Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 65: Frustrated Magnets: General I

TT 65.1: Vortrag

Donnerstag, 21. März 2024, 09:30–09:45, H 2053

Elastocaloric Effect of the Shastry-Sutherland Compound SrCu₂(BO₃)₂ under Uniaxial Pressure — •Francisco Lieberich¹, Pascal Puphal², Ekaterina Pomjakushina³, Andrew P. Mackenzie¹, and Elena Gati¹ — ¹MPI for Chemical Physics of Solids, Dresden, Germany — ²MPI for Solid State Research, Stuttgart, Germany — ³PSI, Villigen, Switzerland

SrCu₂(BO₃)₂ stands out as the prototypical system embodying the frustrated Shastry-Sutherland model, in which interacting dimers are arranged orthogonally on a square lattice. The intra- and inter-dimer interactions J and J′ can be tuned by hydrostatic pressure, leading to a sequence of quantum phase transitions with increasing coupling ratio J′/J [1]. The application of uniaxial pressure holds the potential to break the lattice symmetry and thereby to extend the study of the Shastry-Sutherland model to the case of two inequivalent dimers. This generalized model is predicted to give rise to novel ground states [2]. To determine the entropic landscape of SrCu₂(BO₃)₂ under compressive uniaxial pressure up to ∼ 1GPa, we utilize measurements of the AC elastocaloric effect, a thermodynamic probe for investigating strain-tuned quantum materials [3]. We compare and contrast our results with the phase diagram under hydrostatic pressure [1] to disentangle the effects of symmetry-breaking and symmetry-conserving strains on the Shasty-Sutherland lattice.

Work supported by the DFG through SFB 1143.

[1] Guo et al., Phys. Rev. Lett. 124 (2020) 206602

[2] Boos et al., Phys. Rev. B 100 (2019) 140413(R)

[3] Ikeda et al., Rev. Sci. Instrum. 90 (2019) 083902

Keywords: Elastocaloric Effect; Uniaxial Pressure; Shastry-Sutherland Model