Schlegel, Christian
Permanent URI for this collectionhttps://hdl.handle.net/10222/44686
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Item Open Access Direct observation of quantum coherence in single-molecule magnets(American Physical Society, 2008) Schlegel, C.; Van Slageren, J.; Manoli, M.; Brechin, E. K.; Dressel, M.Direct evidence of quantum coherence in a single-molecule magnet in a frozen solution is reported with coherence times as long as T2=63030ns. We can strongly increase the coherence time by modifying the matrix in which the single-molecule magnets are embedded. The electron spins are coupled to the proton nuclear spins of both the molecule itself and, interestingly, also to those of the solvent. The clear observation of Rabi oscillations indicates that we can manipulate the spin coherently, an essential prerequisite for performing quantum computations. 2008 The American Physical Society.Item Open Access Angular momentum population in the fragmentation of Pb-208 at 1 GeV/nucleon(2002-06) Pfutzner, M.; Regan, PH; Walker, PM; Caamano, M.; Gerl, J.; Hellstrom, M.; Mayet, P.; Schmidt, KH; Podolyak, Z.; Mineva, MN; Aprahamian, A.; Benlliure, J.; Bruce, AM; Butler, PA; Gil, DC; Cullen, DM; Doring, J.; Enquist, T.; Fox, C.; Garces Narro, J.; Geissel, H.; Gelletly, W.; Giovinazzo, J.; Gorska, M.; Grawe, H.; Grzywacz, R.; Kleinbohl, A.; Korten, W.; Lewitowicz, M.; Lucas, R.; Mach, H.; O'Leary, CD; De Oliveira, F.; Pearson, CJ; Rejmund, F.; Rejmund, M.; Sawicka, M.; Schaffner, H.; Schlegel, C.; Schmidt, K.; Theisen, C.; Vives, F.; Warner, DD; Wheldon, C.; Wollersheim, HJ; Wooding, S.No abstract available.Item Open Access Gamma-ray spectroscopy with relativistic exotic heavy-ions(Indian Academy of Sciences, 2001) Mandal, Samit; Gerl, J.; Geissel, H.; Hauschild, K.; Hellstrom, M.; Janas, Z.; Kojouharov, I.; Kopatch, Y.; Lemmon, R. C.; Mayet, P.; Podolyak, Z.; Regan, P. H.; Schaffner, H.; Schlegel, C.; Simpson, J.; Wollersheim, H. J.Feasibility of gamma-ray spectroscopy at relativistic energies with exotic heavy-ions and new generation of germanium detectors (segmented Clover) is discussed. An experiment with such detector array and radioactive is discussed.Item Open Access Gd-based single-ion magnets with tunable magnetic anisotropy: Molecular design of spin qubits(American Physical Society, 2012) Martinez-Perez, M.; Cardona-Serra, S.; Schlegel, C.; Moro, F.; Alonso, P. J.; Prima-Garcia, H.; Clemente-Juan, J.; Evangelisti, M.; Gaita-Arino, A.; Sese, J.; Van Slageren, J.; Coronado, E.; Luis, F.We report ac susceptibility and continuous wave and pulsed EPR experiments performed on GdW10 and GdW30 polyoxometalate clusters, in which a Gd3+ ion is coordinated to different polyoxometalate moieties. Despite the isotropic character of gadolinium as a free ion, these molecules show slow magnetic relaxation at very low temperatures, characteristic of single molecule magnets. For T200mK, the spin-lattice relaxation becomes dominated by pure quantum tunneling events, with rates that agree quantitatively with those predicted by the Prokof'ev and Stamp model. The sign of the magnetic anisotropy, the energy level splittings, and the tunneling rates strongly depend on the molecular structure. We argue that GdW30 molecules are also promising spin qubits with a coherence figure of merit QM50. 2012 American Physical Society.Item Open Access Photoneutron cross sections for unstable neutron-rich oxygen isotopes(American Institute of Physics Inc, 2001) Leistenschneider, A.; Aumann, T.; Boretzky, K.; Cortina, D.; Cub, J.; Datta Pramanik, U.; Dostal, W.; Elze, Th W.; Emling, H.; Geissel, H.; Grunschlo, A.; Hellstr, M.; Holzmann, R.; Ilievski, S.; Iwasa, N.; Kaspar, M.; Kleinbohl, A.; Kratz, J. V.; Kulessa, R.; Leifels, Y.; Lubkiewicz, E.; Munzenberg, G.; Reiter, P.; Rejmund, M.; Scheidenberger, C.; Schlegel, C.; Simon, H.; Stroth, J.; Summerer, K.; Wajda, E.; Walus, W.; Wan, S.The evolution of giant dipole strength with neutron excess for the neutron-rich oxygen isotopes from A=17 to A=22 was measured systematically. It was found through all neutron-rich oxygen isotopes investigated that the dipole strength appears to be strongly fragmented within considerable fraction observed well below the giant dipole resonance, much in contrast to the dipole response of stable nuclei.Item Open Access Vertical nanowire light-emitting diode(American Institute of Physics Inc, 2004) Konenkamp, R.; Word, Robert C.; Schlegel, C.We report room-temperature, white-color electroluminescence in vertically oriented ZnO nanowires. Excitonic luminescence around 380 nm is observed as a shoulder on a broader defect-related band covering all of the visible range and centered at 620 nm. The ZnO nanowires are grown in a low-temperature process on SnO2 -coated glass substrates, employing a technique that is suitable for large-area applications. The nanowires are robustly encapsulated in a thin polystyrene film deposited from high-molecular-weight solutions. Electron injection occurs through the transparent SnO2 layer, while hole injection is mediated by a p -doped polymer and an evaporated Au contact. Stable device operation is observed at ambient conditions on the time scale of 1 h. 2004 American Institute of Physics.Item Open Access A portable MIMO testbed and selected channel measurements(2006) Goud, Paul, Jr.; Hang, Robert; Truhachev, Dmitri; Schlegel, ChristianNo abstract available.Item Open Access In-beam gamma ray and conversion electron study of Fm-250(2006-02) Bastin, JE; Herzberg, RD; Butler, PA; Jones, GD; Page, RD; Jenkins, DG; Amzal, N.; Brew, PMT; Hammond, NJ; Humphreys, RD; Ikin, PJC; Page, T.; Greenlees, PT; Jones, PM; Julin, R.; Juutinen, S.; Kankaanpaa, H.; Keenan, A.; Kettunen, H.; Kuusiniemi, P.; Leino, M.; Leppanen, AP; Muikku, M.; Nieminen, P.; Rahkila, P.; Scholey, C.; Uusitalo, J.; Bouchez, E.; Chatillon, A.; Hurstel, A.; Korten, W.; Le Coz, Y.; Theisen, C.; Ackermann, D.; Gerl, J.; Helariutta, K.; Hessberger, FP; Schlegel, C.; Wollerscheim, HJ; Lach, M.; Maj, A.; Meczynski, W.; Styczen, J.; Khoo, TL; Lister, CJ; Afanasjev, AV; Maier, HJ; Reiter, P.; Bednarczyc, P.; Eskola, K.; Hauschild, K.No abstract available.Item Open Access Traceable dynamic measurement of mechanical quantities: Objectives and first results of this european project(EDP Sciences, 2012) Bartoli, C.; Beug, M. F.; Bruns, T.; Elster, C.; Esward, T.; Klaus, L.; Knott, A.; Kobusch, M.; Saxholm, S.; Schlegel, C.Nine european national metrology institutes (NMIs) are collaborating in a new project funded by the european metrology research programme (EMRP) to establish traceable dynamic measurement of the mechanical quantities force, pressure, and torque. The aim of this joint research project (JRP) is to develop appropriate calibration methods, mathematical models, and uncertainty evaluation. The duration of the project is 3 years for a global amount of &euro3.6 million. It began in September 2011. EDP Sciences 2013.