Fig. 2: Signatures of Pauli limited superconductivity in resistance and flux quantization. | Nature Physics

Fig. 2: Signatures of Pauli limited superconductivity in resistance and flux quantization.

From: Evidence for odd-parity superconductivity underpinned by antiferromagnetism in heavy-fermion metal YbRh2Si2

Fig. 2: Signatures of Pauli limited superconductivity in resistance and flux quantization.The alternative text for this image may have been generated using AI.

a, Quantization of magnetic flux in a loop comprising the YbRh2Si2 sample and conventional superconductors is detected by our SQUID-based transport measurement scheme (Methods). b–d, Parabolic contours with a reproducible HP/Tc0 ratio are observed in all samples, despite strong sample-to-sample variations and arbitrary field orientations in the a–b plane. In samples B and C, the onsets of zero resistance and flux quantization are aligned. By contrast, sample D exhibits a zero-resistance state beyond the Pauli limit. Here the flux quantization is limited by the Pauli limited superconductivity in the contact regions.

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