Observation of the spontaneous vortex phase in the weakly ferromagnetic superconductor ErNi$_{2}$B$_{2}$C: A penetration depth study

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dc.creatorChia, Elbert E. M.
dc.creatorSalamon, M. B.
dc.creatorPark, Tuson
dc.creatorKim, Heon-Jung
dc.creatorLee, Sung-Ik
dc.creatorTakeya, Hiroyuki
dc.date2004-09-21
dc.date2005-06-06
dc.date.accessioned2026-07-07T06:26:21Z
dc.date.available2026-07-07T06:26:21Z
dc.descriptionThe coexistence of weak ferromagnetism and superconductivity in ErNi$_{2}$B$% _{2}$C suggests the possibility of a spontaneous vortex phase (SVP) in which vortices appear in the absence of an external field. We report evidence for the long-sought SVP from the in-plane magnetic penetration depth $Δλ(T)$ of high-quality single crystals of ErNi$_{2}$B$_{2}$C. In addition to expected features at the Néel temperature $T_{N}$ = 6.0 K and weak ferromagnetic onset at $T_{WFM}=2.3 $K, $Δλ(T)$ rises to a maximum at $T_{m}=0.45$ K before dropping sharply down to $\sim $0.1 K. We assign the 0.45 K-maximum to the proliferation and freezing of spontaneous vortices. A model proposed by Koshelev and Vinokur explains the increasing $Δλ(T)$ as a consequence of increasing vortex density, and its subsequent decrease below $T_{m}$ as defect pinning suppresses vortex hopping.
dc.description5 pages including figures; added inset to Figure 2; significant revisions to text
dc.identifierhttps://arxiv.org/abs/cond-mat/0409521
dc.identifierhttp://arxiv.org/abs/cond-mat/0409521
dc.identifierEurophys. Lett., 73 (5), pp. 772-778 (2006)
dc.identifierdoi:10.1209/epl/i2005-10465-7
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/97081
dc.subjectSuperconductivity
dc.subjectStatistical Mechanics
dc.titleObservation of the spontaneous vortex phase in the weakly ferromagnetic superconductor ErNi$_{2}$B$_{2}$C: A penetration depth study
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