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首页> 外文期刊>Physica status solidi, B. Basic research >Competition and/or coexistence of antiferromagnetism and superconductivity in CeRhIn_5 and CeCoIn_5
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Competition and/or coexistence of antiferromagnetism and superconductivity in CeRhIn_5 and CeCoIn_5

机译:CeRhIn_5和CeCoIn_5中反铁磁和超导的竞争和/或共存

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摘要

The Ce compounds CeCoIn_5 and CeRhIn5 are ideal model systems to study the competition of antiferromagnetism (AF) and superconductivity (SC). Here we discuss the pressure– temperature and magnetic field phase diagrams of both compounds. In CeRhIn5 the interesting observation is that in zero magnetic field a coexistence AFtSC phase exist inside the AF phase below the critical pressure p_c~* ≈ 2 GPa. Above p_c~* AF is suppressed in zero field but can be re-induced by applying a magnetic field. The collapse of AF under pressure coincides with the abrupt change of the Fermi surface. In CeCoIn_5 a new phase appears at low temperatures and high magnetic field (LTHF) which vanishes at the upper critical field Hc2. In both compounds the paramagnetic pair breaking effect dominates at low temperature. We discuss the evolution of the upper critical field under high pressure of both compounds and propose a simple picture of the glue of reentrant magnetism to the upper critical field in order to explain the interplay of antiferromagnetic order and SC.
机译:Ce化合物CeCoIn_5和CeRhIn5是研究反铁磁性(AF)和超导电性(SC)竞争的理想模型系统。在这里,我们讨论两种化合物的压力-温度和磁场相图。在CeRhIn5中,有趣的发现是在零磁场下,在临界压力p_c〜*≈2 GPa以下的AF相内部存在AFtSC相。高于p_c〜*,AF在零磁场中被抑制,但是可以通过施加磁场来重新感应。 AF在压力下的崩溃与费米表面的突变相吻合。在CeCoIn_5中,在低温和高磁场(LTHF)中出现了一个新相,该相在上临界场Hc2处消失了。在这两种化合物中,顺磁性对的断裂作用在低温下均占主导。我们讨论了两种化合物在高压下的上临界场的演变,并提供了一个折返磁场与上临界场的胶水的简单图片,以解释反铁磁序与SC的相互作用。

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