Evidence for an incommensurate charge density wave instability in η-Mo<sub>4</sub>O<sub>11</sub>

Guyot, H.; Schlenker, C.; Pouget, Jean‐Paul; Ayroles, R.; Roucau, C.

doi:10.1088/0022-3719/18/23/007

Cited by 49 publications

(19 citation statements)

References 14 publications

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“…1͑a͒ and 1͑b͒. 10,17 Mössbauer studies, 18 as well as thermal conductivity 19 and optical reflectivity 20 measurements also show anomalies at ϳ100 K which are consistent with a CDW instability. Preliminary x-ray data indicate that the 30 K transition may be related to CDW satellites found at Q II ϭ͑?, 0.42 b*, 0.28 c*͒; 21 this nesting vector is shown in Fig.…”

Section: Introductionmentioning

confidence: 74%

“…10,11,[22][23][24][25][26] The RRR's listed in Table I have been calculated by taking ratios between the resistances at 25 and 4.2 K; this is done to avoid complications associated with the two CDW transitions at ϳ30 and 109 K. Using the same criterion, we can compare RRR's for our samples with those from other published data. In Ref.…”

Section: Resultsmentioning

confidence: 99%

“…We shall see that sample quality has a strong impact on many of the lowtemperature, high-magnetic-field, properties of -Mo 4 O 11 , as has also been noted in a number of other studies. 10,11,[22][23][24][25][26] For this reason, where possible, resistance versus temperature ͑RvT͒ curves were recorded during each sample cool down ͑see Sec. III A͒; in Table I, we list RRR's for most of the samples.…”

Section: Methodsmentioning

confidence: 99%

“…9 These materials have been the subject of considerable interest 10 and their properties are reviewed in Ref. 9.…”

Section: Introductionmentioning

confidence: 99%

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Quantum limit and anomalous field-induced insulating behavior in η-Mo4O11<

Hill

Valfells

Uji³

et al. 1997

Phys. Rev. B

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The quasi-two-dimensional metal -Mo 4 O 11 undergoes two successive charge-density-wave transitions at 109 and 30 K, with corresponding changes in the electronic structure. Measurements of the magnetoresistance, Hall effect, and magnetization, in magnetic fields of up to 50 T and as a function of temperature and pressure, have been performed to determine the ground-state electronic structure. Several distinct quantum oscillations are observed in the low-field magnetoresistance, corresponding to very small closed Fermi surfaces, all of which reach the quantum limit by 20 T. Analysis of the quantum oscillation amplitudes indicate very low carrier effective masses (m*Ͻ0.1m e ) associated with each of the closed two-dimensional Fermi-surface pockets. At higher fields ͑BϾ20 T͒ we see a crossover from ͑semi-͒ metallic to semiconducting behavior, which we associate with a field-induced electron-and hole-band inversion, resulting in a clear gap at the Fermi energy. Measurements of this energy gap allow an independent determination of the carrier effective masses, which are in excellent agreement with the values obtained from the analysis of the low-field ͑BϽ15 T͒ quantum oscillations. We find that the transport and thermodynamic properties of the field-induced insulating state are highly anomalous. In particular, we discuss the Hall effect and the origin of an additional quantum oscillation at high magnetic fields ͑BϾ20 T͒. ͓S0163-1829͑97͒00504-3͔

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Section: Introductionmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…9 These materials have been the subject of considerable interest 10 and their properties are reviewed in Ref. 9.…”

Section: Introductionmentioning

confidence: 99%

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Quantum limit and anomalous field-induced insulating behavior in η-Mo4O11<

Hill

Valfells

Uji³

et al. 1997

Phys. Rev. B

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“…This material undergoes incommensurate CDW transitions at T c1 ഠ 110 K with an incommensurate CDW modulation of q 0.23b ‫ء‬ , and T c2 ഠ 35 K ͓q ͑0.42b ‫ء‬ , 0.28c ‫ء‬ ͔͒. These CDW transitions are observed primarily in transport [19], having only weak structural distortions associated with the transitions [20]. However, the Fermi surface is only partially gapped so that the general trend is that the material continues to become more metallic with decreasing temperature.…”

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confidence: 99%

Phonon Screening in High-Temperature Superconductors

et al. 2000

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In good conductors optical phonons are usually screened, and therefore not observed. However, sharp features due to infrared-active modes in the copper-oxygen planes are observed in the optical conductivity of Pr1.85Ce0.15CuO4 and YBa2Cu3O6.95. Oscillator strengths indicate that the screening of these modes is poor or totally absent. These materials are compared with eta-Mo4O11, in which lattice modes appear suddenly below the charge-density wave transition. It is proposed that poor screening in the cuprates originates from fluctuating charge inhomogeneities in the copper-oxygen planes.

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Effect of Pressure on Electrical Resistivity and Crystal Structure of Quasi‐Two‐Dimensional Mo₄O₁₁

Koyano

Ohara

Negishi

et al. 1988

Physica Status Solidi (b)

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Electrical resistivities p and lattice parameters of quasi-two-dimensional crystals of monoclinic q-Mo,O,, and orthorhombic y-Mo,O,, are measured under hydrostatic pressure up to 1.2 GPa a t room temperature. Both crystals have negative pressure coefficients of e, which can be qualitatively explained by a phonon stiffening effect. In particular, the pressure dependence of p for y-Mo,O,, shows a drastic drop or jump a t Pc = 0.3 GPa, whose magnitude and the pressure coefficients are strongly dependent on the sample resistivity or degree of stoichiometry. It is suggested that the change of a small amount of MOO, tetrahedra into MOO, octahedra induced by excess oxygen atoms is responsible for such structure-sensitive properties.Bei Zimmertemperatur und hydrostatischen Driicken bis zu 1,2 GPa werden die elektrischen Widerstande p und Gitterparameter von quasizweidimensionalen Kristallen von monoklinen qMo40,, und rhombischen y-Mo40,, gemessen. Beide Kristalle haben negative Druckkoeffizienten von p, die qualitativ durch einen Phononenversteifungseffekt erkliirt werden konnen. Insbesondere zeigt die Druckabhangigkeit von e fur y-Mo,O,, einen drastischen Abfall oder Sprung bei P , = = 0,3 GPa, dessen GroDe und die Druckkoeffizienten stark von dem Probenwiderstand oder Grad der Stoichiometrie abhangig sind. Es wird angenommen, daI3 die h d e r u n g eines geringen Anteils von Moo,-Tetraedern in Moo,-Oktaedern, die durch iiberschiissige Sauerstoffatome induziert wird, fiir solche strukturempfindlichen Eigenschaften verantwortlich ist.

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Evidence for an incommensurate charge density wave instability in η-Mo₄O₁₁

Cited by 49 publications

References 14 publications

Quantum limit and anomalous field-induced insulating behavior in η-Mo4O11<

Quantum limit and anomalous field-induced insulating behavior in η-Mo4O11<

Phonon Screening in High-Temperature Superconductors

Effect of Pressure on Electrical Resistivity and Crystal Structure of Quasi‐Two‐Dimensional Mo₄O₁₁

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Evidence for an incommensurate charge density wave instability in η-Mo4O11

Cited by 49 publications

References 14 publications

Quantum limit and anomalous field-induced insulating behavior in η-Mo4O11<

Quantum limit and anomalous field-induced insulating behavior in η-Mo4O11<

Phonon Screening in High-Temperature Superconductors

Effect of Pressure on Electrical Resistivity and Crystal Structure of Quasi‐Two‐Dimensional Mo4O11

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Evidence for an incommensurate charge density wave instability in η-Mo₄O₁₁

Effect of Pressure on Electrical Resistivity and Crystal Structure of Quasi‐Two‐Dimensional Mo₄O₁₁