Anomalous magnetic and transport behavior in the magnetic insulatorSr3Ir2O

On the magnetic structure of Sr3Ir2O7: an x-ray resonant scattering study

“…A comparison of the experimental data with these calculations determined the alignment of the Ir J ef f = 1 2 magnetic moments to be along the c axis of a G-type antiferromagnet. This result explains the lack of zero-field magnetic susceptibility, measured along the [001] direction, reported previously [10]. However, the origins of the unusual low temperature, abplane behaviour, is a more complex problem and remains an intriguing mystery in this compound, the details of which we continue to pursue.…”

Evolution of magnetism in single-crystalCa2Ru1−xIrxYuan1, Terzic2, Wang3 et al. 2015Phys. Rev. BSelf Cite493751View full textAdd to dashboardCite

“…One profound result of this competition is that 5d-iridates exhibit complex magnetic states with high critical temperatures, such as Sr 2 IrO 4 (T N = 240 K) [22], Sr 3 Ir 2 O 7 (T N = 285 K) [31,32] and BaIrO 3 (T C = 183 K) [33,34]. It is established that the magnetic moment and ordering temperature are closely associated with the Ir-O-Ir bond angle Θ [35].…”

Tuning theJeff=12insulating state via electron doping and pressure in the double-layered iridate Sr3IrLi1, Kong2, Qi3 et al. 2013Phys. Rev. BSelf Cite

“…In particular, the bandwidth W of J eff = 1/2 band increases from 0.48 eV for n = 1 to 0.56 eV for n = 2 and 1.01 eV for n = ∞ and T D can be observed only when the system is field-cooled (FC) from above T C (Fig. 1b) [5].…”

“…The SOI is a relativistic effect proportional to Z 4 (Z is the atomic number), and has an approximate strength of 0.4 eV in the iridates (compared to around 20 meV in 3d materials), and splits the t 2g bands into states with J eff = 1/2 and J eff = 3/2, the latter having lower energy [7,8] (see Table 2). Since Ir 4+ (5d 5 ) ions provide five 5d-electrons to bonding states, four of them fill the lower J eff = 3/2 bands, and one electron partially fills the J eff = 1/2 band where the Fermi level E F resides. The J eff = 1/2 band is so narrow that even a reduced on-site Coulomb repulsion (U ~ The splitting between the J eff = 1/2 and J eff = 3/2 bands narrows as the dimensionality (i.e., n) increases in Sr n+1 Ir n O 3n+1 , and the two bands progressively broaden and contribute to the density of states (DOS) near the Fermi surface.…”