Anomalous Temperature Behavior of the Chiral Spin Helix in CrNb_{3}S_{6} Thin Lamellae.

Autor: Togawa Y; Department of Physics and Electronics, Osaka Prefecture University, 1-1 Gakuencho, Sakai, Osaka 599-8531, Japan.; School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ United Kingdom., Kishine J; Division of Natural and Environmental Sciences, The Open University of Japan, Chiba 261-8586, Japan., Nosov PA; Department of Physics, St. Petersburg State University, St. Petersburg 198504, Russia.; NRC Kurchatov Institute, Petersburg Nuclear Physics Institute, Gatchina 188300, Russia., Koyama T; Department of Materials Science, Osaka Prefecture University, 1-1 Gakuencho, Sakai, Osaka 599-8531, Japan., Paterson GW; School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ United Kingdom., McVitie S; School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ United Kingdom., Kousaka Y; Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan., Akimitsu J; Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan., Ogata M; Department of Physics, the University of Tokyo, Hongo, Bunkyo, Tokyo 113-0033, Japan., Ovchinnikov AS; Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg 620083, Russia.; Institute for Metal Physics, Ural Division of RAS, Ekaterinburg 620137, Russia.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2019 Jan 11; Vol. 122 (1), pp. 017204.
DOI: 10.1103/PhysRevLett.122.017204
Abstrakt: Using Lorentz transmission electron microscopy and small-angle electron scattering techniques, we investigate the temperature-dependent evolution of a magnetic stripe pattern period in thin-film lamellae of the prototype monoaxial chiral helimagnet CrNb_{3}S_{6}. The sinusoidal stripe pattern appears due to formation of a chiral helimagnetic order (CHM) in this material. We found that as the temperature increases, the CHM period is initially independent of temperature and then starts to shrink above the temperature of about 90 K, which is far below the magnetic phase transition temperature for the bulk material T_{c} (123 K). The stripe order disappears at around 140 K, far above T_{c}. We argue that this cascade of transitions reflects a three-stage hierarchical behavior of melting in two dimensions.
Databáze: MEDLINE