TY - JOUR
T1 - Magnetic properties of electron-doped LaCoO3
AU - Tomiyasu, Keisuke
AU - Sato, Mika
AU - Koyama, Shun Ichi
AU - Nojima, Tsutomu
AU - Kajimoto, Ryoichi
AU - Ji, Sungdae
AU - Iwasa, Kazuaki
N1 - Funding Information:
Acknowledgments We thank Mr. M. Onodera for assisting in sample preparation and Professor N. Kimura for helping with the SQUID measurements. The neutron experiment at the Materials and Life Science Experimental Facility of J-PARC was performed under the user program (Proposal No. 2012A0144). This study was financially supported by JSPS KAKENHI (JP15H03692) and partly by MEXT KAKENHI (JP17H06137) and FRIS Program for the creation of interdisciplinary research at Tohoku University.
Publisher Copyright:
©2017 The Physical Society of Japan.
PY - 2017/9/15
Y1 - 2017/9/15
N2 - We studied electron-doped LaCo1-yTe6+yO3 by magnetization measurements and neutron scattering. The effective Bohr magneton, estimated by Curie–Weiss fitting around room temperature, is independent of y. This suggests that magnetic Co3+(HS), not nonmagnetic Co3+(LS), is mainly replaced by doped magnetic Co2+(HS). At the lowest temperatures, a Brillouin-function-like saturating behavior persists in the magnetization curves even in the high-y samples, and neither a clear magnetic reflection nor magnetic dispersion is observed by neutron scattering. These findings indicate that the magnetic correlation is very weak, in contrast to the well-known hole-doped LaCoO3 accompanied by a drastic transition to a ferromagnetic metal. However, we also found that the low-y samples exhibit nonnegligible enhancement of the saturated magnetization by ~2μB per a doped electron. All these characteristics are discussed in the light of the activation and inactivation of a spin-state blockade.
AB - We studied electron-doped LaCo1-yTe6+yO3 by magnetization measurements and neutron scattering. The effective Bohr magneton, estimated by Curie–Weiss fitting around room temperature, is independent of y. This suggests that magnetic Co3+(HS), not nonmagnetic Co3+(LS), is mainly replaced by doped magnetic Co2+(HS). At the lowest temperatures, a Brillouin-function-like saturating behavior persists in the magnetization curves even in the high-y samples, and neither a clear magnetic reflection nor magnetic dispersion is observed by neutron scattering. These findings indicate that the magnetic correlation is very weak, in contrast to the well-known hole-doped LaCoO3 accompanied by a drastic transition to a ferromagnetic metal. However, we also found that the low-y samples exhibit nonnegligible enhancement of the saturated magnetization by ~2μB per a doped electron. All these characteristics are discussed in the light of the activation and inactivation of a spin-state blockade.
UR - http://www.scopus.com/inward/record.url?scp=85031039598&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85031039598&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.86.094706
DO - 10.7566/JPSJ.86.094706
M3 - Article
AN - SCOPUS:85031039598
VL - 86
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 9
M1 - 094706
ER -