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Transition-Metal Substitutions in Iron Chalcogenides | | V. L. Bezusyy
; D. J. Gawryluk
; A. Malinowski
; Marta Z. Cieplak
; | | Date: |
11 Dec 2014 | | Abstract: | The $ab$-plane resistivity and Hall effect are studied in
Fe$_{1-y}$M$_y$Te$_{0.65}$Se$_{0.35}$ single crystals doped with two transition
metal elements, M = Co or Ni, over a wide doping range, $0 leq y leq 0.2$.
The superconducting transition temperature, $T_{c}$, reaches zero for Co at $y
simeq 0.14$ and for Ni at $y simeq 0.032$, while the resistivity at the
$T_{c}$ onset increases weakly with Co doping, and strongly with Ni doping. The
Hall coefficient $R_H$, positive for $y$ = 0, remains so at high temperatures
for all $y$, while it changes sign to negative at low $T$ for $y > 0.135$ (Co)
and $y > 0.06$ (Ni). The analysis based on a two band model suggests that at
high $T$ residual hole pockets survive the doping, but holes get localized upon
the lowering of $T$, so that the effect of the electron doping on the transport
becomes evident. The suppression of the $T_c$ by Co impurity is related to
electron doping, while in case of the Ni impurity strong electron localization
most likely contributes to fast decrease of the $T_c$. | | Source: | arXiv, 1412.3599 | | Services: | Forum | Review | PDF | Favorites | |
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