Antiferroquadrupolar Ordering and Magnetic Properties of the Tetragonal DyB2C2Compound

Yamauchi, Hiroki; Onodera, Hidetoshi; Ohoyama, Kenji; Onimaru, Takahiro; Kosaka, Masashi; Ohashi, Masayoshi; Yamaguchi, Yasuo

doi:10.1143/jpsj.68.2057

Cited by 164 publications

(168 citation statements)

References 29 publications

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“…On the basis of speci®c heat, magnetization and neutron diffraction measurements on a single crystal, Yamauchi et al (1999) proposed that an AFQ con®guration exists between T Q = 24.7 K and T C = 15.3 K, below which there is long-range magnetic order. A plausible model of features that set in at T Q involves two almost degenerate Kramers conjugate Dy states well separated in energy from the other 12 crystal-®eld states created from 6 H 15/2 .…”

Section: Example: Dysprosium Borocarbidementioning

confidence: 99%

X-ray birefringence and dichroism obtained from magnetic materials

Lovesey¹,

Collins²

2001

J Synchrotron Radiat

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In the past decade, synchrotron radiation has triggered a surge in studies of the polarization dependence of X-ray beams passing through non-isotropic materials. A vast range of experimental results concerning polarization-dependent absorption (dichroism) and dispersion (birefringence, for example) are available from materials which are either magnetic or exhibit preferred directions due to the local atomic environment. This article aims to bring together the diversity of modern experiments in this ®eld with established methods of optical calculus, in a way that highlights the simplicity of the underlying physics. A useful framework is formed when observable quantities, in the X-ray case, are related to atomic variables of the sample material. Atomic descriptions of absorption spectra with various levels of complexity are considered, and some well documented sum-rules are encountered. The framework is the most general allowed within the electric dipole approximation. By way of illustration, dichroic X-ray absorption by two materials with highly anisotropic properties and magnetic ions with different valence shells are considered; namely, a 3d-transition ion in ferrous niobate, and a lanthanide ion in dysprosium borocarbide. Both materials display interesting magnetic properties that are challenging to interpret at an atomic level of detail, and it is shown how absorption experiments can contribute to resolving some issues.

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Section: Example: Dysprosium Borocarbidementioning

confidence: 99%

X-ray birefringence and dichroism obtained from magnetic materials

Lovesey¹,

Collins²

2001

J Synchrotron Radiat

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“…The existence of the strong antiferroquadrupolar (AFQ) interaction is a characteristic feature in the tetragonal RB 2 C 2 (R ¼ rare earth) compounds. DyB 2 C 2 shows an AFQ ordering at T Q ¼ 24:7 K above an antiferromagnetic (AFM) transition at T N ¼ 15:3 K [1]. An AFQ order in HoB 2 C 2 coexists with an AFM order below T Q ¼ 4:5 K [2].…”

mentioning

confidence: 98%

Unusual antiferromagnetic properties affected by antiferroquadrupolar interaction in TbB2C2

Kaneko

Metoki

Ohoyama

et al. 2004

Journal of Magnetism and Magnetic Materials

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“…The tetragonal RB 2 C 2 (R=rare earth) compounds show characteristic and diversified magnetic properties due to competition between antiferroquadrupolar (AFQ) and antiferromagnetic (AFM) interactions [1][2][3]. Of this system, we make much account of the long periodic magnetic states in RB 2 C 2 (R=Ho, Tb and Er), because the periodicities in the c-plane are nearly the same [2][3][4][5].…”

mentioning

confidence: 99%