Physics – Condensed Matter – Superconductivity
Scientific paper
2005-11-17
Physics
Condensed Matter
Superconductivity
5 pages, 5 figures, to be published in Journal of Physical Society of Japan vol. 75, No. 1
Scientific paper
10.1143/JPSJ.75.013708
The Co Knight shift was measured in an aligned powder sample of Na_xCoO_2yH_2O, which shows superconductivity at T_c \sim 4.6 K. The Knight-shift components parallel (K_c) and perpendicular to the c-axis (along the ab plane K_{ab}) were measured in both the normal and superconducting (SC) states. The temperature dependences of K_{ab} and K_c are scaled with the bulk susceptibility, which shows that the microscopic susceptibility deduced from the Knight shift is related to Co-3d spins. In the SC state, the Knight shift shows an anisotropic temperature dependence: K_{ab} decreases below 5 K, whereas K_c does not decrease within experimental accuracy. This result raises the possibility that spin-triplet superconductivity with the spin component of the pairs directed along the c-axis is realized in Na_xCoO_2yH_2O.
Ihara Yutaka
Ishida Keiichi
Itoh Yusuke
Kato Mariko
Michioka Chishiro
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