Quasi-one-dimensional magnetism in the spin- 12 antiferromagnet BaNa2Cu(VO4)2
| Autor: | N. Ahmed, Jörg Sichelschmidt, Yuji Furukawa, Sebin J. Sebastian, Michael Baenitz, Pallab Bag, B. Koo, K. Somesh, Ramesh Nath, Alexander A. Tsirlin, M. Nandi |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Magnetism 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Heat capacity Magnetic susceptibility Crystallography 0103 physical sciences Saturation (graph theory) Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Isostructural 010306 general physics 0210 nano-technology Intensity (heat transfer) |
| Zdroj: | Physical Review B. 103 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.103.064413 |
| Popis: | We report synthesis and magnetic properties of quasi-one-dimensional spin-$\frac{1}{2}$ Heisenberg antiferromagnetic chain compound ${\mathrm{BaNa}}_{2}\mathrm{Cu}{({\mathrm{VO}}_{4})}_{2}$. This orthovanadate has a centrosymmetric crystal structure, $C2/c$, where the magnetic ${\mathrm{Cu}}^{2+}$ ions form spin chains. These chains are arranged in layers, with the chain direction changing by ${62}^{\ensuremath{\circ}}$ between the two successive layers. Alternatively, the spin lattice can be viewed as anisotropic triangular layers upon taking the interchain interactions into consideration. Despite this potential structural complexity, temperature-dependent magnetic susceptibility, heat capacity, electron spin resonance intensity, and nuclear magnetic resonance (NMR) shift agree well with the uniform spin-$1/2$ Heisenberg chain model with an intrachain coupling of $J/{k}_{\mathrm{B}}\ensuremath{\simeq}5.6$ K. The saturation field obtained from the magnetic isotherm measurement consistently reproduces the value of $J/{k}_{\mathrm{B}}$. Further, the $^{51}\mathrm{V}$ NMR spin-lattice relaxation rate mimics the one-dimensional character in the intermediate temperature range, whereas magnetic long-range order sets in below ${T}_{\mathrm{N}}\ensuremath{\simeq}0.25$ K. The effective interchain coupling is estimated to be ${J}_{\ensuremath{\perp}}/{k}_{\mathrm{B}}\ensuremath{\simeq}0.1$ K. The theoretical estimation of exchange couplings using band-structure calculations reciprocate our experimental findings and unambiguously establish the one-dimensional character of the compound. Finally, the spin lattice of ${\mathrm{BaNa}}_{2}\mathrm{Cu}{({\mathrm{VO}}_{4})}_{2}$ is compared with the chemically similar but not isostructural compound ${\mathrm{BaAg}}_{2}\mathrm{Cu}{({\mathrm{VO}}_{4})}_{2}$. |
| Databáze: | OpenAIRE |
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