Vehement competition of multiple superexchange interactions and peculiar magnetically disordered state in Cu(OH)F
| Autor: | Anna V. Merkulova, Olga S. Volkova, Yevgeniy Ovchenkov, Elena A. Zvereva, Alexander N. Vasiliev, Igor Morozov, I. L. Danilovich, Christian Balz, Tanusri Saha-Dasgupta, Badiur Rahaman, Hubertus Luetkens, Alexander A. Shakin, Anastasia Polovkova |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Phase transition
Materials science Magnetic structure Condensed matter physics General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetization Ferromagnetism Cu OH F static disorder Superexchange 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Isostructural 010306 general physics 0210 nano-technology Spectroscopy |
| Zdroj: | J. Phys. Soc. Jpn. Journal of the Physical Society of Japan |
| Popis: | The mixed anion copper compound Cu(OH)F was studied in measurements of dc- and ac-magnetic susceptibility, static and pulsed field magnetization, specific heat, X-band electron magnetic resonance and muon-spin spectroscopy. In variance with its layered structure, the magnetic behavior shows no evidence of low-dimensionality. Cu(OH)F reaches short range static antiferromagnetic order at TN = 9.5-11.5 K and experiences the spin-flop transition at B ∼ 3.5 T. This behavior is in a sharp contrast with physical properties of earlier reported isostructural compound Cu(OH)Cl. The first principle calculations reveal highly competitive nature of ferromagnetic and antiferromagnetic superexchange interactions, the details being rather sensitive to choice of magnetic structure employed in the extraction of magnetic interaction. Rather broad anomaly in Cp(T) dependence at phase transition and smeared magnetization curve M(B) at low temperatures suggest static disorder at low temperatures however no frequency dependence of the magnetization peak inherent for a spin-glass state was detected. Zero-field μSR data confirm transition into a static magnetically disordered state. The inter-substitutions of (OH)- and F- ions and relevant variations of exchange interaction parameters may be responsible for the formation of this peculiar ground state. © 2016 The Physical Society of Japan. |
| Databáze: | OpenAIRE |
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