Direct visualization of phase separation between superconducting and nematic domains in Co-doped CaFe2As2 close to a first order phase transition
arXiv:1710.02169 · doi:10.1103/PhysRevB.97.014505
Abstract
We show that biaxial strain induces alternating tetragonal superconducting and orthorhombic nematic domains in Co substituted CaFe2As2. We use Atomic Force, Magnetic Force and Scanning Tunneling Microscopy (AFM, MFM and STM) to identify the domains and characterize their properties, finding in particular that tetragonal superconducting domains are very elongated, more than several tens of micron long and about 30 nm wide, have the same Tc than unstrained samples and hold vortices in a magnetic field. Thus, biaxial strain produces a phase separated state, where each phase is equivalent to what is found at either side of the first order phase transition between antiferromagnetic orthorhombic and superconducting tetragonal phases found in unstrained samples when changing Co concentration. Having such alternating superconducting domains separated by normal conducting domains with sizes of order of the coherence length opens opportunities to build Josephson junction networks or vortex pinning arrays and suggests that first order quantum phase transitions lead to nanometric size phase separation under the influence of strain.
References in corpus (33)
- Skyrmion Lattice in a Chiral Magnet
- Fermi-liquid instabilities at magnetic quantum phase transitions
- "Deconfined" quantum critical points
- The Flux-Line Lattice in Superconductors
- Gap symmetry and structure of Fe-based superconductors
- Quantum phase transitions
- Quantum criticality
- A Sharp Peak of the Zero-Temperature Penetration Depth at Optimal Composition in BaFe2(As1-xPx)2
- Competition and coexistence of antiferromagnetism and superconductivity in underdoped Ba(Fe0.953Co0.047)2As2
- Competing order and nature of the pairing state in the iron pnictides
- Spectroscopic scanning tunneling microscopy insights into Fe-based superconductors
- Anisotropic Impurity-States, Quasiparticle Scattering and Nematic Transport in Underdoped Ca(Fe1-xCox)2As2
- Criticality in correlated quantum matter
- Interplay between magnetism and superconductivity in Fe-pnictides
- Intrinsic atomic scale modulations of the superconducting gap of 2H-NbSe2
- The Suprafroth (Superconducting Froth)
- Stabilization of an ambient pressure, collapsed tetragonal phase in CaFe2As2 and tuning of the orthorhombic / antiferromagnetic transition temperature by over 70 K by control of nano-precipitates
- Behavior of vortices near twin boundaries in underdoped
- Pair-breaking in iron-pnictides
- Evidence for time-reversal symmetry breaking of the superconducting state near twin-boundary interfaces in FeSe
- Control of magnetic, non-magnetic and superconducting states in annealed Ca(FeCo)As
- Stripe-like nanoscale structural phase separation and optimal inhomogeneity in superconducting BaPbBiO
- Hydrostatic-pressure tuning of magnetic, nonmagnetic and superconducting states in annealed Ca(FeCo)As
- How many quantum phase transitions exist inside the superconducting dome of the iron pnictides?
- Field dependence of the vortex core size probed by STM
- Atomic and electronic structures of ternary iron arsenides FeAs(001) surfaces (=Ba, Sr, or Ca)
- First-order quantum phase transitions: test ground for emergent chaoticity, regularity and persisting symmetries
- Effect of biaxial strain on the phase transitions of Ca(Fe1-xCox)2As2
- Impact of Iron-site defects on Superconductivity in LiFeAs
- Real Space Imaging of the Verwey Transition at the (100) Surface of Magnetite
- Effect of nonmagnetic impurities on superconductivity in the presence of incipient bands
- Two-dimensional array of diffusive SNS junctions with high-transparent interfaces
- First order quantum phase transitions
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