Giant anisotropy of the magnetoresistance and the ‘spin valve’ effect in antiferromagnetic Nd2−xCexCuO4

Wu, Tao; Wang, C H; Wu, Gang; Fang, Delong; Luo, Jianlin; Liu, G T; Chen, X H

doi:10.1088/0953-8984/20/27/275226

Cited by 17 publications

(22 citation statements)

References 28 publications

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“…The reorientations were first observed by muon spin resonance and rotation experiments (Luke et al, 1990) and were confirmed later on by crystal-field spectroscopy (Jandl et al, 1999), and more recently by ultrasound propagation experiments (Richard et al, 2005b). The growing competition between the three energy scales leads also to a wide variety of anomalies at low temperature (Cherny et al, 1992;Li et al, 2005a,b;Richard et al, 2005a,b;Wu et al, 2008).…”

Section: Effects Of Rare Earth Ions On Magnetismmentioning

confidence: 89%

Progress and perspectives on electron-doped cuprates

2010

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Although the vast majority of high-Tc cuprate superconductors are hole-doped, a small family of electron-doped compounds exists. Under investigated until recently, there has been tremendous recent progress in their characterization. A consistent view is being reached on a number of formerly contentious issues, such as their order parameter symmetry, phase diagram, and normal state electronic structure. Many other aspects have been revealed exhibiting both their similarities and differences with the hole-doped compounds. This review summarizes the current experimental status of these materials. We attempt to synthesize this information into a consistent view on a number of topics important to both this material class as well as the overall cuprate phenomenology including the phase diagram, the superconducting order parameter symmetry, electron-phonon coupling, phase separation, the nature of the normal state, the role of competing orders, the spin-density wave mean-field description of the normal state, and pseudogap effects.

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Section: Effects Of Rare Earth Ions On Magnetismmentioning

confidence: 89%

Progress and perspectives on electron-doped cuprates

2010

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“…This hysteretic behavior is most likely related to a field-induced reorientation of ordered spins. Indeed, recent reports on the in-plane field rotation [44,45] ordering are present even in the superconducting compound with x = 0.13. Further work is necessary for clarifying the detailed mechanism responsible for coupling the interlayer magnetoresistance to electron spins.…”

Section: Angle-dependent Semiclassical Magnetoresistancementioning

confidence: 99%

Fermi surface of the electron-doped cuprate superconductor Nd_2−xCe_xCuO₄probed by high-field magnetotransport

et al. 2011

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We report on the study of the Fermi surface of the electron-doped cuprate superconductor Nd 2−x Ce x CuO 4 by measuring the interlayer magnetoresistance as a function of the strength and orientation of the applied magnetic field. We performed experiments in both steady and pulsed magnetic fields on high-quality single crystals with Ce concentrations of x = 0.13 to 0.17. In the overdoped regime of x > 0.15 we found both semiclassical angle-dependent magnetoresistance oscillations (AMRO) and Shubnikov-de Haas (SdH) oscillations. The combined AMRO and SdH data clearly show that the appearance of fast SdH oscillations in strongly overdoped samples is caused by magnetic breakdown. This observation provides clear evidence for a reconstructed multiplyconnected Fermi surface up to the very end of the overdoped regime at x 0.17. The strength of the superlattice potential responsible for the reconstructed Fermi surface is found to decrease with increasing doping level and likely vanishes at the same carrier concentration as superconductivity, suggesting a close relation between translational symmetry breaking and superconducting pairing.A detailed analysis of the high-resolution SdH data allowed us to determine the effective cyclotron mass and Dingle temperature, as well as to estimate the magnetic breakdown field in the overdoped regime.

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“…This compound is believed to be more complicated than other parent compound due to the large local moment of Eu 2+ ions. Similar to electron-type N d 2−x Ce x Cu 2 O 4−δ [16,17,18,19,20,21], the interaction between magnetic moments of Fe 2+ and Eu 2+ may lead to rich physical phenomena, and these maybe shed light to the mechanism of superconductivity in these materials. In this paper, we have studied magnetic transition by resistivity, susceptibility and specific heat in Eu 1−x La x Fe 2 As 2 single crystals.…”

mentioning

confidence: 99%

Magnetic phase diagram of single crystals

Chen

et al. 2009

Journal of Magnetism and Magnetic Materials

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We have systematically measured resistivity, susceptibility and specific heat under different magnetic fields (H) in Eu1−xLaxFe2As2 single crystals. It is found that a metamagnetic transition from A-type antiferromagnetism to ferromagnetism occurs at a critical field for magnetic sublattice of Eu 2+ . The jump of specific heat is suppressed and shifts to low temperature with increasing H up to the critical value, then shifts to high temperature with further increasing H. Such behavior supports the metamagnetic transition. Detailed H-T phase diagrams for x=0 and 0.15 crystals are given, and possible magnetic structure is proposed. Magnetoresistance measurements indicate that there exists a strong coupling between local moment of Eu 2+ and charge in Fe-As layer. These results are very significant to understand the underlying physics of FeAs superconductors. The discovery of superconductivity [1, 2,3,4] in ironpnicitides LnF eAsO 1−x F x (Ln=La, Sm, Ce and Pr) has generated much interest for extensive study on such iron-based superconductors, which is the second family of high-T c superconductors except for the high-T c cuprates. The magnetic ordering of the rare earth ions Ln 3+ at low temperature has been observed by neutron scattering [5,6,7] except for the spin density wave arose from F e 2+ . The coupling between Ln 3+ and Fe 2+ has been found above ordering temperature for local moment of rare earth ions Ln 3+ [5]. These results indicate that the coupling between spins of rare earth ions and Fe 2+ ions seems to be one important ingredient to understand magnetic properties at low temperatures. It is well known that spin density wave (SDW) is suppressed, while superconductivity emerges with doping [8,9,10,11,12]. However, no evidence is given for how to couple between SDW and magnetic ordering of rare earth ions Ln 3+ , and effect of magnetic ordering of Ln 3+ on superconductivity. Therefore, the coupling between the SDW from F e 2+ and magnetic ordering of rare earth ions Ln 3+ should be a very interesting issue. It maybe shed light to understand the underlying physics in Fe-As compounds.EuFe 2 As 2 is one of parent compounds with T hCr 2 Si 2 -type structure. It shows a SDW transition around 190 K, and an antiferromagnetic transition of Eu 2+ ions occurs at T N ∼20 K [13]. Superconductivity at ∼ 30 K can be achieved by K or Na doping [14,15]. This compound is believed to be more complicated than other parent compound due to the large local moment of Eu 2+ ions. Similar to electron-type N d 2−x Ce x Cu 2 O 4−δ [16,17,18,19,20,21], the interaction between magnetic moments of Fe 2+ and Eu 2+ may lead to rich physical phenomena, and these maybe shed light to the mechanism of superconductivity in these materials. In this paper, we have studied magnetic transition by resistivity, susceptibility and specific heat in Eu 1−x La x Fe 2 As 2 single crystals. The magnetic structure of Eu 2+ ions is found to be strongly dependent on external magnetic field. A metamagnetic transition from A-type antiferromagnetism to ferro...

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Giant anisotropy of the magnetoresistance and the ‘spin valve’ effect in antiferromagnetic Nd_2−xCe_xCuO₄

Cited by 17 publications

References 28 publications

Progress and perspectives on electron-doped cuprates

Progress and perspectives on electron-doped cuprates

Fermi surface of the electron-doped cuprate superconductor Nd_2−xCe_xCuO₄probed by high-field magnetotransport

Magnetic phase diagram of single crystals

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Giant anisotropy of the magnetoresistance and the ‘spin valve’ effect in antiferromagnetic Nd2−xCexCuO4

Cited by 17 publications

References 28 publications

Progress and perspectives on electron-doped cuprates

Progress and perspectives on electron-doped cuprates

Fermi surface of the electron-doped cuprate superconductor Nd2−xCexCuO4probed by high-field magnetotransport

Magnetic phase diagram of single crystals

Contact Info

Product

Resources

About

Giant anisotropy of the magnetoresistance and the ‘spin valve’ effect in antiferromagnetic Nd_2−xCe_xCuO₄

Fermi surface of the electron-doped cuprate superconductor Nd_2−xCe_xCuO₄probed by high-field magnetotransport