Elaboration, structure cristalline et proprietes physiques (transport, susceptibilité magnétique et R.M.N.) du spinelle CuV2S4

Nagard, N. Le; Katty, A.; Collin, G.; Gorochov, O.; Willig, A.

doi:10.1016/0022-4596(79)90167-1

Cited by 36 publications

(10 citation statements)

References 22 publications

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“…4, and the temperature dependence of the shifts of the resonances of 51 V and 63 Cu is plotted in Figure 5. The latter is in good agreement with continuous wave NMR experiments reported previously [5]. The broad spin-echo signals below 90 K in Fig.…”

Section: Resultssupporting

confidence: 92%

Powder Spectra of ⁵¹V NMR in CuV₂S₄: Possible Coexistence of Charge and Spin Density Waves

Nishihara

Todo

Hagino

et al. 1996

Zeitschrift Für Naturforschung A

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NMR experiments are reported for the copper chalcogenide spinel CuV : S 4 , which has incommensurate lattice distortions at low temperatures in spite of the cubic symmetry at high temperature. A broad spin-echo spectrum of 51 V has been observed below 90 K at 17 MHz. but it shows a remarkable frequency dependence where it becomes sharper with decreasing frequency. Possible coexistence of charge and spin density waves is suggested at low temperatures in this material.

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Section: Resultssupporting

confidence: 92%

Powder Spectra of ⁵¹V NMR in CuV₂S₄: Possible Coexistence of Charge and Spin Density Waves

Nishihara

Todo

Hagino

et al. 1996

Zeitschrift Für Naturforschung A

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“…[15][16][17][18][19] Strikingly, copper chalcogenide spinel CuV2S4 superconducts at 4.45-3.20 K and shows three charge density wave (CDW) states (TCDW1 = 55 K, TCDW2 = 75 K, TCDW3 = 90 K). [20][21] It is well known that chemical doping can efficiently tune the crystal and electronic structures of copper chalcogenide spinels, leading to the formation of novel physical properties. For example, the M-I transition was decreased with the increase of Se substitution for S at X-site of CuIr2S4 or Rh substitution for Ir at B-site of CuIr2S4.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in Ru-doped CuIr2Te4 telluride chalcogenide

et al. 2019

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Here we report the effect of structural and superconductivity properties on Ru doped CuIr2Te4 telluride chalcogenide. XRD results suggest that the CuIr2-xRuxTe4 maintain the disordered trigonal structure with space group P3 ̅ m1 (No. 164) for x ≤ 0.3. The lattice constants, a and c, both decrease with increasing Ru content. Temperaturedependent resistivity, magnetic susceptibility and specific-heat measurements are performed to characterize the superconducting properties systematically. Our results suggest that the optimal doping level for superconductivity in CuIr2-xRuxTe4 is x = 0.05,where Tc is 2.79 K with the Sommerfeld constant γ of 11.52 mJ mol -1 K -2 and the specific-heat anomaly at the superconducting transition, C/γTc, is approximately 1.51, which is higher than the BCS value of 1.43, indicating CuIr1.95Ru0.05Te4 is a strongly electron-phonon coupled superconductor. The values of lower {Hc1(0)} and upper {Hc2(0)} critical field calculated from isothermal magnetization {M(H)} and magnetotransport {ρ(T, H)} measurements are 0.98 KOe and 2.47 KOe respectively, signifying that the compound is clearly a type-II superconductor. Finally, a "dome-like" shape superconducting Tcs vs. x content phase diagram is established, where the charge density wave disappears at x = 0.03 while superconducting transition temperature (Tc) rises until it reaches its peak at x = 0.05, then, with decreasing when x reaches 0.3. This feature of the competition between CDW and the superconductivity could be caused by tuning the Fermi surface and density of states with Ru chemical doping.

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“…The symmetry at lower temperature has been controversial; an electron diffraction study has shown orthorhombic symmetry, 2 whereas x-ray diffraction has shown cubic 1 or tetragonal 3 symmetry. The magnetic susceptibility is independent of temperature above 90 K and shows sudden decrease at 90 K. [3][4][5] The linewidth of the 51 V NMR spectrum abruptly increases below 90 K, indicating the existence of the CDW. 6,7 Electrical resistivity shows an anomalous upturn below 90 K. 4,5,8 X-ray photoemission and x-ray emission spectroscopy studies by Lu et al 9 have shown that the Cu ion is in the monovalent state.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic susceptibility is independent of temperature above 90 K and shows sudden decrease at 90 K. [3][4][5] The linewidth of the 51 V NMR spectrum abruptly increases below 90 K, indicating the existence of the CDW. 6,7 Electrical resistivity shows an anomalous upturn below 90 K. 4,5,8 X-ray photoemission and x-ray emission spectroscopy studies by Lu et al 9 have shown that the Cu ion is in the monovalent state. Hence, the Cu 3d electrons hardly contribute to the thermodynamic and transport properties and the V 3d electrons mainly participate in them.…”

Section: Introductionmentioning

confidence: 99%

Photoemission and band-calculation studies of the charge-density wave inCuV2S4

et al. 2001

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We have studied the electronic structure and its changes across the charge-density-wave ͑CDW͒ transition in spinel-type CuV 2 S 4 by photoemission spectroscopy and first-principles band-structure calculations. The photoemission spectra show pseudogap-like behavior and the gap size is estimated to be ϳ90 meV. The large energy scale of the pseudogap compared to the transition temperature and its anomalous temperature dependence implies that the involved interaction is in the strong-coupling regime. The calculated electronic susceptibility (q) shows a small peak at qӍ 11 40 ͓110͔, which is consistent with the observed wave vector q Ӎ 1 4 ͓110͔ characterizing the CDW. This result suggests that Fermi surface nesting is at least partly responsible for the CDW formation.

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Elaboration, structure cristalline et proprietes physiques (transport, susceptibilité magnétique et R.M.N.) du spinelle CuV2S4

Cited by 36 publications

References 22 publications

Powder Spectra of ⁵¹V NMR in CuV₂S₄: Possible Coexistence of Charge and Spin Density Waves

Powder Spectra of ⁵¹V NMR in CuV₂S₄: Possible Coexistence of Charge and Spin Density Waves

Superconductivity in Ru-doped CuIr2Te4 telluride chalcogenide

Photoemission and band-calculation studies of the charge-density wave inCuV2S4

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Elaboration, structure cristalline et proprietes physiques (transport, susceptibilité magnétique et R.M.N.) du spinelle CuV2S4

Cited by 36 publications

References 22 publications

Powder Spectra of 51V NMR in CuV2S4: Possible Coexistence of Charge and Spin Density Waves

Powder Spectra of 51V NMR in CuV2S4: Possible Coexistence of Charge and Spin Density Waves

Superconductivity in Ru-doped CuIr2Te4 telluride chalcogenide

Photoemission and band-calculation studies of the charge-density wave inCuV2S4

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Powder Spectra of ⁵¹V NMR in CuV₂S₄: Possible Coexistence of Charge and Spin Density Waves

Powder Spectra of ⁵¹V NMR in CuV₂S₄: Possible Coexistence of Charge and Spin Density Waves