caa a22 4500 528785931 20190713030955.0 cr unu---uuuuu 180924s2016 xx s 000 0 eng 10.3929/ethz-b-000124193 doi 10.1038/ncomms13611 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/124193 Critical exponents and scaling invariance in the absence of a critical point [Elektronische Daten] [Niculin Saratz, Danilo A. Zanin, Urs Ramsperger, Sergio A. Cannas, Danilo Pescia, Alessandro; id_orcid 0000-0003-1941-5989 Vindigni] Nat Commun Open access ethresearch The paramagnetic-to-ferromagnetic phase transition is classified as a critical phenomenon due to the power-law behaviour shown by thermodynamic observables when the Curie point is approached. Here we report the observation of such a behaviour over extraordinarily many decades of suitable scaling variables in ultrathin Fe films, for certain ranges of temperature T and applied field B. This despite the fact that the underlying critical point is practically unreachable because protected by a phase with a modulated domain structure, induced by the dipole-dipole interaction. The modulated structure has a well-defined spatial period and is realized in a portion of the (T, B) plane that extends above the putative critical temperature, where thermodynamic quantities do not display any singularity. Our results imply that scaling behaviour of macroscopic observables is compatible with an avoided critical point. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Saratz Niculin joint author Zanin Danilo A. joint author Ramsperger Urs joint author Cannas Sergio A. joint author Pescia Danilo joint author Vindigni Alessandro; id_orcid 0000-0003-1941-5989 joint author Nature Communications London : Nature Publishing Group 7, p. 13611 2041-1723 http://hdl.handle.net/20.500.11850/124193 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/124193 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Saratz Niculin joint author ETHRESEARCH 700 1- Zanin Danilo A. joint author ETHRESEARCH 700 1- Ramsperger Urs joint author ETHRESEARCH 700 1- Cannas Sergio A. joint author ETHRESEARCH 700 1- Pescia Danilo joint author ETHRESEARCH 700 1- Vindigni Alessandro; id_orcid 0000-0003-1941-5989 joint author ETHRESEARCH 773 0- Nature Communications London : Nature Publishing Group 7, p. 13611 2041-1723 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access