Publications of M. Köppen

Lang, M.; Köppen, M.; Gegenwart, P.; Cichorek, T.; Thalmeier, P.; Steglich, F.; Ochiai, A.: Evidence for magnons and solitons in the one-dimensional S = 1/2 antiferromagnet Yb₄As₃. Physica B 281-282, pp. 458 - 459 (2000)

Steglich, F.; Köppen, M.; Gegenwart, P.; Cichorek, T.; Wand, B.; Lang, M.; Thalmeier, P.; Schmidt, B.; Aoki, H.; Ockiai, A.: MAGNON AND SOLITON EXCITATIONS IN THE CARRIER-POOR, ONE-DIMENSIONAL S = 1/2 ANTIFERROMAGNET Yb₄As₃. Acta Physica Polonica A 97 (1), pp. 1 - 10 (2000)

Köppen, M.; Lang, M.; Helfrich, R.; Steglich, F.; Thalmeier, P.; Schmidt, B.; Wand, B.; Pankert, D.; Benner, H.; Aoki, H. et al.; Ochiai, A.: Solitary Magnetic Excitations in the Low-Carrier Density, One-Dimensional S = 1/2 Antiferromagnet Yb₄As₃. Physical Review Letters 82 (22), pp. 4548 - 4551 (1999)

Müller, J.; Köppen, M.; Lang, M.; Steglich, F.; Trovarelli, O.; Sasaki, T.; Toyota, N.: Field-induced low-temperature anomaly in κ-(D₈-BEDT-TTF)₂Cu(NCS)₂. Synthetic Metals 103, pp. 1889 - 1890 (1999)

Helfrich, R.; Köppen, M.; Lang, M.; Steglich, F.; Ochiai, A.: New observations concerning the low-temperature properties of the carrier-poor heavy-fermion system Yb₄As₃. Journal of Magnetism and Magnetic Materials 177-181, pp. 309 - 310 (1998)

Köppen, M.; Pankert, D.; Hauptmann, R.; Lang, M.; Weiden, M.; Geibel, C.; Steglich, F.: Interference of a first-order transition with the formation of a spin-Peierls state in α′-NaV₂O₅. Physical Review B 57 (14), pp. 8466 - 8471 (1998)

Weiden, M.; Hauptmann, R.; Geibel, C.; Köppen, M.; Müller, J.; Lang, M.; Steglich, F.; Weiden, N.; Fischer, M.; Lemmens, P. et al.; Güntherodt, G.: Magnetic and crystallographic investigations of the inorganic spin-Peierls system α′-NaV₂O₅. Journal of Magnetism and Magnetic Materials 177-181, pp. 743 - 745 (1998)

Gegenwart, P.; Lohmann, M.; Lang, M.; Helfrich, R.; Langhammer, C.; Köppen, M.; Geibel, C.; Steglich, F.; Assmus, W.: Non-Fermi-liquid behavior in CeCu₂Si₂ at the disappearance of the presumably magnetically ordered "A-phase". Physica B 203-232, pp. 572 - 575 (1997)

Köppen, M.; Kromer, F.; Lang, M.; Steglich, F.; Sasaki, T.; Toyota, N.; Tajima, H.: Thermal-Expansion Studies on the Low-T Phase Diagram of α-(BEDT-TTF)₂KHg(SCN)₄. Synthetic Metals 86, pp. 2059 - 2060 (1997)

Sparn, G.; Deppe, M.; Donnevert, L.; Geibel, C.; Hellmann, P.; Heuser, K.; Köppen, M.; Lang, M.; Laube, F.; Link, A. et al.; Thomas, S.; Steglich, F.: Multiple magnetic phase transitions in Ce(Cu_1-xNi_x)₂Ge₂. Physica B 230-232, pp. 317 - 320 (1997)

Weiden, M.; Hauptmann, R.; Richter, W.; Geibel, C.; Hellmann, P.; Köppen, M.; Steglich, F.; Fischer, M.; Lemmens, P.; Güntherodt, G. et al.; Krimmel, A.; Nieva, G.: Magnetic phase diagram of CuGe_1-xSi_xO₃. Physical Review B 55 (22), pp. 15067 - 15075 (1997)

Lang, M.; Gegenwart, P.; Helfrich, R.; Köppen, M.; Kromer, F.; Langhammer, C.; Geibel, C.; Steglich, F.; Kim, J. S.; Stewart, G. R.: Non-Fermi-Liquid properties and exotic Superconductivity in CeCu₂Si₂ and (UTh)Be₁₃. In: Electronic Correlations and Materials Properties (Ed. Gonis, A.). Kluwer/Plenum, New York (1999)

Köppen, M.: Thermodynamische Untersuchungen der Spin-Peierls-Systeme CuGeO₃ und α′-NaV₂O₅ sowie des ladungsträgerarmen Systems Yb₄As₃. Dissertation, Technische Universität Darmstadt, Darmstadt (1998)