Evidence for spin mixing in holmium thin film and crystal samples

TitleEvidence for spin mixing in holmium thin film and crystal samples
Publication TypeJournal Article
Year of Publication2011
AuthorsUsman ITM, Yates KA, Moore JD, Morrison K, Pecharsky VK, Gschneidner KA, Verhagen T, Aarts J, Zverev VI, Robinson JWA, Witt JDS, Blamire MG, Cohen LF
Journal TitlePhysical Review B
Volume83
Pages144518
Date Published04
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000292147000004
KeywordsAndreev reflection, cro2, field, magnetic structures, metals, polarization, superconductor-ferromagnet structures, supercurrents, transition, triplet
Abstract

In a number of recent experiments, holmium has been shown to promote spin-triplet pairing when in proximity to a spin-singlet superconductor. The condition for the support of spin-triplet pairing is that the ferromagnet should have an inhomogeneous magnetic state at the interface with the superconductor. Here we use Andreev reflection spectroscopy to study the properties of single ferromagnet/superconductor interfaces formed of holmium and niobium, as a function of the contact resistance of the junction between them. We find that both single-crystal and c-axis-oriented thin-film holmium show unusual behavior for low junction contact resistance, characteristic of spin-mixing-type properties, which are thought necessary to underpin spin-triplet formation. We also explore whether this signature is observed when the junction is formed of Ni(0.19)Pd(0.81) and niobium.

DOI10.1103/PhysRevB.83.144518
Alternate JournalPhys. Rev. B