NMR study of β-pyrochlore oxide superconductor KOs2 O6

M. Yoshida; K. Arai; R. Kaido; M. Takigawa; S. Yonezawa; Y. Muraoka; Z. Hiroi

doi:10.1016/j.jmmm.2006.10.186

NMR study of β-pyrochlore oxide superconductor KOs₂ O₆

M. Yoshida, K. Arai, R. Kaido, M. Takigawa, S. Yonezawa, Y. Muraoka, Z. Hiroi

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We report results of NMR measurements on the ^{39, 41}K and ¹⁷O nuclei in KOs₂ O₆. We found that the relaxation rate divided by temperature 1 / (T₁ T) at the K sites is strongly enhanced compared with the values expected from the Knight shift and the Korringa relation. By comparing the results at the ³⁹K and ⁴¹K sites, we conclude that the relaxation at the K sites is caused entirely by phonons via the electric quadrupole interaction. Consequently, our results provide information about the dynamics of isolated anharmonic vibration associated with the rattling of K ions.

Original language	English
Pages (from-to)	698-699
Number of pages	2
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 1
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.186
Publication status	Published - Mar 1 2007
Externally published	Yes

Keywords

KOs O
NMR
Rattring
Superconductivity
β-Pyrochlore oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2006.10.186

Cite this

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title = "NMR study of β-pyrochlore oxide superconductor KOs2 O6",

abstract = "We report results of NMR measurements on the 39, 41K and 17O nuclei in KOs2 O6. We found that the relaxation rate divided by temperature 1 / (T1 T) at the K sites is strongly enhanced compared with the values expected from the Knight shift and the Korringa relation. By comparing the results at the 39K and 41K sites, we conclude that the relaxation at the K sites is caused entirely by phonons via the electric quadrupole interaction. Consequently, our results provide information about the dynamics of isolated anharmonic vibration associated with the rattling of K ions.",

keywords = "KOs O, NMR, Rattring, Superconductivity, β-Pyrochlore oxide",

author = "M. Yoshida and K. Arai and R. Kaido and M. Takigawa and S. Yonezawa and Y. Muraoka and Z. Hiroi",

year = "2007",

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T1 - NMR study of β-pyrochlore oxide superconductor KOs2 O6

AU - Yoshida, M.

AU - Arai, K.

AU - Kaido, R.

AU - Takigawa, M.

AU - Yonezawa, S.

AU - Muraoka, Y.

AU - Hiroi, Z.

PY - 2007/3/1

Y1 - 2007/3/1

N2 - We report results of NMR measurements on the 39, 41K and 17O nuclei in KOs2 O6. We found that the relaxation rate divided by temperature 1 / (T1 T) at the K sites is strongly enhanced compared with the values expected from the Knight shift and the Korringa relation. By comparing the results at the 39K and 41K sites, we conclude that the relaxation at the K sites is caused entirely by phonons via the electric quadrupole interaction. Consequently, our results provide information about the dynamics of isolated anharmonic vibration associated with the rattling of K ions.

AB - We report results of NMR measurements on the 39, 41K and 17O nuclei in KOs2 O6. We found that the relaxation rate divided by temperature 1 / (T1 T) at the K sites is strongly enhanced compared with the values expected from the Knight shift and the Korringa relation. By comparing the results at the 39K and 41K sites, we conclude that the relaxation at the K sites is caused entirely by phonons via the electric quadrupole interaction. Consequently, our results provide information about the dynamics of isolated anharmonic vibration associated with the rattling of K ions.

KW - KOs O

KW - NMR

KW - Rattring

KW - Superconductivity

KW - β-Pyrochlore oxide

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