Dresden 2026 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 40: Transport in Materials: Diffusion, Charge, or Heat Conduction IV
MM 40.5: Vortrag
Freitag, 13. März 2026, 11:30–11:45, SCH/A216
Negative quadratic magnetoresistance generated by spin fluctuations in the metamagnetic bilayer strontium ruthenate Sr3Ru2O7 — •Bastien Michon1,2, Elisa Auffray1, Amir Meddas1, Zhiqiang Mao3, Freek Massee1, Pascale Senzier1, Claude Pasquier1, and Siham Benhabib1 — 1Laboratoire de Physique des Solides - University of Paris-Saclay, Orsay, France — 2SOLEIL synchrotron, Saint Aubin, France — 3Eberly College of Science, The Pennsylvania State University, University Park, USA
The bilayer strontium ruthenate Sr3Ru2O7 hosts a metamagnetic transition around 8T and was widely studied for its quantum criticality characterized by its linear-in-temperature resistivity. While most prior work has focused on the magnetic field evolution of the resistivity exponent α, the magnetoresistance (MR) has received less attention. Our low-temperature relative MR measurements on high-purity single crystals reveal two key features absent from the literature:
1. a well-defined negative quadratic MR between 30 and 100K, consistent with enhanced spin fluctuations, and 2. a non-monotonic MR evolution at low temperature within the 1.6-12K range.
The metamagnetic MR peak around 8T reaches nearly 90% at the lowest temperatures, broadens with increasing temperature, shifts to lower fields, and completely disappears between 20-30K. At higher temperature, the MR changes sign and follows a perfect negative H* dependence, with maximum amplitude around 30-40K. These measurements provide the first detailed mapping of the MR in Sr3Ru2O7 across a broad temperature range and up to 14T.
Keywords: Strontium Ruthenate; Metamagnetism; Quantum Criticality; Negative Magnetoresistance; Spin Fluctuations