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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Cubic rashba effect in the surface spin structure of rare-earth ternary materials D. y. Usachov , I. a. Nechaev , G. Poelchen , M. Guttler , E. e. Krasovskii , S. Schulz , A. Generalov , K. Kliemt , A. Kraiker , C. Krellner , K. Kummer , S. Danzenbächer , C. Laubschat , A. p. Weber , J. Sánchez-Barriga , E. v. Chulkov , A. f. Santander-Syro , T. Imai , K. Miyamoto , T. Okuda , D. V. Vyalikh Physical Review Letters 124 DOI: 10.1103/PhysRevLett.124.237202 Diamond Proposal Number(s): [18844, 17761] Show Abstract ▼ Abstract: Spin-orbit interaction and structure inversion asymmetry in combination with magnetic ordering is a promising route to novel materials with highly mobile spin-polarized carriers at the surface. Spin-resolved measurements of the photoemission current from the Si-terminated surface of the antiferromagnet TbRh 2 Si 2 and their analysis within an ab initio one-step theory unveil an unusual triple winding of the electron spin along the fourfold-symmetric constant energy contours of the surface states. A two-band k ⋅ p model is presented that yields the triple winding as a cubic Rashba effect. The curious in-plane spin-momentum locking is remarkably robust and remains intact across a paramagnetic-antiferromagnetic transition in spite of spin-orbit interaction on Rh atoms being considerably weaker than the out-of-plane exchange field due to the Tb 4 f moments.	Jun 2020
I05-ARPES	Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr2Si2 Susanne Schulz , Ilya A. Nechaev , Monika Güttler , Georg Poelchen , Alexander Generalov , Steffen Danzenbächer , Alla Chikina , Silvia Seiro , Kristin Kliemt , Alexandra Yu. Vyazovskaya , Timur K. Kim , Pavel Dudin , Evgueni V. Chulkov , Clemens Laubschat , Eugene E. Krasovskii , Christoph Geibel , Cornelius Krellner , Kurt Kummer , Denis V. Vyalikh Npj Quantum Materials 4 DOI: 10.1038/s41535-019-0166-z Diamond Proposal Number(s): [18844, 17761] Open Access Show Abstract ▼ Abstract: The development of materials that are non-magnetic in the bulk but exhibit two-dimensional (2D) magnetism at the surface is at the core of spintronics applications. Here, we present the valence-fluctuating material EuIr2Si2, where in contrast to its non-magnetic bulk, the Si-terminated surface reveals controllable 2D ferromagnetism. Close to the surface the Eu ions prefer a magnetic divalent configuration and their large 4f moments order below 48 K. The emerging exchange interaction modifies the spin polarization of the 2D surface electrons originally induced by the strong Rashba effect. The temperature-dependent mixed valence of the bulk allows to tune the energy and momentum size of the projected band gaps to which the 2D electrons are confined. This gives an additional degree of freedom to handle spin-polarized electrons at the surface. Our findings disclose valence-fluctuating rare-earth based materials as a very promising basis for the development of systems with controllable 2D magnetic properties which is of interest both for fundamental science and applications.	Jun 2019

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