Thermodynamic properties, electron spin resonance and underlying spin model in Cu3Y(SeO3)2O2Cl
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We report a detailed study of the magnetic properties of the buckled kagome compound Cu3Y(SeO3)2O2Cl using heat capacity, magnetization, powder neutron diffraction, electron spin resonance and first-principles calculations. The crystal structure is confirmed to be isotypic with the mineral francisite, with orthorhombic space group symmetry Pmmn throughout the temperature range 5 – 300 K. Magnetization, heat capacity and neutron diffraction confirm long range magnetic order below TN = 35 K. The electron spin resonance spectra reveal the presence of two modes corresponding to two different crystallographic Cu positions. The principal g-values of the g-tensor of Cu(1) sites were found to be g1 = 2.18(4), g2 = 2.10(6) and g3 = 2.05(9), while the effective g-factor of Cu(2) sites is almost isotropic and is on average g = 2.09(5). At low temperatures, Cu3Y(SeO3)2O2Cl undergoes a metamagnetic transition, with a critical field BC = 2.6 T at 2 K, due to the suppression of the inter-plane exchange interactions and saturates in modest magnetic field, BS ≤8 T. The first-principles calculations allow an estimation of both intra-plane and inter-plane exchange interactions. The weakness of the inter-plane exchange interaction results in low values of the critical fields for the metamagnetic transition, while the competition between intra-plane exchange interactions of different signs results in a similarly low value of the saturation field.
Zakharov , K V , Zvereva , E A , Berdonosov , P S , Kuznetsova , E S , Dolgikh , V A , Clark , L M , Black , C , Lightfoot , P , Kockelmann , W , Pchelkina , Z V , Streltsov , S V , Volkova , O S & Vasiliev , A N 2014 , ' Thermodynamic properties, electron spin resonance and underlying spin model in Cu 3 Y(SeO 3 ) 2 O 2 Cl ' Physical Review. B, Condensed matter and materials physics , vol 90 , 214417 . DOI: 10.1103/PhysRevB.90.214417
Physical Review. B, Condensed matter and materials physics
©2014 American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://dx.doi.org/10.1103/PhysRevB.90.214417
DescriptionThe collaboration between the University of St Andrews and Moscow State University was funded by a Royal Society International Exchanges grant, in collaboration with the RFBR (12-03-92604). P.L. and L.C. also thank the Leverhulme Trust (Award RPG-2013-343).
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