Spin-helicity-dependent magnetic domain growth in a spin-driven multiferroic under applied electric field

Nakajima, Tsuyoshi; Mitsuda, Setsuo; Takahashi, Keiichiro; Yamazaki, Hiroe; Yoshitomi, Keisuke; Soda, Minoru; Matsuura, Masato; Hirota, K.

doi:10.1103/physrevb.82.064418

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…In efforts to resolve the mystery of the superconducting mechanism, plenty of experiments have been carried out on the impurity effects in iron-based superconductors. Ways to introduce scattering centers include chemical substitutions [21][22][23][24][25][26][27][28][29][30][31][32][33] and particle irradiations [34][35][36][37][38]. Unfortunately, the conclusions remain highly controversial.…”

Section: Introductionmentioning

confidence: 99%

The effect of impurity and the suppression of superconductivity in Na(Fe_0.97−xCo_0.03T_x)As (T = Cu, Mn)

Deng¹,

Ding²,

Li³

et al. 2014

New J. Phys.

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We report the successful growth of and the effect of impurity scattering in single crystals of Na( − Fe x 0.97 Co 0.03 T x )As (T = Cu, Mn). The temperature dependence of the DC magnetization at high magnetic fields is measured for different concentrations of Cu and Mn. Detailed analysis based on the Curie-Weiss law indicates that Cu doping weakens the average magnetic moments, while doping with Mn enhances the local magnetic moments greatly, suggesting that the former may produce nonmagnetic or very weak magnetic impurities, and that the latter may give rise to magnetic impurities. However, it is found that both doping with Cu and doping with Mn will enhance the residual resistivity and suppress the superconductivity, at similar rates, in the low doping region, which is consistent with the prediction of the S ± model. For the Cu-doped system, the superconductivity is suppressed completely at a residual resistivity of ρ = 0.87 0 mΩ cm, for which a strong localization effect is observed. However, in the case of Mn doping, the suppression of T c becomes much weaker beyond x = 0.03 and superconductivity is maintained even up to a residual resistivity of 2.86 mΩ cm. Clearly the magnetic Mn impurities may even be not as detrimental as the nonmagnetic or very weak magnetic Cu impurities to the superconductivity in the high doping regime.

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Section: Introductionmentioning

confidence: 99%

The effect of impurity and the suppression of superconductivity in Na(Fe_0.97−xCo_0.03T_x)As (T = Cu, Mn)

Deng¹,

Ding²,

Li³

et al. 2014

New J. Phys.

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“…Consequently, only E remains as the practicable external field for driving the helicity DWs. Nevertheless, both the q DWs and the helicity DWs are not driven by E owing to a large coercive electric field above 1 MV/m at the low temperature in this system, even though the nuclei growth of one of the helicity domains at (the first order) ferroelectric transitions can be easily promoted by an applied E. 22 Thus, the reconstruction of helicity domain structures below the ferroelectric phase transition temperature has not been accomplished yet in this system.…”

Section: -17mentioning

confidence: 99%

“…First, what we have controlled is not "the nuclei growth" of one of the helicity domain by applied E on the ferroelectric transition 22 but "the reconstruction" of the helicity domain by driving the helicity DWs, which are not originally driven by only applied E due to the large coercive electric field. Besides providing a new technique of the helicity DW control in CFO systems, the control of the helicity domain in the present study is expected to be realized in other spin-driven ferroelectric materials having a large coercive electric field in a multiferroic phase.…”

Section: E Model Proposalmentioning

confidence: 99%

Activation of frozen ferroelectric domain wall by magnetic field sweeping in multiferroicCuFeO2

et al. 2016

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In a ferroelectric helimagnetic phase of a spin-driven multiferroic CuFeO2, we have found irreversibly additive evolution of electric polarization (P ) induced by sweeping magnetic field (H) under an applied electric field (E), despite a large coercive electric field in the phase. From the unpolarized neutron diffraction experiments with in-situ P measurements under applied E, we have revealed that increment of P is achieved by the variation of an incommensurate magnetic modulation wave number (q) of the helical magnetic ordering in H-sweeping regardless of increasing or decreasing H. Combining this result with H dependence of the magnetic diffraction intensity and a result of off-bench P measurements, we conclude that the H evolution of P is caused by a change in a (ferroelectric) helicity domains volume fraction by driving the helicity domain wall (DW). Taking into account the results of further detailed P measurements, we propose a possible model of the phenomenon that, instead of simply driving the helicity DW, the variation of q causes the neighborhood of the helicity DWs to store an extra exchange energy and to be sensible for E, and then, these regions and the helicity DWs are reconstructed by applied E so as to enlarge the helicity domain favored by the direction of E. The present study demonstrates the magneto-electric cross correlation in driving multiferroic DW: we could activate the frozen ferroelectric DW by means of H-sweeping. This is also an achievement of driving an antiferromagnetic DW, which is difficult in conventional antiferromagnets in principle.

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Single crystal growth of CuFe1−Ga O2 by the optical floating-zone method

Song

Rao

et al. 2016

Journal of Crystal Growth

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Spin-helicity-dependent magnetic domain growth in a spin-driven multiferroic under applied electric field

Cited by 6 publications

References 25 publications

The effect of impurity and the suppression of superconductivity in Na(Fe_0.97−xCo_0.03T_x)As (T = Cu, Mn)

The effect of impurity and the suppression of superconductivity in Na(Fe_0.97−xCo_0.03T_x)As (T = Cu, Mn)

Activation of frozen ferroelectric domain wall by magnetic field sweeping in multiferroicCuFeO2

Single crystal growth of CuFe1−Ga O2 by the optical floating-zone method

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Spin-helicity-dependent magnetic domain growth in a spin-driven multiferroic under applied electric field

Cited by 6 publications

References 25 publications

The effect of impurity and the suppression of superconductivity in Na(Fe0.97−xCo0.03Tx)As (T = Cu, Mn)

The effect of impurity and the suppression of superconductivity in Na(Fe0.97−xCo0.03Tx)As (T = Cu, Mn)

Activation of frozen ferroelectric domain wall by magnetic field sweeping in multiferroicCuFeO2

Single crystal growth of CuFe1−Ga O2 by the optical floating-zone method

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The effect of impurity and the suppression of superconductivity in Na(Fe_0.97−xCo_0.03T_x)As (T = Cu, Mn)

The effect of impurity and the suppression of superconductivity in Na(Fe_0.97−xCo_0.03T_x)As (T = Cu, Mn)