Phase transitions inLu2Ir3Si5

Electronically phase-separated charge-density waves in Lu2Ir3Si

“…9 Previous reports also strongly suggested that the CDW in Lu 2 Ir 3 Si 5 was also accompanied by a similar structural phase transition. 15 In the present study of CDW in Lu 2 Ir 3 Si 5 we find a new electronically phaseseparated CDW state in which CDW domains coexist with lowtemperature normal phase domains. We find that, with a change in temperature, incommensurability remains unchanged in the present case, unlike other typical IC CDW systems in which incommensurability varies with temperature, 9 and the predominant change is in the redistribution of the area ratio of the two coexisting phases with the expansion of CDW domains at lower temperatures.…”

“…The appearance of CDW superlattice spots becomes discernible at ∼140 K upon cooling, and upon warming from low temperatures, they disappear at ∼180 K, with a 40-K thermal hysteresis, consistent with the recent transport measurement. 15,19 In addition to the CDW superlattice spots, forbidden Bragg reflections (h0l), which violate the extinction condition of h, l = 2n, such as (-101), (-303), and so forth, can also be seen in Figs. 1(b) and 1(c), signifying a structural phase transition associated with the CDW transition.…”

“…Lu 2 Ir 3 Si 5 adopts an orthorhombic structure (U 2 Co 3 Si 5 , space group Ibam) at room temperature with lattice parameters that are determined to be a = 9.914 57(5)Å, b = 11.286 65(5)Å, c = 5.721 91(5)Å. 15 Recent transport measurements 15,19 of Lu 2 Ir 3 Si 5 have shown a pronounced phase transition between 100 and 200 K, with a huge thermal hysteresis of 40 K. In this paper, we report the observation of incommensurate or nearly commensurate satellite reflections associated with the CDW phase transitions by electron diffraction and real-space imaging of CDW domains using a satellite dark-field imaging technique in TEM. We confirm the 40-K thermal hysteresis in our studies and the cell-doubling structural transition at low temperatures that competes with the CDW phase and gives rise to the new electronically phase-separated CDW state.…”

Density wave like transport anomalies in surface doped Na2IrO3

“…Such transport anomalies have been observed previously for CDW transitions in many other materials. [21][22][23] The phase transition is first order as revealed by a 10 K thermal hysteresis between cooling and warming measurements. The most metallic (30 minutes etched) sample follows a T 2 Fermi liquid behavior at low temperature.…”

Magnetic properties of ferromagnetic Pu2Pt3Si5

“…For instance, mixed valence behavior has been reported for Ce 2 Ni 3 Si 5 [11], Ce 2 Rh 3 Si 5 [12], and Ce 2 Ir 3 Si 5 [13] while reentrant superconductivity below T N occurs in the antiferromagnet Tm 2 Fe 3 Si 5 [14]. Lu 2 Ir 3 Si 5 also becomes superconductoring below 3.5 K [15] and shows unusual thermodynamic and structural behaviors, such as a pronounced structural phase transition that develop 140 and 200 K [16]. Er 2 Ir 3 Si 5 exhibits Charge Density Wave (CDW) transition at 150 K [17].…”