Effect of Ce doping on the structural, transport and magnetic properties of Sr₂IrO₄ epitaxial films

Abstract

Sr 2 IrO 4 is predicted to be superconducting and has received extensive attention in the field of high-temperature superconducting. Bulk Sr 2 IrO 4 can be converted to a metallic state by slight chemical doping. Here we studied the structure, morphology, transport and magnetism of (Sr 1−x Ce x ) 2 IrO 4 (x = 0, 0.0125, 0.025, 0.05) epitaxial films grown on (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.35 substrates. Unlike the bulk Sr 2 IrO 4 material, the doped Sr 2 IrO 4 epitaxial film maintains a wide range of Mott variable-range hopping characteristics in transport. Meanwhile, the magnetic properties and Raman characteristic peaks of the doped films become weakened, and the degree of weakening is proportional to the doping concentration. These observations can be attributed to the localization caused by disorder after Ce doping and the presence of structural defects. The epitaxial strain may result in important differences between Sr 2 IrO 4 epitaxial thin films and bulk single crystals.

Enhanced magnetism and persistent insulating state in Mn doped Sr2IrO4

“…What is more interesting is that another λ-like feature appears at low temperature region ( 15 K) of the M ∼ T curves in the 0.06 x 0.2 samples. To our best knowledge, no previous literature have reported this low temperature λ-like feature in undoped or doped Sr 2 IrO 4 systems [21][22][23][24][26][27][28][29]. Thus it is suggested that this feature is originated from the magnetism of Mn ions.…”

“…For examples, a lot of rare earth elements have been chosen to dope at the Sr site of Sr 2 IrO 4 . In spite of a few reports of insulating-to-metal transition in doped single crystals, in most cases, the Sr 2−x RE x IrO 4 (RE = rare earth elements) polycrystalline samples exhibit insulating behaviors at low temperatures [21][22][23][24]. Besides, a recent work reports a persistent insulating state of Sr 2 IrO 4 upon application of pressure up to megabar [25].…”

WO3 Nanosheet-Supported IrW Alloy for High-Performance Acidic Overall Water Splitting with Low Ir Loading

“…The Raman spectra of both samples display the characteristic peaks of the crystalline WO 3 (Figure e) . In addition to the Raman peaks of 357 and 451 cm –1 that represent the basic vibration mode of the crystalline WO 3 , two extra peaks at 275 and 784 cm –1 for IrW/WO 3 -NS-A indicate the stretching vibration of W–O–W binding, reflecting the distortion of WO 3 framework due to the introduced Ir. − …”

Pressure driven structural phase transitions and modulations in optical properties of lanthanum nitride: an account from on the fly molecular dynamics and SCF vis-à-vis non-SCF first-principle calculations

“…Exploring the optical and electronic properties of rare-earth (RE) compounds have been a challenging field of research now a days [1][2][3][4][5][6][7][8][9]. The primary driving force behind those studies rely on the fact that most RE compounds not only show nonlinear optical properties useful for second harmonic generations (SHGs) but also find wide applications as electro-optic components, optical fibers, laser diodes and in solar cells [10][11][12][13][14].…”