Spin and orbital ordering in Y1−xLaxVO3

Abstract

The spin and orbital ordering in Y 1-x La x VO 3 (0.30 ≤ x ≤ 1.0) has been studied to map out the phase diagram over the whole doping range 0 ≤ x ≤ 1. The phase diagram is compared with that for RVO 3 (R = rare earth or Y) perovskites without A-site variance.For x > 0.20, no long-range orbital ordering was observed above the magnetic ordering temperature T N ; the magnetic order is accompanied by a lattice anomaly at a T t ≤ T N as in

Y1−xLaxVO3: Effects of doping on orbital ordering

“…Above 200 K, no evidence for orbital ordering has been observed, suggesting that the orbitals are fluctuating. This is corroborated by thermal conductivity measurements and Raman scattering experiments [6,25,26] that show unambiguously that the orbitals are fluctuating above T OO while some degree of orbital fluctuation is retained in the interval between T N < T < T OO . Complete static orbital order is only achieved below T CG .…”

“…When YVO 3 is doped with La 3+ as in Y 1−x La x VO 3 , it was previously shown that the T OO transition is quickly suppressed and disappears by x = 0.2 [6]. Coupled with this suppression is the disappearance of the transition to the monoclinic phase as well, in the 77 -200 K range, prior to reentering the orthorhombic phase.…”

“…The insulating Y 1−x La x VO 3 , a JT active system, has been of considerable interest due to its complex phase diagram [5][6][7][8][9][10][11][12][13] associated with orbital physics [14][15][16][17][18][20][21][22]. With cooling, the parent compound, YVO 3 , undergoes a transition to a G-type orbital ordering (anti-phase ordering along the c-axis, G-OO) at T OO ∼ 200 K, followed by a C -type antiferromagnetic spin ordering at T N ∼ 116 K (C-SO) and finally to an orbital flipping transition at T CG ∼ 77 K with C -type orbital ordering (in-phase ordering along the c-axis, C-OO) and G-type spin ordering (G-SO) [19,20].…”

Strong spin-lattice coupling in CrSiTe3

“…In order to calculate the entropy release across the magnetic transition, we estimated the lattice specific heat with the Thirring model. 27 The calculated entropy change is shown in the inset of Fig. 3.…”

Sub-GeV dark matter detection with electron recoils in carbon nanotubes

“…On the contrary, electrons injected in the body of nanotubes (or in the interstices) by DM-electron scatterings, might go through the walls, with definite transmission coefficients, and undergo multi-scattering events, crossing several nanotubes, before exiting from the array. As a benchmark for our analysis, we have used the results of some experimental studies on the determination of transmission coefficients of electrons through graphene planes [12][13][14][15][16]. More information from experiments of this kind would be extremely useful for determining directly also reflection and absorption coefficients.…”