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TT: Fachverband Tiefe Temperaturen
TT 67: Unconventional Superconductors
TT 67.4: Vortrag
Donnerstag, 21. März 2024, 10:30–10:45, H 3007
Identification of the magnetic phase of Sr2RuO4 under uniaxial pressure through a.c. Young’s modulus measurements — •C.I. O’Neil1,2, Z. Hu1,2, N. Kikugawa3, D.A. Sokolov1, A.S. Gibbs2,4,5, A.P. Mackenzie1,2, H.M.L. Noad1, and E. Gati1 — 1MPI - CPfS, Dresden, Germany — 2University of St Andrews, UK — 3National Institute for Materials Science, Japan — 4ISIS Pulsed Neutron and Muon Source, UK — 5MPI - FKF, Stuttgart, Germany
Pressure tuning allows one to explore the link between electronic and lattice degrees of freedom in quantum materials. In this respect, Sr2RuO4 has recently been established as an important model system [1]. Here, under [1 0 0] strain, an electronic Lifshitz transition drives a giant lattice softening, giving rise to a strongly changing Young’s modulus, E(є). To further explore non-linear elasticity in quantum materials, we developed an a.c. technique to measure E(є). Owing to its improved resolution, we can clearly identify a response of the lattice to a magnetic transition, which has been reported to occur on the high-stress side of the Lifshitz transition [2]. Through the combination of the a.c. E(є) and a.c. elastocaloric measurements, we can revisit the phase diagram under [1 0 0] compression and discuss the interplay of magnetism with other electronic phases in Sr2RuO4. Furthermore, we can resolve a change in lattice relaxation upon entering this magnetic phase, extracted from the imaginary part of the a.c. response.
Work is supported by the DFG through TRR288 (Elasto-Q-Mat).
[1] Noad et al., Science 382 (2023) 6669
[2] Grinenko et al., Nat. Phys. 17 (2021) 748
Keywords: Uniaxial; Sr$_2$RuO$_4$; Pressure; Magnetism; Elasticity