Unconventional heavy-fermion superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeCoIn</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml:math>dc magnetization study at temperatures down to 50 mK

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公開日
2002-04-25
権利情報
  • http://link.aps.org/licenses/aps-default-license
DOI
  • 10.1103/physrevb.65.180504
公開者
American Physical Society (APS)

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説明

dc magnetization measurements on ${\mathrm{CeCoIn}}_{5}$ reveal a first-order phase transition at ${H}_{c2}$ for both $H\ensuremath{\Vert}a$ and c axes in the isothermal magnetization $M(H)$ below 0.7 K, indicating a strong Pauli paramagnetic suppression in the even-parity pairing. $M(T)$ in the normal state above ${H}_{c2}$ exhibits non-Fermi-liquid behavior down to 150 mK, implying the existence of antiferromagnetic fluctuations behind the unconventional superconductivity. We observed an unusual peak effect for $H\ensuremath{\Vert}c$ in fields 5--30 kOe below $150 \mathrm{mK}{(=0.06T}_{c}),$ whose anomalous temperature dependence cannot be simply explained by ordinary mechanisms.

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  • Physical Review B

    Physical Review B 65 (18), 180504-, 2002-04-25

    American Physical Society (APS)

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