Magnetic and transport characteristics in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Gd</mml:mi></mml:mrow><mml:mrow><mml:mn>0.925</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.075</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mm

Fujiwara, T.; Fujii, H.; Shigeoka, T.

doi:10.1103/physrevb.63.174440

Cited by 25 publications

(29 citation statements)

References 28 publications

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“…Consequently, a canted magnetic structure develops at temperatures below T C Gd in the presence of an applied field. Fujiwara et al 13 have also reported a canted magnetic structure for RMn 2 X 2 compounds. We feel that this canted structure may be responsible for the unusually large magnetic entropy change at temperatures well below T C Gd , resulting in broad MCE peaks in the compounds with x = 0 and 1.…”

Section: ͑1͒mentioning

confidence: 98%

“…[7][8][9][10] Among the R-TM intermetallics, RMn 2 X 2 ͑X = Si, Ge͒ have attracted a lot of attention due to their interesting magnetic properties. [11][12][13][14] These compounds, in general, crystallize in the tetragonal ThCr 2 Si 2 -type structure. Compounds of this series exist in layered structure with the sequence Mn-X -R -X -Mn, with the layers perpendicular to the c axis.…”

Section: Introductionmentioning

confidence: 99%

“…The compounds such as Gd 5 Si 2 Ge 2 which show field-induced magnetic transitions and/or structural transitions have been found to exhibit giant magnetocaloric effect. 5,6 A few transition metal based compounds also show giant magnetocaloric effect, the representative examples being MnAs and LaFe 13 based systems, which undergo a first order ferromagnetic to paramagnetic transition at their ordering temperature. [7][8][9][10] Among the R-TM intermetallics, RMn 2 X 2 ͑X = Si, Ge͒ have attracted a lot of attention due to their interesting magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ge substitution for Si on the anomalous magnetocaloric and magnetoresistance properties of GdMn2Si2 compounds

Kumar

Singh

Суреш

et al. 2007

Journal of Applied Physics

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The effect of distributed exchange parameters on magnetocaloric refrigeration capacity in amorphous and nanocomposite materials J. Appl. Phys. 111, 07A334 (2012) Particle size dependent hysteresis loss in La0.7Ce0.3Fe11.6Si1.4C0.2 firstorder systems Appl. Phys. Lett. 100, 072403 (2012) Magnetocaloric effect and refrigerant capacity in 0.44, 0.46 The effect of Ge substitution on the magnetization, heat capacity, magnetocaloric effect, and magnetoresistance of GdMn 2 Si 2−x Ge x ͑x = 0, 1, and 2͒ compounds has been studied. The magnetic transition associated with the Gd ordering is found to change from second order to first order on Ge substitution. Magnetic contributions to the total heat capacity and the entropy have been estimated. Magnetocaloric effect has been calculated in terms of adiabatic temperature change ͑⌬T ad ͒ as well as isothermal magnetic entropy change ͑⌬S M ͒ using the heat capacity data. The temperature dependence of the magnetocaloric effect in all the three compounds have shown broad peaks. The maximum values of ⌬S M and ⌬T ad for GdMn 2 Ge 2 are found to be 5.9 J / kg K and 1.2 K, respectively. The magnetoresistance is found to be very large and positive with a maximum value of about 22% in the case of GdMn 2 Ge 2 . In the other two compounds also, the magnetoresistance is predominantly positive, except in the vicinity of the Gd ordering temperature. The anomalous nature of the magnetocaloric effect and the magnetoresistance has been attributed to the canted magnetic structure of these compounds.

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Section: ͑1͒mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Ge substitution for Si on the anomalous magnetocaloric and magnetoresistance properties of GdMn2Si2 compounds

Kumar

Singh

Суреш

et al. 2007

Journal of Applied Physics

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“…This observation is identical to the one reported for polycrystalline Gd 0.975 La 0.025 Mn 2 Si 2 compound. 18 Fujiwara et al 18 have reported the variation of resistivity with temperature, along the c axis ͑ axis ͒ and in the c plane ͑ plane ͒ in single crystals of Gd 0.975 La 0.025 Mn 2 Si 2 . They have shown that the variation of axis obeys T 1.5 behavior, while plane shows a T 1.8 dependence.…”

Section: ͑6͒mentioning

confidence: 99%

“…Some of these compounds exhibit phenomena such as multiple magnetic transitions, first-order transitions, reentrant ferromagnetism, etc. [13][14][15][16][17][18][19] Another important feature of these compounds is the strong dependence of the magnetic properties on the structural parameters. It has been reported that in most of these compounds, the magnetic interaction between adjacent layers of Mn ions, at room temperature, is ferromagnetic if the intralayer Mn-Mn bond length ͑d Mn 18 Since the magnetic ordering of the Mn sublattice is very much dependent on the lattice parameters, the overall magnetic state of these compounds is quite sensitive to temperature, owing to the thermal variation of the lattice parameters.…”

Section: Introductionmentioning

confidence: 99%

Magnetic, magnetothermal, and magnetotransport properties in SmMn2Si2−xGex compounds

Kumar

Суреш

Nigam

et al. 2008

Journal of Applied Physics

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Magnetic properties of isotropic Sm-Fe-N magnets produced by compression shearing method J. Appl. Phys. 111, 07A716 (2012) Stable vortex magnetite nanorings colloid: Micromagnetic simulation and experimental demonstration J. Appl. Phys. 111, 044303 (2012) Evidence for low temperature glassy behavior in La0.5Sr0.5CoO3 J. Appl. Phys. 111, 043902 (2012) Temperature dependent phonon Raman scattering of highly a-axis oriented CoFe2O4 inverse spinel ferromagnetic films grown by pulsed laser deposition Appl. Phys. Lett. 100, 071905 (2012) Additional information on J. Appl. Phys. The effect of Ge substitution for Si in SmMn 2 Si 2−x Ge x compounds has been studied. The Sm ordering temperature is found to be much larger in the compound with x = 2, as compared to the compounds with x = 0 and 1. The increase in the intralayer Mn-Mn distance is attributed to this variation. Among these three compounds, SmMn 2 Ge 2 is found to show reentrant ferromagnetism at low temperatures. The magnetic contribution to the heat capacity has been calculated in all the three compounds. The splitting of the ground state multiplet has been estimated by fitting the magnetic part of the heat capacity data, using the Schottky formula. The isothermal magnetic entropy change is found to remain the same for x = 0 and 1 but decreases in the compound with x = 2, though the nature of magnetic transition changes from second order to first order, as x is increased from 0 to 2. The electrical resistivity increases with Ge concentration. The excess resistivity in the antiferromagnetic region has been calculated.

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Transport properties of Gd1−Y Mn2Ge2

Wada

Kawaguchi

2004

Journal of Alloys and Compounds

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Magnetic and transport characteristics inGd0.925La0.075Mn2

Cited by 25 publications

References 28 publications

Effect of Ge substitution for Si on the anomalous magnetocaloric and magnetoresistance properties of GdMn2Si2 compounds

Effect of Ge substitution for Si on the anomalous magnetocaloric and magnetoresistance properties of GdMn2Si2 compounds

Magnetic, magnetothermal, and magnetotransport properties in SmMn2Si2−xGex compounds

Transport properties of Gd1−Y Mn2Ge2

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