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O: Fachverband Oberflächenphysik
O 45: Poster Spins on Surfaces at the Atomic Scale
O 45.6: Poster
Dienstag, 18. März 2025, 18:00–20:00, P2
Thermometry of a millikelvin scanning probe junction with spin-flip inelastic electron tunnelling spectroscopy — •Emilio Scontrino1,3, Stefan Schulte2,3, Taner Esat3, Markus Ternes1,3, Stefan Tautz1,3, and Ruslan Temirov2,3 — 1RWTH Aachen — 2Universität zu Köln — 3Forschungszentrum Jülich, PGI-3, Germany
Organic molecules attached to the apex of a scanning probe tip have recently emerged as promising sensors for electric and magnetic fields at atomic scales [1, 2, 3]. Here, we functionalize the tip of a millikelvin scanning tunnelling microscope (STM) [4] with a 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTCDA) molecule. We measure the inelastic spin-flip excitations of this molecular spin 1/2 system in an out-of-plane magnetic field of 7 T varying the temperature of the adiabatic demagnetization cryostat between 30 mK and 1.2 K. To perform thermometry of the STM junction we fit the temperature-dependent smearing of the spin-flip excitation spectra using the third-order perturbation theory in the Appelbaum-Anderson-Kondo framework [5].
[1] C. Wagner et al., Phys. Rev. Lett. 115, 026101 (2015) [2] B. Verlhac et al., Science 366 , 623 (2019) [3] T. Esat et al., Nat. Nano. 19, 1466 (2024) [4] T. Esat et al., Rev. of Sci. Instr. 92 (6) (2021) [5] M. Ternes, New J. Phys. 17, 063016 (2015)
Keywords: Scanning Probe Microscopy; Inelastic Spin-Flip Excitation; Organic Molecule