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We performed ultra-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, ∆L/L, was on the order of 10^(−8), requiring the use of highly sensitive detection techniques. 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 Bc2, 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. These findings may reflect a lattice response associated with the emergence of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase in Sr2RuO4. However, the phase boundary inferred from the magnetostriction data qualitatively deviates from that suggested by NMR measurements, highlighting the necessity for further experimental and theoretical investigations to elucidate the nature of the FFLO state in this material.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Sr2RuO4, superconductivity, Thermal expansion and Magnetostriction, FFLO

Date published: 2026-01-15

Publisher: Physical Society of Japan

Journal:

• Journal of the Physical Society of Japan (ISSN: 00319015) vol. 95 issue. 1 014704

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.7566/jpsj.95.014704

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Updated at: 2025-12-13 08:30:28 +0900

Published on MDR: 2025-12-13 08:22:20 +0900