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Journal Articles

$$mu$$SR measurements on the vortex lattice of CaAlSi; Anisotropic response in magnetic penetration depth

Kuroiwa, Sogo*; Sato, Koki*; Koda, Akihiro*; Kadono, Ryosuke*; Oishi, Kazuki*; Higemoto, Wataru; Akimitsu, Jun*

Journal of Physics and Chemistry of Solids, 68(11), p.2124 - 2128, 2007/11

https://doi.org/10.1016/j.jpcs.2007.08.048
 Times Cited Count：3 Percentile：17.88(Chemistry, Multidisciplinary)

The vortex state defined by two characteristic length scales, magnetic penetration depth ($$lambda$$) and coherence length ($$xi$$), in a layered hexagonal superconductor CaAlSi was probed using muon spin rotation. From preliminary analysis using modified London model, we found that the in-plane $$lambda$$ increases with increasing magnetic field while inter-plane $$lambda$$ is almost independent of magnetic field. The presence of field-induced quasiparticle excitation manifested in the field dependence of $$lambda$$ suggests that CaAlSi has an anisotropic gap structure.

Journal Articles

Microscopic properties of vortex states in YB$$_6$$ probed by muon spin rotation

Kadono, Ryosuke*; Kuroiwa, Sogo*; Akimitsu, Jun*; Koda, Akihiro*; Oishi, Kazuki; Higemoto, Wataru; Otani, Shigeki*

Physical Review B, 76(9), p.094501_1 - 094501_11, 2007/09

https://doi.org/10.1103/PhysRevB.76.094501
 Times Cited Count：11 Percentile：47.11(Materials Science, Multidisciplinary)

Journal Articles

Magnetic field-induced quasiparticle excitation in Nb$$_3$$Sn; Evidence for anisotropic $$s$$-wave pairing

Kadono, Ryosuke*; Sato, Koki*; Koda, Akihiro*; Nagata, Takashi*; Furukawa, Hazuki*; Suzuki, Junichi; Matsuda, Masaaki; Oishi, Kazuki; Higemoto, Wataru; Kuroiwa, Sogo*; et al.

Physical Review B, 74(2), p.024513_1 - 024513_5, 2006/07

https://doi.org/10.1103/PhysRevB.74.024513
 Times Cited Count：10 Percentile：44.47(Materials Science, Multidisciplinary)

The response of vortex state to the magnetic field in Nb$$_3$$Sn is probed using muon spin rotation and small-angle neutron scattering. A transformation of vortex structure between hexagonal and squared lattice is observed over a relatively low field range of 2-3T. The gradual increase of the magnetic penetration depth with increasing field provides microscopic evidence for anisotropic (or multigapped) $$s$$-wave pairing suggested by the Raman scattering experiment. This result renders need for careful examination on the difference of electronic properties between Nb$$_3$$Sn and V$$_3$$Si.

Journal Articles

Magnetic response in the superconducting state of $$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$ studied by $$mu$$SR

Kuroiwa, Sogo*; Takagiwa, Hiroyuki*; Yamazawa, Maki*; Tomita, Yoko*; Akimitsu, Jun*; Oishi, Kazuki; Koda, Akihiro*; Saha, S. R.*; Kadono, Ryosuke*; Higemoto, Wataru

Physica B; Condensed Matter, 374-375, p.251 - 254, 2006/03

https://doi.org/10.1016/j.physb.2005.11.067
 Times Cited Count：1 Percentile：6.64(Physics, Condensed Matter)

Magnetic field dependence of the effective penetration depth ($$lambda$$) determined by $$mu$$SR is reported for $$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$, a structurally new phase of Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$. The new phase has an AlB$$_2$$-type crystal structure with $$P$$3 symmetry which, in contrast to earlier reports, does not exhibit superlattice structure along the $$c$$-axis. The bulk susceptibility measurement indicates that the upper critical field is much lower than that in superstructured ones for both $$c$$- and $$a$$-axis directions. A weak anisotropy in the superconducting order parameter is suggested from the increase of $$lambda$$ with increasing external field.

Journal Articles

Magnetic and superconducting phase diagram in oxybromite cuprate Ca$$_{2-x}$$Na$$_x$$CuO$$_2$$Br$$_2$$

Kuroiwa, Sogo*; Zenitani, Yuji*; Yamazawa, Maki*; Tomita, Yoko*; Akimitsu, Jun*; Oishi, Kazuki; Koda, Akihiro*; Saha, S. R.*; Kadono, Ryosuke*; Watanabe, Isao*; et al.

Physica B; Condensed Matter, 374-375, p.75 - 78, 2006/03

https://doi.org/10.1016/j.physb.2005.11.019
 Times Cited Count：1 Percentile：6.64(Physics, Condensed Matter)

A comprehensive magnetic and superconducting phase diagram determined by muon spin rotation/relaxation ($$mu$$SR) is presented for Ca$$_{2-x}$$Na$$_x$$CuO$$_2$$Br$$_2$$ which has apical bromine atoms. Evidence for antiferromagnetic (AF) order in lightly doped samples and that for quasi-static spin glass (SG)-like state in moderately doped ones are obtained by ZF-$$mu$$SR at low temperatures. While the phase diagram is qualitatively similar to that in typical 2-1-4 cuprates including Ca$$_{2-x}$$Na$$_x$$CuO$$_2$$Cl$$_2$$ and La$$_{2-x}$$Sr$$_x$$CuO$$_4$$, it exhibits a slight shift (expansion) over the $$x$$ axis.

Journal Articles

Possible weak magnetism in MB$$_6$$ (M: Ca, Ba) probed by muon spin relaxation and muon level-crossing resonance

Kuroiwa, Sogo*; Takagiwa, Hiroyuki*; Yamazawa, Maki*; Akimitsu, Jun*; Koda, Akihiro*; Kadono, Ryosuke*; Oishi, Kazuki; Higemoto, Wataru; Watanabe, Isao*

Science and Technology of Advanced Materials, 7(1), p.12 - 16, 2006/01

https://doi.org/10.1016/j.stam.2005.11.012
 Times Cited Count：5 Percentile：22.34(Materials Science, Multidisciplinary)

The temperature dependence of muon spin relaxation rate exhibits a significant increase below $$sim$$130 K in CaB$$_6$$ and $$sim$$110 K in BaB$$_6$$, while no sigh of spontaneous muon precession signal under a zero field is observed. Moreover, the electric field gradient at the boron site measured by muon level-crossing resonance exhibits a step like change at $$sim$$110 K in CaB$$_6$$. These results suggest a change in electronic state and the associated emergence of weak random magnetism below 110-130 K in these alkaline earth hexaborides.

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