Low-temperature properties of Ga0.5Mo2S4

Шамрай, В. Ф.; Mädge, H.; Mydlarz, T.; Leitus, Gregory

doi:10.1007/bf00681765

Cited by 22 publications

(20 citation statements)

References 8 publications

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“…For example, pressure-induced superconductivity occurs in compounds with 4d and 5d group V elements GaNb 4 S 8 , GaNb 4 Se 8 , and GaTa 4 Se 8 , which reveal the antiferromagnetic correlations at ambient pressure. [2][3][4] In contrast to this, GaMo 4 S 8 is ferromagnetic 5 and does not become superconducting even under a pressure of up to 40 GPa. 6 A key aspect of these systems that distinguishes them from conventional Mott insulators ͑e.g., transition metal oxides͒ is that the "correlated units" are M 4 clusters rather than single ions.…”

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confidence: 88%

Structural and magnetic phase transitions of theV4-cluster compoundGeV4S8

et al. 2008

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The phase transitions of the strongly correlated tetrahedral V 4 -cluster compound GeV 4 S 8 have been studied by low-temperature powder x-ray diffraction, magnetic susceptibility, and specific heat measurements. The crystal structure is cubic at room temperature ͑space group F43m͒ and transforms to orthorhombic ͑space group Imm2͒ at T S = 30 K. A Jahn-Teller distortion reduces the symmetry of the V 4 -cluster from 43m to mm2. The second transition at 18 K is the onset of antiferromagnetic ordering without symmetry change but with a certain increase in the distortion. The latter reflects a strong magnetoelastic coupling at T N . Specific heat anomalies at 30 and 18 K confirm the two phase transitions.

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confidence: 88%

Structural and magnetic phase transitions of theV4-cluster compoundGeV4S8

et al. 2008

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“…The molybdenum Brought to you by | University of California Authenticated Download Date | 6/5/15 8:50 PM atoms were shifted away from the spinel B sites and formed regulär tetrahedral M04 Clusters with metal-metal bonds that were much shorter within the Clusters ([Mo -MoJimra = 2.823 Ä) than between the Clusters ([Mo -Mo]i"," = 4.056 Ä) (Perrin et al, 1975) (for a drawing see Fig. A structural instability was first reported from specific-heat measurements by Shamrai et al (1982), and by Ben Yaich et al (1984), indicating a first-order transition at r, = 46.5 K, i.e. A structural instability was first reported from specific-heat measurements by Shamrai et al (1982), and by Ben Yaich et al (1984), indicating a first-order transition at r, = 46.5 K, i.e.…”

Section: Introductionmentioning

confidence: 98%

Structural phase transition in GaMo4S8 by X-ray powder diffraction

François¹,

Lengauer²,

Yvon³

et al. 1991

Zeitschrift Für Kristallographie - Crystalline Materials

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GaMo4S8 transforms at T, = 45(5) K from a cubic high-temperature modification with ordered defect spinel structure (space group F43m, a = 9.7356(2) Ä at 300 K) to a rhombohedrally distorted low-temperature modification {R3m, = 6.8506(2) Ä, a^h = 60.533(1)° at 8 K). The transition is of first Order, shows a hysteresis of about 4 K, and leaves about 30% of the cubic phase untransformed. Lattice parameters as a function of temperature are reported between 8 K and 300 K, and structure refinements are performed by the Rietveld method from data recorded on a Guinier diffractometer at 8 K and 300 K. The tetrahedral M04 Clusters expand during the phase transjtion at one of their triangular bases, [Mo -MoL = 2.814(3) Ä at r=300K; 2.89(1) Ä at T=SK, while the other intra-cluster distances, [Mo-Moj] = 2.814(3) Ä at 7= 300 K; 2.81(2) Ä at r = 8 K, and inter-cluster distances, [M04-M04] = 4.070(3) Ä at 7 = 300 K; 4.02-4.04(2) Ä at r = 8 K, remain approximately constant.' Permanent address:

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“…This indicates that the Curie-Weiss behavior is due to band structure effects rather than localized spins [36]. [34], where the overlap of 4d orbitals results in the electrons being considered as itinerant [34,35,37]. The combination of the valence state (Fig.…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Multiple superconducting states induced by pressure inMo3Sb7

et al. 2017

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Abstract:Tuning competing ordering mechanisms with hydrostatic pressure in the 4d intermetallic compound Mo 3 Sb 7 reveals an intricate interplay of structure, magnetism, and superconductivity. Synchrotron x-ray diffraction and magnetic susceptibility measurements, both employing diamond anvil cell technologies, link a first-order structural phase transition to a doubling of the superconducting transition temperature. In contrast to the spin-dimer picture for Mo 3 Sb 7 , we deduce from x-ray absorption near edge structure and dc magnetization measurements at ambient pressure that Mo 3 Sb 7 should only possess very small, itinerant magnetic moments. The pressure evolution of the superconducting transition temperature strongly suggests its enhancement due to a difference in the phonon density-of-states with changed crystal symmetry.2

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Low-temperature properties of Ga0.5Mo2S4

Cited by 22 publications

References 8 publications

Structural and magnetic phase transitions of theV4-cluster compoundGeV4S8

Structural and magnetic phase transitions of theV4-cluster compoundGeV4S8

Structural phase transition in GaMo4S8 by X-ray powder diffraction

Multiple superconducting states induced by pressure inMo3Sb7

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