Field-dependent diamagnetic transition in magnetic superconductor $Sm_{1.85} Ce_{0.15} Cu O_{4-y}$

R. Prozorov; D. D. Lawrie; I. Hetel; P. Fournier; R. W. Giannetta

doi:10.1103/PhysRevLett.93.147001

paper

Field-dependent diamagnetic transition in magnetic superconductor $S m_{1.85} C e_{0.15} C u O_{4 - y}$

arXiv:cond-mat/0406110 · doi:10.1103/PhysRevLett.93.147001

Abstract

The magnetic penetration depth of single crystal $S m_{1.85} C e_{0.15} Cu O_{4 - y}$ was measured down to 0.4 K in dc fields up to 7 kOe. For insulating $S m_{2} Cu O_{4}$ , Sm $^{3 +}$ spins order at the Néel temperature, $T_{N} = 6$ K, independent of the applied field. Superconducting $S m_{1.85} C e_{0.15} Cu O_{4 - y}$ ( $T_{c} \approx 23$ 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.

4 pages, RevTex 4

References in corpus (1)

Quantitative Test of SO(5) Symmetry in the Vortex State of $N d_{1.85} C e_{0.15} C u O_{4}$

Field-dependent diamagnetic transition in magnetic superconductor Sm1.85​Ce0.15​CuO4−y​

Abstract

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Field-dependent diamagnetic transition in magnetic superconductor $S m_{1.85} C e_{0.15} C u O_{4 - y}$