Diffraction by multipoles in a 5d2 rhenium double perovskite

Abstract

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Magnetic order and multipoles in the 5d2 rhenium double perovskite Ba2YReO6Thompson1, Marjerisson2, Badrtdinov3 et al. 2021Phys. Rev. B9180View full textAdd to dashboardCite

“…Having thus placed bounds on the range of possible ordered moments in Ba 2 YReO 6 , we return to the implications on the possible underlying multipolar order. From a recent atomic theory [39], the dipole magnetic moment is μ o = (2/3) sin(2χ ) μ B where χ is the mixing angle for nonmagnetic and magnetic components of the ground state.…”

Octupolar order and Ising quantum criticality tuned by strain and dimensionality: Application to $d$-orbital Mott insulators

“…In this paper, we focus on d 2 Mott insulators, where [20,21,27,28] have argued for a local J = 2 spin mo-ment, which can lead to various exotic orders including quadrupolar phases. We have recently reexamined this issue [29,30] and shown that virtual excitations into the high energy e g orbitals split the five-fold degeneracy of the J = 2 moment as 2(E g )⊕3(T 2g ), resulting in a ground state non-Kramers E g doublet carrying quadrupolar and octupolar moments.…”

Electronic Nematic Ordering Driven by Atomic-scale Multipoles

“…In contrast to magnetic orderings, the breaking of time-reversal (T ) symmetry is not necessary, and hence, qualitatively distinct low-energy excitations and physical phenomena are expected. The electronic nematic states have been discussed in various contexts, such as the Pomeranchuk instability [4][5][6], spin nematic state [7][8][9][10][11][12][13][14], and charge/orbital nematic state [15][16][17][18][19][20][21], which have been observed in d-electron materials like Ba 2 MgReO 6 [22][23][24] and f -electron materials, such as CeB 6 [25][26][27][28], PrPb 3 [29][30][31], PrT 2 X 20 (T = Ir, Rh, X = Zn; T = V, X = Al) [32][33][34][35][36], and CeCoSi [37][38][39][40][41][42][43]. Recently, further exotic states coexisting spin and nematic orders have been suggested, such as the CP 2 skyrmion [44][45][46][47] and other multiple-Q states [48]…”