Tweed, twins, and holes

Magnetic properties of the In-doped MnWO4-type solid solutions Mn1−3In2□ WO4 [□=vacancy; 0≤x≤0.11]

“…Even though the bulk symmetry of In:MnWO 4 materials maintain the centrosymmetric space group P2/c the presence of a high amount of defects at Mn sites up to 11 at% indicates a strong distortion of the local Mn-O-Mn configuration, as confirmed by Raman spectroscopy [20]. Concerning the influence of local perturbations such as defects and strains in MFs on their dielectric and magnetic responses [21][22][23][24], the current study reports results from magnetic a.c. susceptibility, specific heat, and high-resolution neutron powder diffraction (HRNPD) to show the changes of the magnetic behavior in highly defective In:MnWO 4 materials.…”

Direct observation of polar tweed in LaAlO3

“…The highest concentration was predicted for a tweed structure, which is a densely interwoven network of domain walls202122232425. Tweed has another property: it will form a domain glass with a non-ergodic response to external forcing.…”

Ferroelastic Domain Boundary-Based Multiferroicity

“…The highest wall concentration was predicted for a tweed structure, which is a densely interwoven network of domain walls [23][24][25][26][27][28]. Domain glass [29,30] is vaguely akin to relaxors [31][32][33] although the local domain wall structures may be much better preserved.…”

“…For many applications, the aim is to produce high wall concentrations. The highest concentration of "domain boundaries" was predicted for a tweed structure, which is a densely interwoven network of domain walls [23][24][25][26][27][28]. Tweed has another property: it can form a domain glass with a nonergodic response to external forcing.…”

“…Domain glass [29,30] can contain polar nanoregions, which are known to exist in relaxor materials [31][32][33][34]. Complex domain structures, including tweed, may be stabilized by defects, while dynamic tweed [26] exists also for very low defect concentrations [35]. It was then argued that tweed structures are polar, either via the flexoelectric effect or via bilinear coupling between the strain and local dipole moments [36][37][38][39][40][41].…”