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86 results on '"Whalen, J. B."'

2. Disorder-dependent superconducting phase-diagram at high magnetic fields in Fe$_{1 + y}$Se$_{x}$Te$_{1-x}$ ($x \sim 0.4$)

Author

Gebre, T., Li, G., Whalen, J. B., Conner, B. S., Zhou, H. D., Grissonanche, G., Kostov, M. K., Gurevich, A., Siegrist, T., and Balicas, L.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons
Abstract

We compare the superconducting phase-diagram under high magnetic fields (up to $H = 45$ T) of Fe$_{1+y}$Se$_{0.4}$Te$_{0.6}$ single crystals originally grown by the Bridgman-Stockbarger (BRST) technique, which were annealed to display narrow superconducting transitions and the optimal transition temperature $T_c \gtrsim 14$ K, with the diagram for samples of similar stoichiometry grown by the traveling-solvent floating-zone technique as well as with the phase-diagram reported for crystals grown by a self-flux method. We find that the so-annealed samples tend to display higher ratios $H_{c2}/T_c$, particularly for fields applied along the inter-planar direction, where the upper critical field $H_{c2}(T)$ exhibits a pronounced downward curvature followed by saturation at lower temperatures $T$. This last observation is consistent with previous studies indicating that this system is Pauli limited. An analysis of our $H_{c2}(T)$ data using a multiband theory suggests the emergence of the Farrel-Fulde-Larkin-Ovchnikov state at low temperatures. A detailed structural x-ray analysis, reveals no impurity phases but an appreciable degree of mosaicity in as-grown BRST single-crystals which remains unaffected by the annealing process. Energy-dispersive x-ray analysis showed that the annealed samples have a more homogeneous stoichiometric distribution of both Fe and Se with virtually the same content of interstitial Fe as the non-annealed ones. Thus, we conclude that stoichiometric disorder, in contrast to structural disorder, is detrimental to the superconducting phase diagram of this series under high magnetic fields. Finally, a scaling analysis of the fluctuation conductivity in the superconducting critical regime, suggests that the superconducting fluctuations have a two-dimensional character in this system., Comment: 13 pages, 10 figures, submitted to Physical Review B

Published
2011
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7. Report of activities for the geology and mineral potential of the Chantrey - Thelon area: GEM-2 Thelon tectonic zone project

Author

Berman, R G, primary, Nadeau, L, additional, McMartin, I, additional, McCurdy, M W, additional, Craven, J A, additional, Girard, E, additional, Sanborn-Barrie, M, additional, Carr, S, additional, Pehrsson, S J, additional, Whalen, J B, additional, Davis, W J, additional, Roberts, B J, additional, and Grenier, A, additional

Published
2015
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8. Geo-Mapping Frontiers' Chantrey project: bedrock geology and multidisciplinary supporting data of a 550 kilometre transect across the Thelon tectonic zone, Queen Maud block, and adjacent Rae craton

Author

Berman, R G, primary, Nadeau, L, additional, Percival, J A, additional, Harris, J, additional, Girard, É, additional, Whalen, J B, additional, Davis, W J, additional, Kellett, D, additional, Jefferson, C W, additional, Camacho, A, additional, and Bethune, K, additional

Published
2015
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17. GIS compilation of geology and tectonostratigraphic assemblages, western Uchi Subprovince, western Superior Province, Ontario and Manitoba

Author

Lemkow, D R, primary, Sanborn-Barrie, M, additional, Bailes, A H, additional, Percival, J A, additional, Rogers, N, additional, Skulski, T, additional, Anderson, S D, additional, Tomlinson, K Y, additional, McNicoll, V, additional, Parker, JR, additional, Whalen, J B, additional, Hollings, P, additional, and Young, M, additional

Published
2006
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