Changes in NMR spectra and Knight shifts due to the CDW transition in CuV2S4

Kishimoto, Yutaka; Ohno, Takashi; Kanashiro, Tatsuo; Michihiro, Yoshitaka; Mizuno, Kaoru; Miyamoto, Masahiko; Tanaka, Toshio; Miyatani, Kazuo

doi:10.1016/0038-1098(95)00384-3

Cited by 16 publications

(9 citation statements)

References 14 publications

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“…12 from that reported in [1,3,4,6]. The latter data had a sharp decrease at 90 K. The sin- gle crystal and the fine powders used in the present investigations were grown by Nagata's group, who already reported the important magnetic, electric, and thermal properties of CuV 2 S 4 [7,8,10,11,15,16].…”

Section: (C)supporting

confidence: 51%

“…9. The susceptibility has been reported to be similar at about 3.4 × 10 −6 emu/gOe [6] and 4.0 × 10 −6 emu/gOe [7].…”

Section: Experimental and Resultsmentioning

confidence: 92%

“…After the CDW interpretations of the structural, electric, and magnetic anomalies [1], many investigations were carried out of the structural, magnetic, and electric properties of CuV 2 S 4 in the low-temperature region by means of X-ray diffraction [2][3][4][5], magnetic susceptibility [2,3,[5][6][7], electrical resistivity [2,5,[7][8][9][10], and NMR [4][5][6][11][12][13][14], in addition to the electronic density of states (DOS) [15][16][17]. Lu et al [15] argued using X-ray photoemission and X-ray spectroscopy that Cu ions are in the mono-valent state in Structural and magnetic properties of the spinel CuV 2 S 4 have been studied by means of X-ray diffraction using synchrotron radiation and measurements of magnetic susceptibility.…”

mentioning

confidence: 99%

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Correlation between structural and magnetic properties of half‐metallic spinel CuV₂S₄ due to the order–disorder transition of 3d²(t_2g) orbitals of V³⁺ ions

Kumara

Hidaka²,

Tokiwa

et al. 2008

Physica Status Solidi (b)

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Structural and magnetic properties of the spinel CuV2S4 have been studied by means of X‐ray diffraction using synchrotron radiation and measurements of magnetic susceptibility. The structural phase transitions occur at about 55 K and 90 K, and the superlattice reflections (h ± qo, k ± qo, l) having an orthorhombic reduced wavevector qo = (1/4, 1/4, 0) are observed at 10 K. This suggests that the structure below 55 K is a commensurate unit cell of 4ap × 4bp × cp, where the subscript ‘p’ means a pseudo‐spinel structure, and that the structural phase transitions are induced by the cooperative displacement of S ions in one‐dimensional VS6 octahedral chains, which are aligned along an orthorhombic [110] direction. The susceptibility also shows that the weak ferromagnetic transition occurs at about 90 K, and the spike‐like susceptibility is observed in the region of about 40 K and 55 K. The unusual electronic and magnetic properties of CuV2S4 in the low‐temperature phases below about 90 K are interpreted by order and disorder states of (3dxy, 3dyz, 3dzx) for the V3+ 3d2(t2g) orbitals in the VS6 octahedral chains. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: (C)supporting

confidence: 51%

“…9. The susceptibility has been reported to be similar at about 3.4 × 10 −6 emu/gOe [6] and 4.0 × 10 −6 emu/gOe [7].…”

Section: Experimental and Resultsmentioning

confidence: 92%

mentioning

confidence: 99%

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Correlation between structural and magnetic properties of half‐metallic spinel CuV₂S₄ due to the order–disorder transition of 3d²(t_2g) orbitals of V³⁺ ions

Kumara

Hidaka²,

Tokiwa

et al. 2008

Physica Status Solidi (b)

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“…In contrast, other authors find a cubic to tetragonal structural transition along ½0 0 1 at T ¼ 90 K [4,5].…”

mentioning

confidence: 83%

Electronic transport and structural properties of electronically correlated CuV2S4

Horny

Klimm

Klemm

et al. 2004

Journal of Magnetism and Magnetic Materials

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“…Thus, many experimental and theoretical investigations to clarify the origin of CDW transitions have been carried out. [6][7][8][9][10][11][12][13][14][15][16][17] Photoemission spectroscopy measurements and ab initio band-structure calculations indicated that the Cu ion is close to be monovalent and that the density of states (DOS) at the Fermi level E F is mainly composed of V 3d states. 8,9) Hence, V 3d electrons are responsible for the electrical and magnetic properties of CuV 2 S 4 .…”

Section: Introductionmentioning

confidence: 99%

Structural Properties in Incommensurately Modulated Spinel Compound CuV₂S₄

et al. 2013

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We have studied the incommensurate crystal structure of the spinel compound CuV 2 S 4 at low temperatures using the synchrotron powder diffraction technique. The powder diffraction pattern at 70 K shows that the splitting of the fundamental 800 reflection peak and the weak superlattice reflections with a modulation vector q $ 3=4½110 due to the structural phase transition at 90 K were observed. It is found that the crystal structure at 70 K has an orthorhombic unit cell with the superspace-group Imm2ð00Þ with a modulation vector q ¼ 0:7391ð5Þb Ã . By Rietveld analysis including the incommensurate modulation along the b-axis, large static atomic displacements were found at the positions of V atoms, suggesting that V atoms play an important role in a charge-density wave (CDW) transition. The atomic displacements indicate that V1 atoms at the 4c site form dimers along the a-axis, suggesting that a commensurate CDW forms along the a-axis. Furthermore, the V2 atoms at the 4d site tend to approach V1 dimers, giving rise to the formation of V clusters such as trimers and tetramer-like clusters. The arrangements of V clusters form a pattern along the b-axis with a period of nearly four fundamental cells, which may induce the formation of an incommensurate CDW along the b-axis.

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Changes in NMR spectra and Knight shifts due to the CDW transition in CuV2S4

Cited by 16 publications

References 14 publications

Correlation between structural and magnetic properties of half‐metallic spinel CuV₂S₄ due to the order–disorder transition of 3d²(t_2g) orbitals of V³⁺ ions

Correlation between structural and magnetic properties of half‐metallic spinel CuV₂S₄ due to the order–disorder transition of 3d²(t_2g) orbitals of V³⁺ ions

Electronic transport and structural properties of electronically correlated CuV2S4

Structural Properties in Incommensurately Modulated Spinel Compound CuV₂S₄

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Changes in NMR spectra and Knight shifts due to the CDW transition in CuV2S4

Cited by 16 publications

References 14 publications

Correlation between structural and magnetic properties of half‐metallic spinel CuV2S4 due to the order–disorder transition of 3d2(t2g) orbitals of V3+ ions

Correlation between structural and magnetic properties of half‐metallic spinel CuV2S4 due to the order–disorder transition of 3d2(t2g) orbitals of V3+ ions

Electronic transport and structural properties of electronically correlated CuV2S4

Structural Properties in Incommensurately Modulated Spinel Compound CuV2S4

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Product

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Correlation between structural and magnetic properties of half‐metallic spinel CuV₂S₄ due to the order–disorder transition of 3d²(t_2g) orbitals of V³⁺ ions

Correlation between structural and magnetic properties of half‐metallic spinel CuV₂S₄ due to the order–disorder transition of 3d²(t_2g) orbitals of V³⁺ ions

Structural Properties in Incommensurately Modulated Spinel Compound CuV₂S₄