Magnetic Resonance Study of the Spin-1/2 Quantum Magnet BaAg2Cu[VO4]2
-
Yulia Krupskaya
Abstract
BaAg2Cu[VO4]2 contains Cu(II) S=1/2 ions on a distorted two-dimensional triangular lattice interconnected via non-magnetic [VO4] entities. DFT band structure calculations, quantum Monte-Carlo simulations, and high-field magnetization measurements show that the magnetism of this compound is determined by a superposition of ferromagnetic (FM) and antiferromagnetic (AFM) uniform spin-1/2 chains with nearest neighbor exchange couplings of JFM=−19 K and JAFM=9.5 K (A. Tsirlin, A. Möller, B. Lorenz, Y. Skourski, H. Rosner, Phys. Rev. B 85 (2012) 014401). Here we report the study of BaAg2Cu[VO4]2 by high-field/frequency electron spin resonance (HF-ESR) and nuclear magnetic resonance (NMR) spectroscopies, which probe the local magnetic properties. In the HF-ESR measurements, we observe an anisotropic ESR spectrum typical for the Cu(II) ions and determine the g-tensor, g||=2.38 and g⊥=2.06. Moreover, we see a substantial change in the spectral shape of the ESR lines at low temperatures indicating the presence of short range magnetic correlations. The analysis of the low-temperature ESR spectra shows that its peculiar structure is due to the development of the anisotropic internal fields corresponding to FM and AFM correlations in the respective Cu spin chains. In the NMR spectra the signals from 51V nuclei in the two types of chains were identified. The analysis of the temperature evolution of these signals strongly supports the ESR findings on the occurrence of two types of Cu chains. Altogether, the HF-ESR and NMR results confirm theoretical predictions of the superposition of FM and AFM Cu(II) spin-1/2 chains in the studied material.
Dedicated to: Kev Salikhov on the occasion of his 80th birthday.
Acknowledgments
This work was supported by the Deutsche Forschungsgemeinschaft through Grants No. KA1694/8-1, WO 1532/3-2 and partially supported by the Russian Foundation for Basic Research through project RFBR 14-02-01194.
References
1. D. Baeriswyl, L. Degiorgi (Eds.), Strong Interactions in Low Dimensions. Kluwer Academic Publishers, Dordrecht (2004).10.1007/978-1-4020-3463-3Search in Google Scholar
2. N. E. Amuneke, D. E. Gheorghe, B. Lorenz, A. Möller, Inorg. Chem. 50 (2011) 2207.10.1021/ic1018554Search in Google Scholar
3. A. Tsirlin, A. Möller, B. Lorenz, Y. Skourski, H. Rosner, Phys. Rev. B 85 (2012) 014401.10.1103/PhysRevB.85.014401Search in Google Scholar
4. C. Golze, A. Alfonsov, R. Klingeler, B. Büchner, V. Kataev, C. Mennerich, H.-H. Klauss, M. Goiran, J.-M. Broto, H. Rakoto, S. Demeshko, G. Leibeling, F. Meyer, Phys. Rev. B 73 (2006) 224403.10.1103/PhysRevB.73.224403Search in Google Scholar
5. S. Stoll, A. Schweiger, J. Magn. Reson. 178 (2006) 42.10.1016/j.jmr.2005.08.013Search in Google Scholar
6. P. W. Anderson, P. R. Weiss, Rev. Mod. Phys. 25 (1953) 269.10.1103/RevModPhys.25.269Search in Google Scholar
7. R. J. Ford, M. A. Hitchman, Inorg. Chim. Acta 33 (1979) L167.10.1016/S0020-1693(00)89436-0Search in Google Scholar
8. M. D. Mermin, H. Wagner, Phys. Rev. Letters 17 (1966) 1133.10.1103/PhysRevLett.17.1133Search in Google Scholar
9. J. P. H. Benner, B. H. Boucher, in “Magnetic Properties of Layered Transition Metal Compounds” (Ed. L. I. Jongh) Kluwer Academic Publishers, Dordrecht (1990), P. 323.10.1007/978-94-009-1860-3_7Search in Google Scholar
10. C. J. Peters, R. J. Birgeneau, M. A. Kastner, H. Yoshizawa, Y. Endoh, J. Tranquada, G. Shirane, Y. Hidaka, M. Oda, M. Suzuki, and T. Murakami, Phys. Rev. B 37 (1988) 9761.10.1103/PhysRevB.37.9761Search in Google Scholar PubMed
11. E. A. Turov, Physical Properties of Magnetically Ordered Crystals, Academic Press, New York (1965).Search in Google Scholar
12. K. Nagata, Y. Tazuke, J. Phys. Soc. Jpn. 32 (1972) 337.10.1143/JPSJ.32.337Search in Google Scholar
13. T. Karasudani, H. Okamoto, J. Phys. Soc. Jpn. 43 (1977) 1131.10.1143/JPSJ.43.1131Search in Google Scholar
14. E. Vavilova, A. S. Moskvin, Y. C. Arango, A. Sotnikov, S.-L. Drechsler, R. Klingeler, O. Volkova, A. Vasiliev, V. Kataev, B. Büchner, EPL 88 (2009) 27001.10.1209/0295-5075/88/27001Search in Google Scholar
15. M. Schäpers, H. Rosner, S.-L. Drechsler, S. Süllow, R. Vogel, B. Büchner, A. U. B. Wolter, Phys. Rev. B 90 (2014) 224417.10.1103/PhysRevB.90.224417Search in Google Scholar
16. R. E. Wasylishen, S. E. Ashbrook, S. Wimperis. NMR of Quadrupolar Nuclei in Solid Materials. Willey, West Sussex (2012).Search in Google Scholar
17. A. Klümper, Eur. Phys. J B 5 (1998) 677.10.1007/s100510050491Search in Google Scholar
18. R. Feyerherm, S. Abens, D. Günther, T. Ishida, M. Meißner, M. Meschke, T. Nogami, M. Steiner, J. Phys. Cond. Mat. 12 (2000) 8495.10.1088/0953-8984/12/39/312Search in Google Scholar
©2017 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Preface
- Basic and Combination Cross-Features in X- and Q-band HYSCORE of the 15N Labeled Bacteriochlorophyll a Cation Radical
- An EPR Study of Small Magnetic Nanoparticles
- Magnetic Resonance Study of the Spin-1/2 Quantum Magnet BaAg2Cu[VO4]2
- Triarylmethyl Radicals: An EPR Study of 13C Hyperfine Coupling Constants
- Natural Abundance Nitrogen-15 NMR in Thermotropic Liquid Crystals With Cyano-Group
- Surface Hydroxyl OH Defects of η-Al2O3 and χ-Al2O3 by Solid State NMR, XRD, and DFT Calculations
- THz ESR study of Spinel Compound GeCo2O4
- Self-Association of Glycyrrhizic Acid. NMR Study
- A Site-Specific Study of the Magnetic Field-Dependent Proton Spin Relaxation of an Iridium N-Heterocyclic Carbene Complex
- Multifrequency Multiresonance EPR Investigation of Halogen-bonded Complexes Involving Neutral Nitroxide Radicals
- Electron Paramagnetic Resonance and DFT Analysis of the Effects of Bulky Perfluoroalkyl Substituents on a Vanadyl Perfluoro Phthalocyanine
- Coordination of the Mn4+-Center in Layered Li[Co0.98Mn0.02]O2 Cathode Materials for Lithium-Ion Batteries
- Triarylmethyl Radical: EPR Signal to Noise at Frequencies between 250 MHz and 1.5 GHz and Dependence of Relaxation on Radical and Salt Concentration and on Frequency
Articles in the same Issue
- Frontmatter
- Preface
- Basic and Combination Cross-Features in X- and Q-band HYSCORE of the 15N Labeled Bacteriochlorophyll a Cation Radical
- An EPR Study of Small Magnetic Nanoparticles
- Magnetic Resonance Study of the Spin-1/2 Quantum Magnet BaAg2Cu[VO4]2
- Triarylmethyl Radicals: An EPR Study of 13C Hyperfine Coupling Constants
- Natural Abundance Nitrogen-15 NMR in Thermotropic Liquid Crystals With Cyano-Group
- Surface Hydroxyl OH Defects of η-Al2O3 and χ-Al2O3 by Solid State NMR, XRD, and DFT Calculations
- THz ESR study of Spinel Compound GeCo2O4
- Self-Association of Glycyrrhizic Acid. NMR Study
- A Site-Specific Study of the Magnetic Field-Dependent Proton Spin Relaxation of an Iridium N-Heterocyclic Carbene Complex
- Multifrequency Multiresonance EPR Investigation of Halogen-bonded Complexes Involving Neutral Nitroxide Radicals
- Electron Paramagnetic Resonance and DFT Analysis of the Effects of Bulky Perfluoroalkyl Substituents on a Vanadyl Perfluoro Phthalocyanine
- Coordination of the Mn4+-Center in Layered Li[Co0.98Mn0.02]O2 Cathode Materials for Lithium-Ion Batteries
- Triarylmethyl Radical: EPR Signal to Noise at Frequencies between 250 MHz and 1.5 GHz and Dependence of Relaxation on Radical and Salt Concentration and on Frequency
