AI Article Synopsis
- This study investigates the S-N transition of Sr(2)RuO(4), a potential spin-triplet superconductor, using the magnetocaloric effect.
- The findings show that the transition is first order below about 0.8 K and specifically for magnetic fields aligned nearly parallel to the conducting plane, contrasting with the typical second-order transitions in ordinary type-II superconductors.
- An observed entropy release of 10% at 0.2 K across the transition suggests the need for a new mechanism to understand how magnetic fields disrupt superconductivity.
Article Abstract
By means of the magnetocaloric effect, we examine the nature of the superconducting-normal (S-N) transition of Sr(2)RuO(4), a most promising candidate for a spin-triplet superconductor. We provide thermodynamic evidence that the S-N transition of this oxide is of first order below approximately 0.8 K and only for magnetic field directions very close to the conducting plane, in clear contrast to the ordinary type-II superconductors exhibiting second-order S-N transitions. The entropy release across the transition at 0.2 K is 10% of the normal-state entropy. Our result urges an introduction of a new mechanism to break superconductivity by magnetic field.
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| http://dx.doi.org/10.1103/PhysRevLett.110.077003 | DOI Listing |
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