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Magnetic States in Quasi-2-D Iridium Oxides with Large Spin-orbit Coupling
Masaaki Isobe,Hirotaka Okabe,Jun Akimitsu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The magnetic states in the novel K2NiF4-type quasi-2-D spin-orbit-induced Mott insulatorBa2IrO4 was studied using magnetic susceptibility, muon spin rotation (µSR), and high-pressureresistivity measurements. In Ba2IrO4, a N´eel ordered state was found to be stabilized at temperaturesbelow TN (N´eel temperature) 240 K. The critical exponent β ~ 0.18 suggests a quasi-2-DHeisenberg antiferromagnetic state on the IrO2 planar square lattice. The magnetic moment issignificantly reduced to 0.34 µB/Ir-atom, probably due to a low-dimensional quantum spin fluctuationwith a large magnetic intra-plane correlation |J|. A non-Fermi liquid-like behavior withcarrier scattering due to the spin fluctuation was observed in the metallic state under high pressuresof more than 13.8 GPa.
Pressure-induced Metal-insulator Transition of the Mott Insulator Ba2IrO4
Daisuke Orii,Masafumi Sakata,Atsushi Miyake,Katsuya Shimizu,Hirotaka Okabe,Masaaki Isobe,Eiji Takayama-Muromachi,Jun Akimitsu 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The electrical resistivity of single crystals of the spin-orbit Mott insulator Ba2IrO4 has beenmeasured at pressures up to 30 GPa and at temperatures from 100 mK to 300 K. Ba2IrO4 showsa metal-insulator transition at around Pc = 24 GPa, though it does not show superconductivitydown to 100 mK. The low-temperature resistivity in the metallic state does not obey a conventionalFermi-liquid description. This suggests that carriers are incoherently scattered by antiferromagneticquantum spin fluctuations. The critical exponent for the metal-insulator transition is about 1.6,indicating that Ba2IrO4 is located near the boundary between a Mott and an Anderson insulator. This means that even in a single crystal, the effect of crystallographic disorder should not be ignored.