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Exchange field enhanced upper critical field of the superconductivity in compressed antiferromagnetic EuTe2
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Exchange field enhanced upper critical field of the superconductivity in compressed antiferromagnetic EuTe2
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Journal Article
Exchange field enhanced upper critical field of the superconductivity in compressed antiferromagnetic EuTe2
2023
Overview
Understanding the interplay between superconductivity and magnetism has been a longstanding challenge in condensed matter physics. Here we report high pressure studies on the
C
-type antiferromagnetic semiconductor EuTe
2
up to 36.0 GPa. A structural transition from the
I4/mcm
to the
C2/m
space group is identified at ~16 GPa. Superconductivity is observed above ~5 GPa in both structures. In the low-pressure phase, magnetoresistance measurements reveal strong couplings between the local moments of Eu
2+
and the conduction electrons of Te 5
p
orbits. The upper critical field of superconductivity is well above the Pauli limit. While EuTe
2
becomes nonmagnetic in the high-pressure phase and the upper critical field drops below the Pauli limit. Our results demonstrate that the high upper critical field of EuTe
2
in the low-pressure phase is due to the exchange field compensation effect of Eu
2+
and the superconductivity in both structures may arise in the framework of the Bardeen-Cooper-Schrieffer theory.
Understanding the interplay between superconductivity and magnetism has been a longstanding challenge in condensed matter physics. Here, the authors uncover a sensitive coupling between the two within the pressure-tuned phase diagram of EuTe
2
and find that certain magnetic orders can stabilize conventional superconductivity far exceeding the Pauli limit.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Springer Nature,Nature Portfolio
