Phase shift and magnetic anisotropy induced field splitting of impurity states in (Li1-xFex)OHFeSe superconductor

Abstract

Revealing the energy and spatial characteristics of impurity induced states in superconductors is essential for understanding their mechanism and fabricating new quantum state by manipulating impurities. Here by using high-resolution scanning tunneling microscopy/spectroscopy, we investigated the spatial distribution and magnetic field response of the impurity states in (Li1-xFex)OHFeSe. We detected two pairs of strong in-gap states on the "dumbbell" shaped defects. They display clear damped oscillations with different phase shifts and a direct phase-energy correlation. These features have long been predicted for classical Yu-Shiba-Rusinov (YSR) state, which are demonstrated here with unprecedented resolution for the first time. Moreover, upon applying magnetic field, all the in-gap state peaks remarkably split into two rather than shift, and the splitting strength is field orientation dependent. Via detailed numerical model calculations, we found such anisotropic splitting behavior can be naturally induced by a high-spin impurity coupled to anisotropic environment, highlighting how magnetic anisotropy affects the behavior of YSR states.

arXiv commentMain text with supplementary (accepted by Phys. Rev. Lett.)

References in corpus (28)

• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Majorana fermions in chains of magnetic atoms on a superconductor
• Imaging the Effects of Individual Zinc Impurity Atoms on Superconductivity in Bi2Sr2CaCu2O8+delta
• Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+d
• Spin-resolved Andreev levels and parity crossings in hybrid superconductor-semiconductor nanostructures
• Topological superconducting phase in helical Shiba chains
• Majorana fermions emerging from magnetic nanoparticles on a superconductor without spin-orbit coupling
• The role of magnetic anisotropy in the Kondo effect
• Interplay of magnetism and high-Tc superconductivity at individual Ni impurity atoms in Bi2Sr2CaCu2O8+d
• Phase Separation and Magnetic Order in K-doped Iron Selenide Superconductor
• Long range coherent magnetic bound states in superconductors
• Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films
• Two-dimensional p-wave superconducting states with magnetic moments on a conventional s-wave superconductor
• Tunneling processes into localized subgap states in superconductors
• Magnetic anisotropy in Shiba bound states across a quantum phase transition
• Tuning the coupling of an individual magnetic impurity to a superconductor: quantum phase transition and transport
• Orbital Picture of Yu-Shiba-Rusinov Multiplets
• Surface electronic structure and isotropic superconducting gap in (Li${}_{0.8}$Fe${}_{0.2}$)OHFeSe
• Mapping the orbital structure of impurity bound states in a superconductor
• Soft chemical control of superconductivity in lithium iron selenide hydroxides Li1-xFex(OH)Fe1-ySe
• Quantized conductance of Majorana zero mode in the vortex of the topological superconductor (Li0.84Fe0.16)OHFeSe
• Scrutinizing the double superconducting gaps and strong coupling pairing in (Li1-xFexOH)FeSe
• Magnetic anisotropy effects on quantum impurities in superconducting host
• Surface electronic structure and evidence of plain s-wave superconductivity in (Li0.8Fe0.2)OHFeSe
• Superconducting (Li, Fe)OHFeSe film of high quality and high critical parameters
• Kondo Signatures of a Quantum Magnetic Impurity in Topological Superconductors
• Zeeman effects on Yu-Shiba-Rusinov states
• Quasi two-dimensional nature of high-Tc superconductivity in iron-based (Li,Fe)OHFeSe

Cited by in corpus (6)

• Revealing the Microscopic Mechanism of Elementary Vortex Pinning in Superconductors
• Observation of Yu-Shiba-Rusinov-like states at the edge of CrBr3/NbSe2 heterostructure
• Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in K${}_3$C${}_{60}$
• High-Resolution Spectroscopy of the Intermediate Impurity States near a Quantum Phase Transition
• Dual Enhancement of Superconductivity in FeSe/SrTiO3 via Orbital and Correlation Synergy
• Extracting intrinsic superconducting properties in intercalated layered superconductors using an extended 2D Tinkham model