Lattice-driven magnetoresistivity and metal-insulator transition in single-layered iridates

Spin-orbit tuned metal-insulator transitions in single-crystal Sr2Ir1−xRhxQi1, Korneta2, Li3 et al. 2012Phys. Rev. BSelf Cite117101440View full textAdd to dashboardCite

“…2a, 2b and 2c. With increasing x, the c-axis magnetization M c becomes relatively stronger at µ o H=0.1 T. This is consistent with the reduced magnetic anisotropy in isothermal magnetization M(H) for x=0.11 at T=1.7 K and near µ o H=1 T, as shown in the inset in Fig.2b; the ratio M a /M c at lower fields (<2T) is significantly weaker for x=0.11 than for x=0 [10]. This change could be due to a change in the relative strength of SOI and tetragonal CEF as an enhanced tetragonal CEF due to the increased c/a ratio ( .2d).…”

“…elsewhere [6, [8][9][10]. The size of the single crystals is as large as 1.0 x 1.0 x 0.2 cm 3 (see Fig.1d).…”

Crystal growth and intrinsic magnetic behaviour of Sr2IrO4

“…Whereas Sr214#1 with the highest saturated moment shows a sharp peak at T = 215 K, Sr214#4 shows a broad hump peaked at a much lower temperature T = 175 K. Two anomalies are found in Sr214#2 and Sr214#3, suggesting coexistence of the two features seen in Sr214#1 and Sr214#4. It is noteworthy that previously published results share more resemblance to the broad profile of Sr214#4 rather than the sharp profile of Sr214#1 18,25 . Sr214#4 shows another anomaly in the low temperature region (inset of Fig.…”

“…Moreover, we note that previous studies on the parent Sr 2 IrO 4 and its sister compounds have shown significant variations in the magnetic properties even without doping, likely reflecting different defect concentrations 2,4,18,[22][23][24][25][26][27][28][29] . For example, the sizable c-axis component of the uniform magnetic susceptibility is not understood and seems incompatible with the known magnetic structure of Sr 2 IrO 4 .…”

Dimensionality-controlled Mott transition and correlation effects in single-layer and bilayer perovskite iridates

“…The delicate interplay between 25 electron correlations, SOC, inter-site hopping, and crystal field splitting leads to a strongly 26 competing ground state for the 5d TMOs, including the iridates. So far, a great amount of exotic 27 physics behaviors have been theoretically proposed to exist in the iridates, such as high-T c 28 superconductivity 2 , quantum spin Hall and correlated topological insulator effects 3,4,5,6 , and a…”