The layered ferromagnet Cs2AgF4: Antiferromagnetic inter-layer coupling driven by magnetic dipole-dipole interactions
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Abstract
The layered fluoride Cs2AgF4 has been found to undergo a ferromagnetic-like phase transition below TC ≈ 14.5 K leading to magnetic saturation already at very low magnetic fields (H ≥ 10 kOe). We have explored the nature of this phase transition by studying the magnetization and specific heat under magnetic field and by evaluating the spin exchange interactions of Cs2AgF4 on the basis of density functional calculations as well as the magnetic dipole-dipole interaction energies for several ordered spin arrangements of Cs2AgF4. The magnetization exhibits an almost rectangular behavior with a small hysteresis indicating Cs2AgF4 to be a very soft ferromagnet with a coercitive field of H ≤ 20 Oe. The magnetization saturates at a value of ∼0.9 μB, in good agreement with the 4d9 configuration and a S = ½ ground state of Ag2+. Without applied external magnetic field (H = 0 Oe) the specific heat Cp exhibits an anomaly at TC that deviates considerably from a λ-type anomaly. When H is increased from 0, the Cp anomaly is smeared out without shifting its position, and eventually disappears for H > 200 Oe. This observation is ascribed to the presence of weak magnetic dipole-dipole inter-layer interactions which favor a weak antiferromagnetic coupling and just outweigh weak ferromagnetic inter-layer spin exchange interaction found from the density functional calculations.
© by Oldenbourg Wissenschaftsverlag, Stuttgart, Germany
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Articles in the same Issue
- Preface: 3rd International Symposium on Structure-Property Relationships in Solid State Materials (SPSSM-2010)
- Structures and negative thermal expansion properties of the one-dimensional cyanides, CuCN, AgCN and AuCN
- From phase-change materials to thermoelectrics?
- Effect of chromium disorder on the thermoelectric properties of Layered-antiferromagnet CuCrS2
- Copper mobility in CuFeS2, a layered trigonal phase obtained from LiCuFeS2
- Local structure of TiNiCu(Hf) shape memory alloys: XAFS data analysis
- Ce valence in intermetallic compounds by means of XANES spectroscopy
- Correlation of the local and the macroscopic properties of high-temperature superconductors
- Coexistence of Charge Density Waves and d-Wave Superconductivity in Cuprates. Sharing of the Fermi Surface
- The coherent state and its relation to the flat/steep band model
- The layered ferromagnet Cs2AgF4: Antiferromagnetic inter-layer coupling driven by magnetic dipole-dipole interactions
- High-spin to Intermediate-spin Transition, Insulator-metal Transition, and Antiferro- to Ferromagnetic Transition in SrFeO2 under High Pressure
- Pressure effects on energy gaps and phase transitions in ZnAl2Se4
- The effect of pressure on the structural and electronic properties of yttrium orthovanadate YVO4 compound: total-energy calculations
- Relationship between microstructure and photocatalytic properties of nanomaterials
- Semiconductor photocatalysts for the visible light absorption from wide-gap semiconductors with dopant modification
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