Regensburg 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 26: Correlated Magnetism – Frustrated Systems
TT 26.9: Vortrag
Mittwoch, 19. März 2025, 11:45–12:00, H33
Exploring the Anisotropic Shastry-Sutherland Model by Strain Tuning of SrCu2(BO3)2 — •Francisco Lieberich1,4, Pascal Puphal2, Ekaterina Pomjakushina3, and Elena Gati1,4 — 1MPI-CPfS, Dresden, Germany — 2MPI-FKF, Stuttgart, Germany — 3PSI, Villigen, Switzerland — 4TUD, Dresden, Germany
The Shastry-Sutherland model is a hallmark of frustrated magnetism and is realized by SrCu2(BO3)2, where competing intra-dimer and inter-dimer interactions J and J′ stabilize a dimerized ground state. The Shastry-Sutherland model can be generalized to an anisotropic model with two sets of inequivalent couplings J1, J2 and J′1, J′2. This model is predicted to host novel ground states [1] and may address the debate [2] on the nature of the plaquette phase of SrCu2(BO3)2. Experimentally, anisotropic strains break the lattice symmetry of SrCu2(BO3)2 and may therefore be used to tune the anisotropy in the Shastry-Sutherland model. We use the AC elastocaloric effect, a thermodynamic probe of strain-tuned quantum materials [3], to map out the entropic landscape of SrCu2(BO3)2 under large anistropic strains. By comparing the results under [100] and [110] strain, we disentangle the effects of symmetry-breaking and symmetry-conserving strains on SrCu2(BO3)2. Our phase diagrams reveal features consistent with hydrostatic-pressure studies [4], alongside new effects that may arise from symmetry breaking.
Supported by the DFG through SFB 1143.
[1] Boos et al., PRB 100, 140413(R) (2019);
[2] Zayed et al., Nat. Phys. 13, 962 (2017);
[3] Ikeda et al., RSI 90, 083902 (2019);
[4] Guo et al., PRL 124, 206602 (2020).
Keywords: Elastocaloric Effect; Uniaxial Pressure; Strain; Shastry-Sutherland