Field-Dependent Diamagnetic Transition in Magnetic SuperconductorSm1.85Ce0.15CuO4−y

2004/06/04 by R. Prozorov, D. D. Lawrie, I. Hetel +2
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.93.147001

published as Phys. Rev. Lett. 93 (14), 147001 (2004) · 4 pages, RevTex 4

arxiv created 2004/06/04 · openalex publication_date 2004/09/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The magnetic penetration depth of single crystal Sm_1.85Ce_0.15CuO_4\ensuremath-y was measured down to 0.4 K in dc fields up to 7 kOe. For insulating Sm₂CuO₄, Sm³⁺ spins order at the N'eel temperature, T_N=6 K, independent of the applied field. Superconducting Sm_1.85Ce_0.15CuO_4\ensuremath-y (T_c\ensuremath≈23 K) shows a sharp increase in diamagnetic screening below T^*(H) which varied from 4.0 K (H=0) to 0.5 K (H=7 kOe) for a field along the c axis. If the field was aligned parallel to the conducting planes, T^* remained unchanged. The unusual field dependence of T^* indicates a spin-freezing transition that dramatically increases the superfluid density.

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