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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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