Low magnetic-field induced high temperature dynamic magnetoelectric coupling performances in Z-type Sr3Co2Fe24O41

2021 ◽  
Author(s):  
Jun Li ◽  
Dongpeng Zhao ◽  
Han Bai ◽  
Zhi Yuan ◽  
Zhongxiang Zhou
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
High Temperature ◽  
Magnetic Moment ◽  
Coupling Coefficient ◽  
Equilibrium Position ◽  
Structural Phase ◽  
Electric Polarization ◽  
Magnetoelectric Coupling ◽  
Low Magnetic Field

Abstract Magnetic-field induced dynamic magnetoelectric coupling effects and polarization performance of Z-type Sr3Co2Fe24O41 (SCFO) ceramic has been investigated. Results found that SCFO’s transverse tapered magnetic structure can induce electric polarization, and its electric polarization direction will not change under external magnetic effects. First-order dynamic magnetoelectric coupling coefficient (α) and second-order dynamic magnetoelectric coupling coefficient (β) of SCFO exhibited strong response main in magnetic structural phase transition region. The magnetoelectric structural phase transition position appeared in low magnetic field, and the magnetic moment vector and its corresponding electric polarization vector of SCFO exhibited the most unstable state near its equilibrium position, which is beneficial for inducing strong dynamic magnetoelectric coupling response. When the applied magnetic fields to SCFO increased, the magnetic moment stability near the equilibrium position increased, and the dynamic magnetoelectric coupling response decreased. Results showed that the dynamic magnetoelectric coupling response of SCFO can bear T1 = 370 K high temperature. The dynamic magnetoelectric coupling response induced by low magnetic fields in SCFO contributes to its actual application in next generation magnetoelectric information storage devices.

Anisotropy in Normal and Superconducting Properties of Single Crystalline (La1−xSrx)2CuO4

1989 ◽  
Vol 156 ◽  
Author(s):  
K. Kitazawa ◽  
S. Kambe ◽  
A. Fukuoka ◽  
M. Naito ◽  
I. Tanaka ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
High Temperature ◽  
Low Temperature ◽  
Conduction Mechanism ◽  
Structural Phase ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Critical Fluctuation ◽  
Structural Region

ABSTRACTTransport measurements were made on single crystals of (La1−xSrx)2CuO4 (x = 0.06 and 0.07) which have sizes large enough so that resistivity could be measured reliably along the c-axis by the usual 4 probe method. It was found that conduction along the c-axis was semiconductive in the low temperature orthorhombic structural region, while it was metallic in the high temperature tetragonal region. The resistivity in the basal plane, however, was not affected by the structural phase transition but could be fitted by the T1.3 dependence over the whole temperature range below 300K. The resistive superconducting transition was found to spread significantly under a magnetic field along the c-axis. But the degree of the spreading was essentially independent of the direction of the measurement current. The results suggest that LSCO is a typical 2D metal but with an unusual conduction mechanism and that its superconducting transition is overwhelmed by critical fluctuation under a magnetic field.

Structural-phase transition in (Cu2Te)2−x(ZnTe)x at high temperature

2021 ◽  
pp. 2150113
Author(s):  
H. B. Gasimov ◽  
R. M. Rzayev
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
High Temperature ◽  
Single Crystals ◽  
Structural Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Xrd Study ◽  
Xrd Method

Cu2Te single crystal was grown by the Bridgman method. X-ray diffraction (XRD) study of Cu2Te single crystals in the temperature range of 293–893 K was performed and possible phase transitions in the mentioned range of temperature have been investigated. (Cu2Te)[Formula: see text](ZnTe)[Formula: see text] single crystals also were grown with [Formula: see text], 0.05, 0.10 concentrations and structural properties of the obtained single crystals were investigated by the XRD method in the temperature range 293–893 K. Lattice parameters and possible phase transitions in the mention temperature range were determined for (Cu2Te)[Formula: see text](ZnTe)[Formula: see text] single crystals for [Formula: see text], 0.05, 0.10 concentrations.

Low magnetic field induced strong magnetoelectric coupling in three phase composite films with ferroelectric domain switchability

2020 ◽  
Vol 46 (10) ◽  
pp. 16598-16604
Author(s):  
Amit Kumar ◽  
Sandeep Saini ◽  
K.L. Yadav ◽  
Mohammad Azam ◽  
Ishtiaq Ahmed ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Composite Films ◽  
Ferroelectric Domain ◽  
Magnetoelectric Coupling ◽  
Three Phase ◽  
Low Magnetic Field

A high temperature structural phase transition in crocoite (PbCrO4) at 1068 K: crystal structure refinement at 1073 K and thermal expansion tensor determination at 1000 K

2000 ◽  
Vol 64 (2) ◽  
pp. 291-300 ◽  
Author(s):  
K. S. Knight
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Thermal Expansion ◽  
High Temperature ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Structure Type ◽  
Temperature Phase ◽  
Thermal Expansion Tensor ◽  
Principal Axes

AbstractHigh-resolution, neutron time-of-flight, powder diffraction data have been collected on natural crocoite between 873 and 1073 K. Thermal analysis carried out in the 1920s had suggested that chemically pure PbCrO4 exhibited two structural phase transitions, at 964 K, to the β phase, and at 1056 K, to the γ phase. In this study, no evidence was found for the α-β structural phase transition, however a high-temperature phase transition was found at ∼1068 K from the ambient-temperature monazite structure type to the baryte structure type. The phase transition, close to the temperatures reported for the β to γ phase modifications, is first order and is accompanied by a change in volume of −1.6%. The crystal structure of this phase has been refined using the Rietveld method to agreement factors of Rp = 0.018, Rwp = 0.019, Rp = 0.011. No evidence for premonitory behaviour was found in the temperature dependence of the monoclinic lattice constants rom 873 K to 1063 K and these have been used to determine the thermal expansion tensor of crocoite just below the phase transition. At 1000 K the magnitudes of the tensor coefficients are α11, 2.66(1) × 10−5 K−1; α22, 2.04(1) × 10−5 K−1; α33, 4.67(4) × 10−5 K−1; and α13, −1.80(2) × 10−5 K−1 using the IRE convention for the orientation of the tensor basis. The orientation of the principal axes of the thermal expansion tensor are very close to those reported previously for the temperature range 50–300 K.

Electronic and Structural Phase Transition Controlled by Photo-excitation and Magnetic Field in Spin Crossover Complex

2002 ◽  
Vol 379 (1) ◽  
pp. 357-364
Author(s):  
Yoshihiro Ogawa ◽  
Shin-Ya Koshihara ◽  
Masaki Takesada ◽  
Tadahiko Ishikawa
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Structural Phase Transition ◽  
Spin Crossover ◽  
Structural Phase
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