Superconducting Scanning Tunneling Microscope Tip to Reveal Sub-millielectronvolt Magnetic Energy Variations on Surfaces

Abstract

Combining the complex ordering ability of molecules with their local magnetic properties is a little-explored technique to tailor spin structures on surfaces. However, revealing the molecular geometry can be demanding. Nickelocene (Nc) molecules present a large spin-flip excitation leading to clear changes of conductance at the excitationthreshold bias. Using a superconducting tip, we have the energy resolution to detect small shifts of the Nc spin-flip excitation thresholds, permitting us to reveal the different individual environment of Nc molecules in an ordered layer. This knowledge allows us to reveal the adsorption configuration of a complex molecular structure formed by Nc molecules in different orientations and positions. As a consequence, we infer that Nc layers present a strong non-collinear magnetic moment arrangement.

Atomic manipulation of in-gap states in theβ−Bi2Pdsuperconductor

“…The experimental data were taken using a home-built dilution fridge STM at T = 30 mK and in ultrahigh vacuum at the IBS Center for Quantum Nanoscience [36]. The very low temperature leads to a negligible thermal smearing granting a resolution higher than the one obtained by a superconducting tip [38][39][40]. We used a metallic PtIr tip that permitted us to use the differential conductance dI/dV as a direct measurement of the density of states of the substrate (refer to the Supplemental Material [41] for more details).…”

Observation of Yu–Shiba–Rusinov States and Inelastic Tunneling Spectroscopy for Intramolecule Magnetic Exchange Interaction Energy of Terbium Phthalocyanine (TbPc) Species Adsorbed on Superconductor NbSe2

“…The tunneling electron causes an elementary excitation during the tunneling process (energy defined as ℏω ). , Applying the IETS technique to the superconducting substrate can generate higher-resolution spectroscopy due to the sharp width of the excitation feature of the superconductor. ,− For the SMM molecule, Burgess and co-workers investigated the intramolecule exchange interaction among the metal atoms of Fe 4 SMM molecule . Our study focuses on the metal–ligand exchange interaction, which is correlated with the blocking temperature of SMM.…”

Mixed-Sandwich Titanium(III) Qubits on Au(111): Electron Delocalization Ruled by Molecular Packing

“…An almost complete transfer of the Ti III unpaired electron is computed for one specific adsorption conformation inside the complex pattern, in agreement with spectroscopic results. In this respect, the behavior of [CpTi­(cot)] is significantly different from that of already investigated metallocenes such as ferrocene or nickelocene. ,,,, …”

“…In this respect, the behavior of [CpTi(cot)] is significantly different from that of already investigated metallocenes such as ferrocene or nickelocene. 13,14,16,32,33 The deposition of [CpTi(cot)] on the Au(111) surface, from here on [CpTi(cot)]@Au, results in a uniform and compact molecular monolayer shown in the large scale STM image of Figure 1b. Figure 1c,d shows the STM images at +2 and +1 V (empty states) of the area marked with a square in panel b.…”