NMR Investigation of an Itinerant Weakly Antiferromagnetism in Metallic Thiospinels CoCo2S4and (Co1-xCux)Co2S4

Autor:	Hiroshi Sugita, Kazuo Miyatani, Yoshihiro Yamada, Toshiro Tanaka, Shinji Wada
Rok vydání:	1998
Předmět:	Paramagnetism Crystallography Materials science Condensed matter physics Spin echo Spin–lattice relaxation General Physics and Astronomy Antiferromagnetism Knight shift Atmospheric temperature range Néel temperature Magnetic susceptibility
Zdroj:	Journal of the Physical Society of Japan. 67:1401-1408
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsj.67.1401
Popis:	Nuclear magnetic resonance of 59 Co in a metallic thiospinel compound CoCo 2 S 4 was carried out at 75 MHz in a temperature range between 1.4 and 260 K to study the properties of the low frequency spin dynamics at the tetrahedral A and the octahedral B sites. From the combination of the 59 Co Knight shift, spin-lattice relaxation rate and susceptibility measurements, it is concluded that the stoichiometric CoCo 2 S 4 belongs to a group of weakly antiferromagnetic metals with the Neel temperature of ≃55 K. The magnetic properties of Cu substituted compounds (Co 1- x Cu x )Co 2 S 4 were also studied. The results exhibited that the light substitution lowers the Neel temperature and the heavy substitution leads the compound to a nearly Pauli paramagnetic metal.
Databáze:	OpenAIRE
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