Charge-density-wave related quantum transport in monoclinic η-Mo4O11 crystal

Koyano, Mikio; Ohara, Shuichi; Horisaka, S.; Negishi, H.; Inoue, M.; Takeyama, S.; Miura, N.

doi:10.1016/0038-1098(89)91021-1

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…As noted above, Shubnikov-de Haas oscillations are not clearly seen because of a smoothing procedure for noise reduction, even though detailed measurements did show them, as already reported. [5][6][7][8][9] Once the sweep range exceeds H c , a hysteresis appears in these curves, as marked by arrows, where the values of both components for the up sweep is always lower than those for the down sweep, a behavior similar to the dc data reported. [5][6][7][8][9] We note that the values of both Re ⌬ and Imp ⌬ decrease appreciably with increasing frequency.…”

Section: Methodssupporting

confidence: 65%

“…3 Stationary and pulsed high-magnetic-field experiments have shown that the dc transverse magnetoresistance and Hall effect exhibit a characteristic hysteresis for a field sweep beyond a threshold value H c ͑Х10 T͒, that the observed magnetoresistance ⌬/ 0 at 4.2 K attains unusually high values as high as 100 at, say 40 T, and that the Hall resistivity H has a unique magnetic-field dependence showing a maximum near H c and a decrease at high fields. [6][7][8][9] The observed magnetic-field dependence of the dc magnetoresistance and Hall resistivity, together with their hysteresis effects, have been simulated to some extent using the above multicarrier model. 8 The Hall resistivity shows a sign reversal from positive to negative at high magnetic fields and is found to continue to decrease with increasing magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic-field-induced phase transition and sliding motion of charge-density waves in η-Mo4O11
Sasaki
¹
,
Hara
²
,
Inoue
³

et al. 1997
Phys. Rev. B
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Transverse magnetoresistance and Hall effect of the charge-density-wave ͑CDW͒ material -Mo 4 O 11 have been measured at 4.2 K ͑second CDW state͒ by dc and ac methods over the frequency range 50-500 kHz in pulsed magnetic fields up to 40 T. These quantities are both reversible and frequency independent for a low-field sweep up to near 10 T ͑ϭH c ͒, beyond which an appreciable frequency-dependent hysteresis effect appears. The Cole-Cole plots of the real versus imaginary parts of the magnetoresistance at high magnetic fields show a monodispersion. The magnetic-field dependence of the real part of the ac Hall resistivity shows interesting behaviors, peaking near H c , followed by a decrease with H and a leveling off at high fields, while the imaginary components are very small and less frequency dependent. Using a multicarrier model consisting of the remaining and nested electron and hole bands, we have performed computer simulations for these dc and ac magnetotransport quantities, in satisfactory agreement with the observations. We have taken into account ͑1͒ the Zeeman effect for two types of the remaining hole and electron bands, ͑2͒ the CDW-gap narrowing of the nested electron and hole bands, ͑3͒ magnetic-field-induced CDW-to-normal phase transition in part of these nested bands, and ͑4͒ the magnetic-field-induced ''CDW oscillation'' around some mean position of the CDW condensates ͑or thermal excitation of the CDW phasons over a pinning potential͒, according to the existing CDW model.

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Section: Methodssupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Magnetic-field-induced phase transition and sliding motion of charge-density waves in η-Mo4O11
Sasaki
¹
,
Hara
²
,
Inoue
³

et al. 1997
Phys. Rev. B
Self Cite
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AC Conduction of Charge Density Waves in η‐Mo₄O₁₁ with Quasi‐Two‐Dimensional Structure

Koyano

Inoue

Hughes

et al. 1992

Physica Status Solidi (b)

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The real and imaginary components of the resistive voltage (2,) and Hall voltage (2,) impedances of a quasi-two-dimensional q-Mo,O, crystal are measured over the temperature range 4.2 to 300 K and frequency range 100 Hz to 100 kHz under magnetic fields up to 4.6 T. The resistive impedance shows an appreciable ac response of electrical conduction due to an oscillating charge density wave (CDW) condensate below the first CDW transition temperature TI (= 105 K), and below the second CDW transition temperature K 2 ( = 35 K) Shubnikov-de Haas oscillations due to free conduction carriers that locate on the remaining Fermi surfaces produced by the CDW transitions. A qualitative discussion is given for these dynamic properties.Die Real-und Imaginarkomponenten der Impedanzen der Widerstandsspannung (Z,) und Hallspannung (2,) eines quasi-zweidimensionalen q-Mo40, ,-Kristalls werden im Temperaturbereich 4,2 bis 300K und Frequenzbereich 100Hz bis 100kHz und Magnetfeldern bis zu 4,6T gemessen. Die Widerstandsimpedanz zeigt eine betrachtliche elektrische Wechselspannungsleitfahigkeit infolge eines oszillierenden Ladungsdichtewellen (LDW)-Kondensats unterhalb der ersten LDW-Ubergangstemperatur T,, (= 105 K) und unterhalb der zweiten LDW-Ubergangstemperatu: Tc2 (=35 K) Shubnikov-de Haas-Schwingungen infolge freier Ladungstriiger, die nach den LDW-Ubergangen auf der verbleibenden Fermiflache lokalisiert sind. Diese dynamischen Eigenschaften werden diskutiert.

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Anomalous Galvanomagnetic Properties of Quasi‐Two‐Dimensional η‐Mo₄O₁₁ Crystal under High Magnetic Fields

Inoue

Machel

Laue

et al. 1992

Physica Status Solidi (b)

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Transverse magnetoresistance and Hall effect of the quasi-two-dimensional crystal of q-Mo,O, that undergoes twice in the charge density wave (CDW) transitions at T,, = 105 and Tc2 = 35 K, are measured in liquid He temperature ranges using a pulse magnet up to 33 T and a Bitter-type magnet up to 17 T. In the CDW state below T,, there appear hysteresis phenomena in the magnetic field dependences of both quantities when a field sweep range exceeds a threshold value of about 10 T, and the Hall voltage has a unique magnetic field dependence. Computer simulations for these unique transport quantities are made using a possible band scheme consisting of multiple conduction carriers (electrons and holes). IntroductionThe monoclinic crystal of q-Mo,O,, is a unique material, whose crystal structure is quasi-two-dimensional and thus their Fermi surfaces are strongly anisotropic with elongated shapes along the a* axis [l]. Of particular interest is that it undergoes twice the so-called Peierls transitions at the characteristic temperatures T,, = 105 und T,, = 35 K associated with charge density wave (CDW) instabilities with the nesting vector q = 0.23b* along the b* axis. Experimentally anomalous behaviors have been found at T,, and T,, in the temperature dependences of various transport properties, such as electrical resistivity, Hall coefficient, and thermoelectric power [2 to 51. In this material system, both electrons and holes contribute to these conduction phenomena. Recent band calculations for this material ') MendelssohnstraBe 3, W-3300 Braunschweig, FRG. 2, Kagamiyama 1-3-1, Higashi-Hiroshima 724, Japan. ') On leave of absence from Department of Materials Science.

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Charge-density-wave related quantum transport in monoclinic η-Mo4O11 crystal

Cited by 6 publications

References 9 publications

Magnetic-field-induced phase transition and sliding motion of charge-density waves in η-Mo4O11
Sasaki
¹
,
Hara
²
,
Inoue
³

et al. 1997
Phys. Rev. B
Self Cite
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Magnetic-field-induced phase transition and sliding motion of charge-density waves in η-Mo4O11
Sasaki
¹
,
Hara
²
,
Inoue
³

et al. 1997
Phys. Rev. B
Self Cite
11
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0
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AC Conduction of Charge Density Waves in η‐Mo₄O₁₁ with Quasi‐Two‐Dimensional Structure

Anomalous Galvanomagnetic Properties of Quasi‐Two‐Dimensional η‐Mo₄O₁₁ Crystal under High Magnetic Fields

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Charge-density-wave related quantum transport in monoclinic η-Mo4O11 crystal

Cited by 6 publications

References 9 publications

Magnetic-field-induced phase transition and sliding motion of charge-density waves in η-Mo4O11Sasaki1, Hara2, Inoue3 et al. 1997Phys. Rev. BSelf Cite11000View full textAdd to dashboardCite

Magnetic-field-induced phase transition and sliding motion of charge-density waves in η-Mo4O11Sasaki1, Hara2, Inoue3 et al. 1997Phys. Rev. BSelf Cite11000View full textAdd to dashboardCite

AC Conduction of Charge Density Waves in η‐Mo4O11 with Quasi‐Two‐Dimensional Structure

Anomalous Galvanomagnetic Properties of Quasi‐Two‐Dimensional η‐Mo4O11 Crystal under High Magnetic Fields

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Magnetic-field-induced phase transition and sliding motion of charge-density waves in η-Mo4O11
Sasaki
¹
,
Hara
²
,
Inoue
³

et al. 1997
Phys. Rev. B
Self Cite
11
0
0
0
View full text Add to dashboard Cite

Magnetic-field-induced phase transition and sliding motion of charge-density waves in η-Mo4O11
Sasaki
¹
,
Hara
²
,
Inoue
³

et al. 1997
Phys. Rev. B
Self Cite
11
0
0
0
View full text Add to dashboard Cite

AC Conduction of Charge Density Waves in η‐Mo₄O₁₁ with Quasi‐Two‐Dimensional Structure

Anomalous Galvanomagnetic Properties of Quasi‐Two‐Dimensional η‐Mo₄O₁₁ Crystal under High Magnetic Fields