scholarly journals Theory of half-metallic double perovskites. II. Effective spin Hamiltonian and disorder effects

2013 ◽  
Vol 87 (16) ◽  
Author(s):  
Onur Erten ◽  
O. Nganba Meetei ◽  
Anamitra Mukherjee ◽  
Mohit Randeria ◽  
Nandini Trivedi ◽  
...  
Keyword(s):  
Double Perovskites ◽  
Spin Hamiltonian ◽  
Effective Spin ◽  
Half Metallic ◽  
Disorder Effects

Huge magneto-optical effects in half-metallic double perovskites

2004 ◽  
Vol 70 (18) ◽  
Author(s):  
R. Vidya ◽  
P. Ravindran ◽  
A. Kjekshus ◽  
H. Fjellvåg
Keyword(s):  
Double Perovskites ◽  
Half Metallic ◽  
Optical Effects

scholarly journals Effective Hamiltonian for a half-filled asymmetric ionic Hubbard chain with alternating on-site interaction

2016 ◽  
Vol 30 (03) ◽  
pp. 1550260 ◽  
Author(s):  
I. Grusha ◽  
M. Menteshashvili ◽  
G. I. Japaridze
Keyword(s):  
Magnetic Field ◽  
Nearest Neighbor ◽  
Effective Hamiltonian ◽  
Heisenberg Chain ◽  
Spin Hamiltonian ◽  
Effective Spin ◽  
One Dimensional ◽  
The One ◽  
Strong Repulsion ◽  
Ionic Hubbard Model

We derive an effective spin Hamiltonian for the one-dimensional half-filled asymmetric ionic Hubbard model (IHM) with alternating on-site interaction in the limit of strong repulsion. It is shown that the effective Hamiltonian is that of a spin S = 1/2 anisotropic XXZ Heisenberg chain with alternating next-nearest-neighbor (NNN) and three-spin couplings in the presence of a uniform and a staggered magnetic field.

scholarly journals Inter-grain tunnelling in the half-metallic double-perovskites Sr2BB'O6(BB'= FeMo, FeRe, CrMo, CrW, CrRe)

2014 ◽  
Vol 75 ◽  
pp. 01001 ◽  
Author(s):  
B. Fisher ◽  
J. Genossar ◽  
K. B. Chashka ◽  
L. Patlagan ◽  
G. M. Reisner
Keyword(s):  
Double Perovskites ◽  
Half Metallic

scholarly journals Electronic structure of half-metallic double perovskites

2003 ◽  
Vol 68 (10) ◽  
Author(s):  
Z. Szotek ◽  
W. M. Temmerman ◽  
A. Svane ◽  
L. Petit ◽  
H. Winter
Keyword(s):  
Electronic Structure ◽  
Double Perovskites ◽  
Half Metallic

Room temperature half metallic ferromagnetism due to Os/Ir(5d) in double perovskites

2022 ◽  
Vol 896 ◽  
pp. 163130
Author(s):  
Qasim Mahmood ◽  
Ghazanfar Nazir ◽  
Sonia Bouzgarrou ◽  
M.S. Rashid ◽  
Eman Algrafy ◽  
...  
Keyword(s):  
Room Temperature ◽  
Double Perovskites ◽  
Half Metallic ◽  
Metallic Ferromagnetism ◽  
Half Metallic Ferromagnetism

scholarly journals Prediction of room-temperature half-metallicity in layered halide double perovskites

2019 ◽  
Vol 5 (1) ◽  
Author(s):  
Jian Xu ◽  
Changsong Xu ◽  
Jian-Bo Liu ◽  
Laurent Bellaiche ◽  
Hongjun Xiang ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Efficiency ◽  
Double Perovskites ◽  
Nanoscale Device ◽  
Half Metallicity ◽  
Thermal Stabilities ◽  
Half Metallic ◽  
Large Bulk ◽  
Device Applications ◽  
Ferromagnetic Ordering

AbstractHalf-metallic ferromagnets (HMFs) that possess intriguing physical properties with completely spin-polarized current are key candidates for high-efficiency spintronic devices. However, HMFs that could simultaneously have high Curie temperature (Tc), wide half-metallic gap (ΔHM), and large bulk magnetocrystalline anisotropy energy (MAE) are very rare, which significantly restrict their room-temperature (RT) applications. In this article, through materials screening in layered halide double perovskites (LHDPs), we have theoretically identified that Cs4FePb2Cl12, which has good crystallographic, dynamic and thermal stabilities, possesses an intrinsic half-metallic ground-state with a high Tc ~ 450 K. Interestingly, the long-range ferromagnetic ordering in bulk Cs4FePb2Cl12 is contributed by the strong super-superexchange interactions between the neighboring Fe d orbitals mediated by different anionic Cl p orbitals. The high Tc of layered Cs4FePb2Cl12 can be well maintained even in the monolayer limitation, i.e., Tc ~ 370 K for Cs4FePb2Cl12 monolayer, which is critical for nanoscale device applications. Moreover, both bulk and monolayer Cs4FePb2Cl12 can exhibit wide ΔHM ~ 0.55 eV and large MAE >320 μeV/Fe, comparable to that of the best HMFs reported in the literature. Our findings can significantly extend the potentials of LHDPs for high-temperature spintronic applications.

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