MATERIALS

New compounds discovered by high pressure synthesis


高圧合成法を用いて我々が発見した新物質のコレクションです。

*既知物質と未知物質の固溶系の場合は、ある結晶学的なサイトに占める未知物質の置換元素の割合が5割を超えてはじめて新物質と見なされます。従ってSr0.6Ba0.4CoO3は、既知物質SrCoO3の置換系であり、前述の定義からすると新物質とは言えません。しかしながらこの置換系はSrCoO3とは異なる新奇な磁気秩序相を示すため、物性研究の観点からは”新”物質と見なすことができます。

PrCuO3

Perovskite (Pbnm)

semiconducting/paramagnetic/
quasi-one-dimensional doped quantum-spin chains/
M. Ito et al., Chem. Comm. 55, 8931 (2019)

Sr0.6Ba0.4CoO3

Perovskite (Pm-3m)

metallic/ helimagnetic (TN〜43 K)
/novel helimagnetic state competing with ferromagnetic ordering/
H. Sakai et al., Phys. Rev. Mat. 2, 104412 (2018)

CaCoO3

Perovskite (Pbnm)

metallic/ antiferromagnetic (TN=95 K)
/orbital ordering with nearly metallic behavior, presumably helimagnetic/
T. Osaka et al., Phys. Rev. B 95, 224440 (2017)

SrCo12O19

M-type hexaferrite (P63/mmc)

metal-insulator transition/antiferromagnetic (TN=80 K)/Giant uniaxial negative magnetoresistance/ S. Ishiwata et al., J. Solid State Chem. 181, 1273 (2008)

SrCo6O11

R-type hexaferrite (P63/mmc)

metallic/antiferromagnetic (TN=20 K)/Two-staged negative magnetoresistance caused by frustrated Ising-like spins/ S. Ishiwata et al., Chem. Mater. 17, 2789 (2005)

BiNiO3

Perovskite (P-1)

insulating/antiferromagnetic (TN=300 K)/The first perovskite-type oxide showing A-site charge disproportionation and intersite charge transfer/ S. Ishiwata et al., J. Mater. Chem., 12, 3733 (2002)