Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: f-Electron Systems
TT 25.7: Vortrag
Dienstag, 10. März 2026, 11:15–11:30, HSZ/0101
Tuning quadrupolar order in YbRu2Ge2 using uniaxial stress — •Arindam Ghara1, Caitlin I. O’Neil1, Elena Gati1,2, You-Sheng Li3, Nubia Caroca-Canales1, Christoph Geibel1, Hilary Noad1, and Michael Nicklas1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Goethe University Frankfurt, Germany — 3National Taiwan University, Taiwan
Multipolar order has gained renewed attention due to its close connection with nematicity, altermagnetism, and quantum criticality. YbRu2Ge2 exhibits a ferroquadrupolar transition at TQ=10.2 K accompanied by a tetragonal-to-orthorhombic structural distortion [1,2]. Experimental studies [2] have proposed a B1g order parameter for the ferroquadrupolar ground state. According to theoretical work [3], a transverse field, such as a magnetic field along the c axis or a B2g stress, can drive YbRu2Ge2 towards a quantum critical point. This makes YbRu2Ge2 a model system for studying quadrupolar fluctuations under symmetry-resolved tuning parameters.
We used these tuning parameters to map the phase diagram of YbRu2Ge2 via resistance and Young’s modulus measurements. While the data under c-axis magnetic field behave as expected for a transverse field, the response to B2g stress is unexpected: the resistivity anomaly broadens, whereas the Young’s modulus anomaly stays sharp. This behaviour challenges the assumption that B2g stress acts purely as a transverse field.
[1] Jeevan et al., Phys. Rev. B 73, 020407 (2006)
[2] Rosenberg et al., PNAS 116, 7232 (2019)
[3] Maharaj et al., PNAS 114, 13430 (2017)
Keywords: Quadrupolar order; Uniaxial stress; Symmetry-resolved tuning; Young's modulus; Transverse field