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Author Osquiguil, E.; Kaul, E.E.; Tosi, L.; Balseiro, C.A.
Title Effects of spin density wave quantization on the electrical transport in epitaxial Cr thin films Type Journal Article
Year 2012 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 85 Issue Pages 104410
Abstract We present measurements of the electrical resistivity ρ in epitaxial Cr films of different thicknesses grown on MgO (100) substrates, as a function of temperature T. The ρ(T) curves display hysteretic behavior in a certain temperature range, which is film thickness dependent. The hysteresis are related to the confinement of quantized incommensurate spin density waves (ISDW) in the film thickness. Our important finding is to experimentally show that the temperature Tmid where the ISDW changes from N to N+1 nodes decreases as the film thickness increases. Identifying Tmid with a first-order transition between ISDW states with N and N+1 nodes, and using a Landau approach to the free energy of the ISDW together with Monte Carlo simulations, we show that the system at high temperatures explores all available modes for the ISDW, freezing out in one particular mode at a transition temperature that indeed decreases with film thickness L. The detailed dependence of Tmid(L) seems to depend rather strongly on the boundary conditions at the Cr film interfaces.
Address Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400 Bariloche, Argentina
Corporate Author Thesis
Publisher American Physical Society Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title (up)
Series Volume Series Issue Edition
Area Expedition Conference
Notes Approved no
Call Number BT @ pedrazp @ Serial 640
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