Physics – Condensed Matter – Superconductivity
Scientific paper
2007-10-31
Phys. Rev. Lett. 99, 257001 (2007).
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures, to be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.99.257001
A miniature Hall sensor array was used to detect magnetic induction locally in the vortex states of the $\beta$-pyrochlore superconductor KOs$_2$O$_6$. Below the first-order transition at $T_{\rm p}\sim 8$ K, which is associated with a change in the rattling motion of K ions, the lower critical field and the remanent magnetization both show a distinct decrease, suggesting that the electron-phonon coupling is weakened below the transition. At high magnetic fields, the local induction shows an unexpectedly large jump at $T_{\rm p}$ whose sign changes with position inside the sample. Our results demonstrate a novel redistribution of vortices whose energy is reduced abruptly below the first-order transition at $T_{\rm p}$.
der Beek Cornelis J. van
Hiroi Zenji
Konczykowski Marcin
Matsuda Yuichi
Nagao Yohei
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