Scale-Free Antiferromagnetic Fluctuations in thes=1/2Kagome Antiferromagnet Herbertsmithite

Autor:	Henrik M. Rønnow, Andrew Harrison, Gøran J. Nilsen, J. R. Stewart, M. A. de Vries, J. O. Piatek, Pascale P. Deen
Rok vydání:	2009
Předmět:	Physics Condensed matter physics Scattering Mott insulator General Physics and Astronomy engineering.material Neutron scattering Spinon Neutron spectroscopy engineering Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Herbertsmithite Quantum spin liquid
Zdroj:	Physical Review Letters. 103
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.103.237201
Popis:	Neutron spectroscopy and diffuse neutron scattering on herbertsmithite [ZnCu3(OH)(6)Cl-2], a near-ideal realization of the s=1/2 kagome antiferromagnet, reveal the hallmark property of a quantum spin liquid: instantaneous short-ranged antiferromagnetic correlations in the absence of a time-averaged ordered moment. These dynamic antiferromagnetic correlations are weakly dependent of neutron-energy transfer and temperature, and persist up to 25 meV and 120 K. At low energy transfers a shift of the magnetic scattering to low Q is observed with increasing temperature, providing evidence of gapless spinons. It is argued that these observations provide important evidence in favor of resonating-valence-bond theories of (doped) Mott insulators.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::920147161e52a276e79d932a8fad3295 https://doi.org/10.1103/physrevlett.103.237201 Zobrazit plný text záznamu