Peculiar low-temperature properties of metallic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ce</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi

Maiser, E.; Mexner, W.; Schäfer, Roland; Schreiner, T.; Adelmann, P.; Czjzek, G.; Peng, Jie; Greene, R. L.

doi:10.1103/physrevb.56.12961

Cited by 18 publications

(11 citation statements)

References 47 publications

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“…Another scenario [10][11][12] argues that the thermal properties of Nd 2Ϫx Ce x CuO 4 near maximum doping (xϭ0.2) represent a novel type of heavy-fermion behavior. Recent magnetoresistance 13 and SR measurements 14 as well as field dependent specific heat data, 9,13 seem to support the latter interpretation for xу0.14.…”

Section: Introductionmentioning

confidence: 53%

“…Since the existence of Q-independent quasielastic scattering in Nd 1.85 Ce 0.15 CuO 4 is established by inelastic neutron scattering, it supports the interpretation of thermal and transport properties within a novel heavy-fermion picture, [9][10][11][12][13] rather than the conventional spin wave picture. 4,7 In addition, the two bands of magnon modes 1,2 observed in undoped Nd 2 CuO 4 with up to eight branches below 1 meV, seem to be condensed into one strong mode around 0.15 meV, a second much weaker, dispersionless mode at 0.4 meV and a third dispersive mode present between ⌫Z only.…”

Section: Discussionmentioning

confidence: 96%

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Dispersion of Nd spin correlations in heavy-fermion like Nd1.85Ce0.15CuO4

Pyka

Loewenhaupt

Metz

1999

Journal of Applied Physics

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The T′-phase compound Nd2−xCexCuO4 exhibits at T<2 K resemblance with heavy-fermion behavior above a critical Ce content which has been established by specific heat, magnetic susceptibility, magnetoresistance, and μSR experiments and described qualitatively by the Zeeman route to heavy-fermion behavior. We present inelastic neutron scattering measurements at the onset of this doping regime at x=0.15 performed on a single crystal at T=0.05 K. The magnetic response from correlated Nd spins is reminiscent of the spin waves in Nd2CuO4. The dispersion of the Nd–Nd correlations has been determined in several Brillouin zones along the line ΓMAZΓ. Its medium energy is shifted to lower energies by more than 40% compared to the undoped compound. An energy gap of the Nd–Nd correlations is still observed but also an incipient soft mode has been found between the points A and M, which might indicate a magnetic instability. In addition, single-site scattering from slowly relaxing Nd spins contributes to the total magnetic scattering, indicating a hybridization of the Nd-4f electrons with the strongly correlated Cu-3d conduction electrons.

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Section: Introductionmentioning

confidence: 53%

Section: Discussionmentioning

confidence: 96%

Dispersion of Nd spin correlations in heavy-fermion like Nd1.85Ce0.15CuO4

Pyka

Loewenhaupt

Metz

1999

Journal of Applied Physics

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“…A spot of the superconducting phase could result in an additional resistivity decrease, however not the resistivity peak as in those slightly doped samples. Maiser et al 19 have chosen as-grown overdoped NCCO (xϭ0.2) for magnetoresistance studies, since indica- tions for the presence of superconducting regions were found in reduced crystals. Their reduced xϭ0.2 single crystal should be similar to our present sample.…”

Section: Resultsmentioning

confidence: 99%

Low-temperature transport properties ofNd2−xCexCuO
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et al. 2002
Phys. Rev. B
14
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3
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The low-temperature in-plane resistivity and magnetoresistance have been measured for underdoped and overdoped single crystals Nd 2Ϫx Ce x CuO 4ϩ␦ ͑x ϭ 0.14, 0.16, 0.18, and 0.20͒ under magnetic field up to 14 T. We observed a crossover from a metallic to an insulating behavior in the low-temperature normal state for all four samples, which extends the metal-insulator crossover to the overdoped regime. The insulating behavior is marked by a logarithmic temperature dependence of the resistivity, suggesting that a peculiar charge localization is common in all cuprates.

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“…4). This quasi-2-dimensional nature of superconductivity in HTS leads to a pronounced anisotropy of the SC properties with much higher supercurrents along the CuO 2 planes than in 30 In NCCO low-energy excitations are observed for T < 1 K which presumably have their origin in the interaction of the magnetic Nd ions [163,164]. However, this additional physics is not an intrinsic pecularity of electron-doped HTS: GdBa 2 Cu 3 O 7-δ shows similar effects attributed to the magnetic Gd ions [165,166] but the same "high energy" superconducting behavior as other RE-123 HTS.…”

Section: Superconductive Couplingmentioning

confidence: 95%