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| Content Provider | Springer Nature Link |
|---|---|
| Author | Sinha, K. P. Khandka, Sarita Masih, Piyush |
| Copyright Year | 2016 |
| Abstract | In the present paper a ground state anisotropic Heisenberg Hamiltonian is presented to study the magnetic properties of LnOFeAs (also called ‘1111’) compounds. In absence of any general consensus on the ground state Hamiltonian of iron pnictides, the present Hamiltonian emphasize the role of Fe–As interaction and its role on the magnetic properties of the iron pnictides. Based on the model an expression is obtained for sub lattice magnetization and Neel temperature (T$_{N}$) using Green’s function technique within random phase approximation. In the present model first nearest neighbours (J $_{1}$), second nearest neighbours (J $_{2}$), third nearest neighbours (J $_{3}$) exchange coupling along with out-of-plane Fe–As exchange coupling (J $_{⊥}$) is considered. Using the expression for Neel temperature, variation of Neel temperature (T$_{N}$) with J $_{⊥}$ has been studied. The effect of J $_{⊥}$ on the sublattice magnetization is also studied. For realistic values of exchange coupling constants, Neel temperature of LnOFeAs system (Ln = La, Pr, Ce) has been evaluated with and without out-of-plane exchange coupling. The theoretical results with out-of plane exchange couplings are found in good agreement with experimental results. |
| Starting Page | 279 |
| Ending Page | 284 |
| Page Count | 6 |
| File Format | |
| ISSN | 03698203 |
| Journal | Proceedings of the National Academy of Sciences, India Section A: Physical Sciences |
| Volume Number | 86 |
| Issue Number | 2 |
| e-ISSN | 22501762 |
| Language | English |
| Publisher | Springer India |
| Publisher Date | 2016-03-26 |
| Publisher Place | New Delhi |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Pnictides Applied and Technical Physics Heisenberg model Atomic, Molecular, Optical and Plasma Physics Quantum Physics Exchange interactions Physics Magnetic properties |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physics and Astronomy Biochemistry, Genetics and Molecular Biology |
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