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dc.contributor.authorHer, J. L.en_US
dc.contributor.authorKohama, Y.en_US
dc.contributor.authorMatsuda, Y. H.en_US
dc.contributor.authorKindo, K.en_US
dc.contributor.authorYang, W-Hen_US
dc.contributor.authorChareev, D. A.en_US
dc.contributor.authorMitrofanova, E. S.en_US
dc.contributor.authorVolkova, O. S.en_US
dc.contributor.authorVasiliev, A. N.en_US
dc.contributor.authorLin, J-Yen_US
dc.date.accessioned2015-07-21T08:29:29Z-
dc.date.available2015-07-21T08:29:29Z-
dc.date.issued2015-04-01en_US
dc.identifier.issn0953-2048en_US
dc.identifier.urihttp://dx.doi.org/10.1088/0953-2048/28/4/045013en_US
dc.identifier.urihttp://hdl.handle.net/11536/124489-
dc.description.abstractThe electric resistivity of single crystalline Fe-based superconductors FeSe and FeSe0.33Te0.67 was measured in pulsed magnetic fields up to 55 T. Te-doped iron selenide, FeSe0.33Te0.67, shows rather isotropic behavior in both magnetoresistance (MR) and upper critical fields (H-c2(perpendicular to)(0)/H-c2(parallel to)(0) = 48 T/42 T similar to 1.14), when an external magnetic field is applied parallel and perpendicular to the crystallographic c-axis. These isotropic behaviors are frequently observed in an iron-based superconductor, and the isotropy in H-c2 can likely be described by the Pauli effect. In contrast, our measurements elucidate that the undoped iron selenide, FeSe, exhibits a clear anisotropy in both MR and H-c2 (H-c2(perpendicular to)(0)/H-c2(parallel to)(0) = 27 T/15 T similar to 1.8). This behavior occurs because the clean in-plane conduction (RRR = 35) allows to form a closed electron orbit within the two-dimensional Fermi sheets only for the magnetic field parallel to the c-axis, which results in an appearance of an intrinsic (orbital-effect limited) upper critical field for the undoped FeSe. Doping of Te breaks the clean in-plane conduction and leads to a crossover from an orbital limit dominating behavior to a Pauli limit dominating one.en_US
dc.language.isoen_USen_US
dc.subjectsuperconductivity phase diagramsen_US
dc.subjecttransition temperature variationsen_US
dc.subjectphase diagramsen_US
dc.subjectpnictides and chalcogenidesen_US
dc.titleAnisotropy in the upper critical field of FeSe and FeSe0.33Te0.67 single crystalsen_US
dc.typeArticleen_US
dc.identifier.doi10.1088/0953-2048/28/4/045013en_US
dc.identifier.journalSUPERCONDUCTOR SCIENCE & TECHNOLOGYen_US
dc.citation.volume28en_US
dc.contributor.department物理研究所zh_TW
dc.contributor.departmentInstitute of Physicsen_US
dc.identifier.wosnumberWOS:000351055500019en_US
dc.citation.woscount0en_US
Appears in Collections:Articles