High-Resolution Magnetostriction Measurements of the Pauli-Limited Superconductor Sr 2 RuO 4
Year: 2026
Type: article
Abstract: We performed high-resolution magnetostriction measurements on the Pauli-limited superconductor Sr2RuO4 using high-quality single crystals. A first-order superconducting transition, accompanied by pronounced hysteresis, was observed under in-plane magnetic fields, where the relative length change of the sample, ΔL=L, was on the order of 10−8. To ensure the reliability of the measurements, particular attention was paid to minimizing the influence of magnetic torque, which can significantly affect data under in-plane field configurations, via field-angle-resolved magnetostriction. Within the hysteresis regime, slightly below the Pauli-limited upper critical field, a hump-like anomaly in the magnetostriction coefficient was identified. Furthermore, a characteristic double-peak structure in the field-angle derivative of the magnetostriction provides additional support for this anomaly. Although these findings may reflect a lattice response associated with the emergence of the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) phase in Sr2RuO4, the possibility of a broadened first-order transition cannot be excluded. Notably, this magnetostriction anomaly qualitatively deviates from the FFLO phase boundary suggested by previous NMR measurements, highlighting the necessity for further experimental and theoretical investigations to elucidate the nature of the FFLO state in this material. ©2026 The Physical Society of Japan.
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Field-temperature phase-diagram of a high quality ruthenate superconductor, Analyses of magnetic torque results based on Landau theory, Theoretical studies to establish experimental methods of determination of gap structures in unconventional superconductors, Theoretical studies of superconducting states with multiple phases in strongly correlated electron materials, G3557839090, Development of a sub-picometer dilatometer and its application to the research of novel superconducting phases under a precise control of the magnetic-field orientation, G4395567947, Novel quantum phenomena probed by multi-dimensional entropy landscape under magnetic field, G6534122582, G8089234069, G8150066232, G8160056266, 水素の生成・液化の機能を促進するトポロジカル量子物質の物性制御
OpenAlex ID: W7126776909
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