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Lue, Chin‐Shan; Kuo, Y. K.; Hsu, F. H.; Li, H. H.; Yang, H. D.; Fodor, Petru S.; Wenger, L. E.

doi:10.1103/physrevb.66.033101

Cited by 42 publications

(18 citation statements)

References 15 publications

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“…The mechanism usually used to account for the occurrence of a charge density wave is Fermi surface nesting although other mechanisms have been suggested for different materials all of which are labelled as charge density wave systems [17,18,19]. We note that resistivity versus temperature curves for 'charge ordered' manganites do not show a metal-insulator transition but then neither do many curves for other charge density wave systems (see, for example, Fogle and Perlstein [20], Jiang et al [21], Lue et al [22], Naito and Tanaka [23], Rossnagel et al [24]). …”

Section: Discussionmentioning

confidence: 95%

On the microstructure of the charge density wave observed in La₁₋_xCa_xMnO₃

Loudon¹,

Cox²,

Mathur³

et al. 2005

Philosophical Magazine

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We have used low temperature (90 K) transmission electron microscopy to investigate the 'charge ordering' modulation in the mixed valent manganite, La 1Àx Ca x MnO 3 . It has been stated that Mn 3þ and Mn 4þ ions order at low temperature to produce a structural modulation composed of supercells whose size is an integer multiple of the unmodulated unit cell. Here, we use convergent beam electron diffraction to show that the periodicity of the modulation need not be an integer multiple of the undistorted cell, even on the smallest scales. We therefore suggest that this modulation is a charge density wave with a uniform periodicity. We show that the modulation wavevector lies close to the a* axis of the crystal but need not be exactly collinear. A typical grain of size 0.5 mm in La 0.48 Ca 0.52 MnO 3 had a wavevector which varied on a scale of tens of nanometres with an average of hqi ¼ 0.450a* and a standard deviation Áq ¼ 0.004 a* in its magnitude and Á ¼ 0.56 in its direction at 90 K. The magnitude of the wavevector in this composition fell by 20% as the temperature was increased from 90 K to room temperature. This change occurred by nucleation and growth. Although weak, the modulation was still present at room temperature, some 30 K above the 'charge ordering temperature'.

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Section: Discussionmentioning

confidence: 95%

On the microstructure of the charge density wave observed in La₁₋_xCa_xMnO₃

Loudon¹,

Cox²,

Mathur³

et al. 2005

Philosophical Magazine

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“…6) and CDW systems such as R 5 Ir 4 Si 10 and Lu 5 Rh 4 Si 10 . [33][34][35] Now we discuss possible origins of the peak feature around 19 K, which is considerably lower than T 0 . It is noted that this signature is in great resemblance to that found in URu 2 Si 2 where most of the carriers disappear in the order state, leading to a drastic increase in phononic and electronic mean free paths.…”

Section: Thermal Conductivitymentioning

confidence: 94%

Transport, thermoelectric, and thermal expansion investigations of the cage structure compound CeOs2Al10

et al. 2012

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In order to shed light on the electrical and thermal properties of the cage-type CeOs 2 Al 10 , we investigate this material by measuring electrical resistivity, Seebeck coefficient, thermal conductivity, specific heat, and thermal expansion. The phase transition T 0 ∼ 28 K for CeOs 2 Al 10 has been characterized by marked features in all measured physical quantities. Above T o , the electrical resistivity and Seebeck coefficient can be well described by a two-band model with reliable physical parameters. Furthermore, the extracted magnitude of the quasielastic linewidth q f ∼ 30.2 K is found to be consistent with that observed in the neutron scattering experiment. These results are compared to its isostructural compound CeRu 2 Al 10 .

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“…The rare-earth atoms align along the c-axis and occupy in the three sites with different point symmetry. Specifically, Lu 5 Ir 4 Si 10 and Er 5 Ir 4 Si 10 are established to show CDWtransition accompanied with superconducting or antiferromagnetic ordering [4,18,20,21,23]. Nd 5 Rh 4 Sn 10 shows the first-order antiferromagnetic transition below 6.5 K in the absence of structural transition [17].…”

Section: Introductionmentioning

confidence: 99%