Abstract:The magnetoelectric effects are investigated in a cubic compound SrCuTe2O6, in which uniform Cu2+ (S = 1/2) spin chains with considerable spin frustration exhibit a concomitant antiferromagnetic transition and dielectric constant peak at TN ≈ 5.5 K. Pyroelectric Jp(T) and magnetoelectric current JME(H) measurements in the presence of a bias electric field are used to reveal that SrCuTe2O6 shows clear variations of Jp(T) across TN at constant magnetic fields. Furthermore, isothermal measurements of JME(H) also … Show more
“…The feature at high T (upturn below 100 K) may arise due to the presence of AFM couplings (short-range correlation above ordering). Similar upturn in the ε′ ( T ) has also been observed in many multiferroic and/or magneto-electric oxides due to magnetic correlations 18–20 . Though, we did not observe any signature of ferroelectricity by pyoelectric measurement within the resolution limit of our instrument.Figure 2χ( T ) measured in 0.5 T. The solid line is a fit to 1/χ data, while the dashed line represents the extrapolation.…”
We report the magnetic and dielectric behavior of Pb6Ni9(TeO6)5, a new compound comprising the honeycomb-like layers of S = 1 spins, through detailed structural, magnetic and dielectric investigation. An antiferromagnetic-type transition at 25 K (T
N) with weak-ferromagnetic behavior is revealed. Interestingly, a large value of coercive field of 1.32 T at 2 K is observed. The isothermal magnetization after zero-field-cooled condition, it exhibits the presence of large spontaneous exchange bias (SEB) with a magnitude of 0.19 T at 2 K; which is rare in single bulk materials, especially without external doping. The value of |H
EB| further enhances to 0.24 T under 16 T field-cooled condition, confirming the presence of large exchange bias in the material.
“…The feature at high T (upturn below 100 K) may arise due to the presence of AFM couplings (short-range correlation above ordering). Similar upturn in the ε′ ( T ) has also been observed in many multiferroic and/or magneto-electric oxides due to magnetic correlations 18–20 . Though, we did not observe any signature of ferroelectricity by pyoelectric measurement within the resolution limit of our instrument.Figure 2χ( T ) measured in 0.5 T. The solid line is a fit to 1/χ data, while the dashed line represents the extrapolation.…”
We report the magnetic and dielectric behavior of Pb6Ni9(TeO6)5, a new compound comprising the honeycomb-like layers of S = 1 spins, through detailed structural, magnetic and dielectric investigation. An antiferromagnetic-type transition at 25 K (T
N) with weak-ferromagnetic behavior is revealed. Interestingly, a large value of coercive field of 1.32 T at 2 K is observed. The isothermal magnetization after zero-field-cooled condition, it exhibits the presence of large spontaneous exchange bias (SEB) with a magnitude of 0.19 T at 2 K; which is rare in single bulk materials, especially without external doping. The value of |H
EB| further enhances to 0.24 T under 16 T field-cooled condition, confirming the presence of large exchange bias in the material.
“…These anomalies reveal nonnegligible frustrated interchain coupling due to the finite J 1 and J 2 [16,17]. In addition, the compound exhibits magnetodielectric coupling at T N1 and T N2 [18] attributed to the non-centro-symmetric nature of the structural symmetry. Furthermore, specific heat, magnetization, and dielectric constant measurements as a function of applied magnetic field reveal a complex phase diagram with an additional field-induced phase [16,17].…”
SrCuTe 2 O 6 consists of a three-dimensional arrangement of spin-1 2 Cu 2+ ions. The first-, second-, and third-neighbor interactions, respectively, couple Cu 2+ moments into a network of isolated triangles, a highly frustrated hyperkagome lattice consisting of corner-sharing triangles and antiferromagnetic chains. Of these, the chain interaction dominates in SrCuTe 2 O 6 while the other two interactions lead to frustrated interchain coupling giving rise to long-range magnetic order at suppressed temperatures. In this paper, we investigate the magnetic properties in SrCuTe 2 O 6 using muon relaxation spectroscopy and neutron diffraction and present the low-temperature magnetic structure as well as the directional-dependent magnetic phase diagram as a function of field.
“…The Jana2006 software were used to perform the Rietveld refinements of the neutron data whereas group theoretical calculation were carried out with the help of the ISODISTORT 15 [33]. This technique has already been applied in several multiferroic studies [34][35][36]. recorded along the a-axis for different poling intervals between 8 K to 2 K with 5.6 kV/cm.…”
Recent progress in the field of multiferroics led to the discovery of many new materials in which ferroelectricity is induced by cycloidal spiral orders. The direction of the electric polarization is typically constrained by spin anisotropies and magnetic field. Here, we report that the mixed rare-earth manganite, , exhibits a spontaneous electric polarization along a general direction in the crystallographic ac plane, which is suppressed below 10 K but re-emerges in an applied magnetic field. Neutron diffraction measurements show that the polarization direction results from a large tilt of the spiral plane with respect to the crystallographic axes and that the suppression of ferroelectricity is caused by the transformation of a cycloidal spiral into a helical onea unique property of this rare-earth manganite. The freedom in the orientation of the spiral plane allows for a fine magnetic control of ferroelectricity, i.e. a rotation as well as a strong enhancement of the polarization depending on the magnetic field direction. We show that this unusual behaviour originates from the coupling between the transition metal and rare-earth magnetic subsystems. orders are often found in frustrated magnets where the electric polarization is induced by unconventional spin orders breaking inversion symmetry of the crystal lattice [7-9]. Frustrated magnetism leads to many competing states and complex phase diagrams. In orthorhombic rareearth (R) manganites RMnO 3 (R = Dy, Tb and Gd), ferroelectricity is associated with the cycloidal spiral ordering of the Mn spins [1, 2, 11, 12]. The electric polarization vector lies in the spiral plane and is perpendicular to the spiral wave vector in accordance with the inverse Dzyaloshinskii-Moriya mechanism and the spin current model of the magnetically-induced ferroelectricity [13-15]. The orientation of the spiral plane depends on the ionic size of R-ion and applied magnetic fields [16]. For example, RMnO 3 with R = Tb and Dy show the cycloidal spiral state with the wave vector along the b-axis and spins parallel to the bc plane which induces a polarization, , in the c-direction [17, 18]. In an applied magnetic field along the b-axis, the polarization vector re-orients from the c-to a-direction due to flop of spiral spins from the bc to the ab plane, in which the magnetic point groups change from mm21' to 2mm1' [11]. GdMnO 3 is close to the borderline separating the nonpolar collinear A-type antiferromagnetic (AFM) state from the polar non-collinear spiral states [11]. Its precise location in the phase diagram remains a controversy and the nature of various competing phases is not well understood. Magnetization and single-crystal synchrotron x-ray data suggest that below 23 K the Mn spins order in the A-
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