Ferromagnetism vs paramagnetism and false quantum oscillations in lanthanum-doped CaB6

Taichi Terashima, Chieko Terakura, Yuji Umeda, Noriaki Kimura, Haruyoshi Aoki, Satoru Kunii

研究成果: Article査読

52 被引用数 (Scopus)


Magnetization and resistivity were measured as functions of temperature and magnetic field on two single crystals of CaB6 and three of (Ca0.995La0.005)B6. One of the doped crystals exhibited ferromagnetism with the magnetic moment of 0.32 μB/La at 10kOe and 5 K, while the other two were paramagnetic, displaying the Curie law below 120 K with the effective magnetic moment of 1.3 or 2.0 μB/La. We propose that the sample-dependent magnetic behaviors of (Ca0.995La0.005)B6 may be explained in terms of superparamagnetism, assuming that the ferromagnetic state is spatially inhomogeneous. All the samples exhibited the metallic behavior of electrical conduction. Quantum oscillations were found in the magnetoresistance of one of the doped crystals. The angular dependence of the oscillations, however, indicates that their origin is not the sample bulk.

ジャーナルjournal of the physical society of japan
出版ステータスPublished - 2000 8

ASJC Scopus subject areas

  • 物理学および天文学(全般)


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