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5 papers · 2 filters
Thermodynamics of the two-dimensional frustrated J1-J2 Heisenberg ferromagnet in the collinear stripe regime: Susceptibility and correlation length
M. Härtel, J. Richter, O. Götze +2
We calculate the temperature dependence of the correlation length xi and the uniform susceptibility chi_0 of the frustrated J1-J2 square-lattice Heisenberg ferromagnet in the colli…
Revealing the origin of the vertical hysteresis loop shifts in an exchange biased Co/YMnO bilayer
J. Barzola-Quiquia, A. Lessig, A. Ballestar +4
We have investigated exchange bias effects in bilayers composed by the antiferromagnetic o-YMnO and ferromagnetic Co thin film by means of SQUID magnetometry, magnetoresistance…
Optical and dc conductivities of cuprates: Spin-fluctuation scattering in the t-J model
A. A. Vladimirov, D. Ihle, N. M. Plakida
A microscopic theory of the electrical conductivity within the t-J model is developed. An exact representation for is obtained using the memory-function technique for…
Comment on: "Revealing common artifacts due to ferromagnetic inclusions in highly oriented pyrolytic graphite", by M. Sepioni, R.R. Nair, I.-Ling Tsai, A.K. Geim and I.V. Grigorieva, EPL 97 (2012) 47001
D. Spemann, M. Rothermel, P. Esquinazi +3
This comment addresses several issues in the paper by Sepioni et al., where it is stated that the ferromagnetism in pristine highly oriented pyrolytic graphite (HOPG) reported by s…
Electron-hole pair condensation at the semimetal-semiconductor transition: a BCS-BEC crossover scenario
B. Zenker, D. Ihle, F. X. Bronold +1
We act on the suggestion that an excitonic insulator state might separate---at very low temperatures---a semimetal from a semiconductor and ask for the nature of these transitions.…