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Christoph Sürgers

Dr. Christoph Sürgers

Akad. Direktor
Wernsdorfer
room3-07 (Geb. 30.23)
phone+49 721 608-43456
fax+49 721 608-46103
christoph suergersOhl9∂kit edu

www.phi.kit.edu

Superconductivity and magnetism in thin metallic films, multilayers, and nanostructures

We study the electronic transport properties of metallic thin films and nanostructures. Currently we are focussing on the anomalous or topological Hall effect in ferro- and antiferromagnetic films and single crystals, on the superconductive proximity-effect between two- and threedimensional systems, on the conductance through  rare-earth atomic contacts, and on the spininjection and -manipulation in CMOS-compatible heterostructures.

  • Spininjection and spinmanipulation in CMOS-compatible heterostructures

This is a cooperative project between the Physikalische Institut (PHI) and the Institute of Semiconductortechnology (IHT) at the University of Stuttgart. The goal is the demonstration of spininjection, -detection and –manipulation in CMOS-compatible devices. Carbon-doped Mn5Si3 und Mn5Ge3 compounds with Curie temperatures of 350 K and 450 K, respectively, will be used as ferromagnetic electrodes for spininjection into Ge-  and Si-based semiconductor heterostructures. Samples will be prepared by epitaxial growth in ultra-high vacuum and characterized by electronic transport measurements (Hanle-Effekt), optical measurements, and measurements of the Spin-Seebeck effect. The project is supported by the DFG.

Experimental methods

  • Preparation of thin films and multilayers by electron-beam evaporation in UHV and by magnetron sputtering
  • Mechanically controlled break-junctions
  • In-situ characterization by electron diffraction and Auger electron spectroscopy
  • x-ray diffraction
  • Scanning tunneling microscopy and spectroscopy between 5 and 300 K
  • Electronic transport measurements (resistivity, Hall effect, electric-field effect) at low temperatures and in magnetic fields

For a complete list of publications in peer-reviewed journals see

Christoph Sürgers

 

Publications of the last 5 years


2017
Signature of f-electron conductance in α-Cer single-atom contacts.
Kuntz, S.; Berg, O.; Sürgers, C.; Löhneysen, H. von.
2017. Physical review / B, 96, 085120. doi:10.1103/PhysRevB.96.085120
Quasi-metallic behavior of ZnO grown by atomic layer deposition : The role of hydrogen.
Beh, H.; Hiller, D.; Bruns, M.; Welle, A.; Becker, H.-W.; Berghoff, B.; Sürgers, C.; Merz, R.; Zacharias, M.
2017. Journal of applied physics, 122 (2), Art. Nr. 025306. doi:10.1063/1.4994175
Thermoelectric effects in superconductor-ferromagnet tunnel junctions on europium sulfide.
Kolenda, S.; Sürgers, C.; Fischer, G.; Beckmann, D.
2017. Physical review / B, 95 (22), Art. Nr. 224505. doi:10.1103/PhysRevB.95.224505
Large anomalous Hall effect in the non-collinear antiferromagnet Mn₅Si₃.
Sürgers, C.; Wolf, T.; Adelmann, P.; Kittler, W.; Fischer, G.; Löhneysen, H. von.
2017. DPG-Frühjahrstagung der Sektion Kondensierte Materie (SKM), Fachverband Tiefe Temperaturen, Dresden, 19.-24.März 2017
15 cm-1 to 12 000 cm-1 spectral coverage without changing optics: Diamond beam splitter adaptation of an FTIR spectrometer.
Strelnikov, D.; Kern, B.; Sürgers, C.; Kappes, M. M.
2017. Review of scientific instruments, 88 (2), 023118. doi:10.1063/1.4976744
Switching of a large anomalous Hall effect between metamagnetic phases of a non-collinear antiferromagnet.
Sürgers, C.; Wolf, T.; Adelmann, P.; Kittler, W.; Fischer, G.; Löhneysen, H. von.
2017. Scientific reports, 7, Art.Nr.: 42982. doi:10.1038/srep42982
2016
Two-band superconductivity of bulk and surface states in Ag thin films on Nb.
Tomanic, T.; Schackert, M.; Wulfhekel, W.; Sürgers, C.; Löhneysen, H. v.
2016. Physical review / B, 94 (22), Art.Nr.: 220503. doi:10.1103/PhysRevB.94.220503
Controlled electromigration and oxidation of free-standing copper wires.
Hauser, J. S.; Schwichtenberg, J.; Marz, M.; Sürgers, C.; Seiler, A.; Gerhards, U.; Messerschmidt, F.; Hensel, A.; Dittmeyer, R.; Löhneysen, H. v.; Hoffmann-Vogel, R.
2016. Applied physics / A, 122, 1068. doi:10.1007/s00339-016-0600-z
Magnetostrictive Fe_73Ga_27 nanocontacts for low-field conductance switching.
Kannan, U. M.; Kuntz, S.; Berg, O.; Kittler, W.; Basumatary, H.; Chelvane, J. A.; Sürgers, C.; Jammalamadaka, S. N.
2016. Applied physics letters, 108, Art. Nr. 242408. doi:10.1063/1.4953873
Second-Harmonic Generation from ZnO/Al2O3 Nanolaminate Optical Metamaterials Grown by Atomic-Layer Deposition.
Wickberg, A.; Kieninger, C.; Sürgers, C.; Schlabach, S.; Mu, X.; Koos, C.; Wegener, M.
2016. Advanced optical materials, 4 (8), 1203-1208. doi:10.1002/adom.201600200
Anomalous Hall effect in the noncollinear antiferromagnet Mn5Si3.
Sürgers, C.; Kittler, W.; Wolf, T.; Löhneysen, H. von.
2016. AIP Advances, 6 (5), Art. Nr.: 055604. doi:10.1063/1.4943759
2015
Remote control of magnetostriction-based nanocontacts at room temperature.
Jammalamadaka, S. N.; Kuntz, S.; Berg, O.; Kittler, W.; Kannan, U. M.; Chelvane, J. A.; Sürgers, C.
2015. Scientific Reports, 5, 13621. doi:10.1038/srep13621
2014
Large topological Hall effect in the non-collinear phase of an antiferromagnet.
Sürgers, C.; Fischer, G.; Winkel, P.; Löhneysen, H. von.
2014. Nature Communications, 5, Art.Nr. 3400. doi:10.1038/ncomms4400
Fabrication and magnetic characterization of nanometer-sized ellipses of the ferromagnetic insulator EuS.
Wolf, M. J.; Sürgers, C.; Fischer, G.; Scherer, T.; Beckmann, D.
2014. Journal of Magnetism and Magnetic Materials, 368, 49-53. doi:10.1016/j.jmmm.2014.04.067
Magnetotransport in ferromagnetic Mn₅Ge₃, Mn₅Ge₃C₀̣₈ and Mn₅Si₃C₀̣₈ thin films.
Sürgers, C.; Fischer, G.; Winkel, P.; Löhneysen, H. von.
2014. Physical Review B - Condensed Matter and Materials Physics, 90 (10), Art.-Nr. 104421. doi:10.1103/PhysRevB.90.104421
Spin-polarized quasiparticle transport in exchange-split superconducting aluminum on europium sulfide.
Wolf, M. J.; Sürgers, C.; Fischer, G.; Beckmann, D.
2014. Physical Review B - Condensed Matter and Materials Physics, 90 (14), Art.-Nr. 144509. doi:10.1103/PhysRevB.90.144509
Hanle-effect measurements of spin injection from Mn5Ge3C0.8/Al2O3-contacts into degenerately doped Ge channels on Si.
Fischer, I. A.; Chang, L.-T.; Sürgers, C.; Rolseth, E.; Reiter, S.; Stefanov, S.; Chiussi, S.; Tang, J.; Wang, K. L.; Schulze, J.
2014. Applied Physics Letters, 105 (22), Article Nr. 222408. doi:10.1063/1.4903233
Temperature-dependent scanning tunneling spectroscopy on the Si(557)-Au surface.
Sauter, M.; Hoffmann, R.; Sürgers, C.; Löhneysen, H. V.
2014. Physical Review B - Condensed Matter and Materials Physics, 89 (7), 075406/1-6. doi:10.1103/PhysRevB.89.075406
2013
Mn5Ge3C0.8 Contacts for Spin Injection Into Ge.
Fischer, I. A.; Sürgers, C.; Petit, M.; Thanh, V. L.; Schulze, J.
2013. ECS Transactions, 58 (9), 29-36. doi:10.1149/05809.0029ecst
Low temperature thermoelectric properties of Cu intercalated TiSe2: a charge density wave material.
Bhatt, R.; Basu, R.; Bhattacharya, S.; Singh, A.; Aswal, D. K.; Gupta, S. K.; Okram, G. S.; Ganesan, V.; Venkateshwarlu, D.; Sürgers, C.; Navaneethan, M.; Hayakawa, Y.
2013. Applied Physics A: Materials Science and Processing, 111 (2), 465-470. doi:10.1007/s00339-012-7536-8
Growth of Pd4S, PdS and PdS2 films by controlled sulfurization of sputtered Pd on native oxide of Si.
Bhatt, R.; Bhattacharya, S.; Basu, R.; Singh, A.; Deshpande, U.; Sürgers, C.; Basu, S.; Aswal, D. K.; Gupta, S. K.
2013. Thin Solid Films, 539, 41-46. doi:10.1016/j.tsf.2013.04.143
Ferromagnetic Mn 5Ge3C0.8 contacts on Ge: work function and specific contact resistivity.
Fischer, I. A.; Gebauer, J.; Rolseth, E.; Winkel, P.; Chang, L.-T.; Wang, K. L.; Sürgers, C.; Schulze, J.
2013. Semiconductor Science and Technology, 28 (12), Art.-Nr. 125002. doi:10.1088/0268-1242/28/12/125002
Electronic disorder of P- and B-doped Si at the metal-insulator transition investigated by scanning tunnelling microscopy and electronic transport.
Sürgers, C.; Wenderoth, M.; Löser, K.; Garleff, J. K.; Ulbrich, R. G.; Lukas, M.; Löhneysen, H. von.
2013. New journal of physics, 15 (5), 055009/1-19. doi:10.1088/1367-2630/15/5/055009
Optical absorption in silicon layers in the presence of charge inversion/accumulation or ion implantation.
Alloatti, L.; Lauermann, M.; Sürgers, C.; Koos, C.; Freude, W.; Leuthold, J.
2013. Applied Physics Letters, 103 (5), 051104/1-5. doi:10.1063/1.4817255