Abstract
The local magnetic field distribution B (r) in the mixed state of a boride superconductor, Y B6, is studied by muon spin rotation (μSR). A comparative analysis using the modified London model and Ginzburg-Landau (GL) model indicates that the latter exhibits a better agreement with μSR data at higher fields and thus demonstrating the importance of reproducing the field profile near the vortex cores when the intervortex distance becomes closer to the GL coherence length. The temperature and field dependence of the magnetic penetration depth (λ) does not exhibit any indications of the nonlocal effect or of low-lying quasiparticle excitation. This suggests that the strong coupling of electrons to the rattling motion of Y ions in the boron cage, as suggested by bulk measurements, induces a conventional superconductivity with isotropic s -wave pairing. Considering the present results, a review is provided for probing the anisotropy of the superconducting order parameters by the slope of λ against the field (η dλ dH).
| Original language | English |
|---|---|
| Article number | 094501 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 76 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 4 2007 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Microscopic properties of vortex states in Y B6 probed by muon spin rotation. / Kadono, R.; Kuroiwa, S.; Akimitsu, Jun; Koda, A.; Ohishi, K.; Higemoto, W.; Otani, S.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 76, No. 9, 094501, 04.09.2007.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Microscopic properties of vortex states in Y B6 probed by muon spin rotation
AU - Kadono, R.
AU - Kuroiwa, S.
AU - Akimitsu, Jun
AU - Koda, A.
AU - Ohishi, K.
AU - Higemoto, W.
AU - Otani, S.
PY - 2007/9/4
Y1 - 2007/9/4
N2 - The local magnetic field distribution B (r) in the mixed state of a boride superconductor, Y B6, is studied by muon spin rotation (μSR). A comparative analysis using the modified London model and Ginzburg-Landau (GL) model indicates that the latter exhibits a better agreement with μSR data at higher fields and thus demonstrating the importance of reproducing the field profile near the vortex cores when the intervortex distance becomes closer to the GL coherence length. The temperature and field dependence of the magnetic penetration depth (λ) does not exhibit any indications of the nonlocal effect or of low-lying quasiparticle excitation. This suggests that the strong coupling of electrons to the rattling motion of Y ions in the boron cage, as suggested by bulk measurements, induces a conventional superconductivity with isotropic s -wave pairing. Considering the present results, a review is provided for probing the anisotropy of the superconducting order parameters by the slope of λ against the field (η dλ dH).
AB - The local magnetic field distribution B (r) in the mixed state of a boride superconductor, Y B6, is studied by muon spin rotation (μSR). A comparative analysis using the modified London model and Ginzburg-Landau (GL) model indicates that the latter exhibits a better agreement with μSR data at higher fields and thus demonstrating the importance of reproducing the field profile near the vortex cores when the intervortex distance becomes closer to the GL coherence length. The temperature and field dependence of the magnetic penetration depth (λ) does not exhibit any indications of the nonlocal effect or of low-lying quasiparticle excitation. This suggests that the strong coupling of electrons to the rattling motion of Y ions in the boron cage, as suggested by bulk measurements, induces a conventional superconductivity with isotropic s -wave pairing. Considering the present results, a review is provided for probing the anisotropy of the superconducting order parameters by the slope of λ against the field (η dλ dH).
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U2 - 10.1103/PhysRevB.76.094501
DO - 10.1103/PhysRevB.76.094501
M3 - Article
AN - SCOPUS:34548440793
VL - 76
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 9
M1 - 094501
ER -