Evidence of spin singlet ground state in the frustrated antiferromagnetic ring Cr8Ni

TitleEvidence of spin singlet ground state in the frustrated antiferromagnetic ring Cr8Ni
Publication TypeJournal Article
Year of Publication2009
AuthorsFurukawa Y, Kiuchi K, Kumagai K, Ajiro Y, Narumi Y, Iwaki M, Kindo K, Bianchi A, Carretta S, Santini P, Borsa F, Timco GA, Winpenny REP
Journal TitlePhysical Review B
Volume79
Pages134416
Date Published04/01
ISBN Number1098-0121
Accession NumberISI:000265942800077
Keywordsanisotropy, antiferromagnetic materials, chromium alloys, cluster, complex, crystal, frustration, magnetic mobius strip, magnetisation, nickel alloys, nuclear magnetic resonance, specific heat, wheels
Abstract

The magnetic properties of an odd spin number antiferromagnetic ring Cr8Ni have been investigated by high-field magnetization, specific-heat, and nuclear-magnetic-resonance measurements at very low temperatures (below 1 K). It is found that the ground state of this frustrated spin ring is a singlet state with total spin value S-T=0 and zero expectation value of the local spins. The energy-level structure for low-lying excited total spin state S-T not equal 0 shows a breakdown of the Lande interval rule in agreement with theoretical results. Evidences of sizeable Dzyaloshinski-Moriya interactions have been found in the magnetic-field dependence of low-temperature specific-heat and magnetization data.

URL<Go to ISI>://000265942800077
DOI10.1103/Physrevb.79.134416