iron Based Layered Compounds
• Muon-spin rotation studies of SmFeAsO_0.85 and NdFeAsO_0.85 superconductors
• Superconducting Gap and Pseudogap in Iron-Based Layered Superconductor La(O${}_{1-x}$F${}_x$)FeAs
• A New ZrCuSiAs-Type Superconductor: ThFeAsN
• Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors
• Magnetic-superconducting phase boundary of SmFeAsO${}_{1-x}$F${}_x$ studied via muon spin rotation: Unified behavior in a pnictide family
• Superconductivity from repulsion in LiFeAs: novel s-wave symmetry and potential time-reversal symmetry breaking
• Correlation-enhanced odd-parity inter-orbital singlet pairing in the iron-pnictide superconductor LiFeAs
• Nanoscopic coexistence of magnetic and superconducting states within the FeAs layers of CeFeAsO1-xFx
• Long- to short-range magnetic order in fluorine-doped CeFeAsO
• La-substituted CaFeAsH superconductor with Tc = 47 K
• ThFeAsN in Relation to Other Iron-Based Superconductors
• Hydrogen-substituted superconductors SmFeAsO1-xHx misidentified as oxygen-deficient SmFeAsO1-x
• Muon Spin Rotation and the Vortex Lattice in Superconductors
• Intrinsic ferromagnetic impurity phases in SmFeAsO1-xFx detected by muSR
• Crossover between magnetism and superconductivity in low H-doped LaFeAsO

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• Exploring multichannel superconductivity in ThFeAsN
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