The influence of high magnetic fields on the first order magneto-elastic transition in MnFe(P1−As) systems

Zach, R.; Guillot, M.; Fruchart, R.

doi:10.1016/0304-8853(90)90730-e

Cited by 59 publications

(35 citation statements)

References 7 publications

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“…In the XMCD experiments, the temperatures considered are T C ± 40 K. This temperature range is significantly larger than the purely discontinuous regime at the FOMT and its corresponding magnetic discontinuity. However, one is still in the transition range where short-range order develops [17,18,57,58]. In the paramagnetic phase, the M T (B) curves of the XMCD magnetic moments show in the low magnetic field regime a deviation from Curie-Weiss behavior, indicating the existence of short-range order with temporal fluctuations of ferromagnetically ordered clusters.…”

Section: Resultsmentioning

confidence: 98%

Moment evolution across the ferromagnetic phase transition of giant magnetocaloric(Mn,Fe)2(P,Si,B)
Yibole
¹
,
Guillou
²
,
Caron
³

et al. 2015
Phys. Rev. B
28
3
7
2
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A strong electronic reconstruction resulting in a quenching of the Fe magnetic moments has recently been predicted to be at the origin of the giant magnetocaloric effect displayed by Fe 2 P-based materials. To verify this scenario, x-ray magnetic circular dichroism experiments have been carried out at the L edges of Mn and Fe for two typical compositions of the (Mn,Fe) 2 (P,Si,B) system. The dichroic absorption spectra of Mn and Fe have been measured in the vicinity of the first-order ferromagnetic transition. The experimental spectra are compared with first-principles calculations and charge-transfer multiplet simulations in order to derive the magnetic moments. Even though signatures of a metamagnetic behavior are observed either as a function of the temperature or the magnetic field, the similarity of the Mn and Fe moment evolution suggests that the quenching of the Fe moment is weaker than previously predicted.

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Section: Resultsmentioning

confidence: 98%

Moment evolution across the ferromagnetic phase transition of giant magnetocaloric(Mn,Fe)2(P,Si,B)
Yibole
¹
,
Guillou
²
,
Caron
³

et al. 2015
Phys. Rev. B
28
3
7
2
View full text Add to dashboard Cite

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“…In the paramagnetic state, the magnetic susceptibility deviates from the Curie-Weiss law, up to T * ∼ 630 K. The paramagnetic Curie temperature (θ p ) is estimated to be about 400 K. The deviation of the susceptibility from the Curie-Weiss law is a general feature for hexagonal Fe 2 P-based compounds and is often ascribed to short-range magnetic order. [18][19][20] We suggest that the decrease in the magnetic moments upon heating also contributes to the nonlinear variation of the inverse susceptibility at temperatures below T O . Using the Curie-Weiss law, the effective moment per formula unit (μ eff ) can be derived from the Curie constant (C) by:…”

mentioning

confidence: 82%

High/low-moment phase transition in hexagonal Mn-Fe-P-Si compounds

Dung

Zhang

et al. 2012

Phys. Rev. B

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Using high-resolution neutron diffraction measurements for Mn-rich hexagonal Mn-Fe-P-Si compounds, we show that the substitution of Mn for Fe on the 3f sites results in a linear decrease of the Fe/Mn(3f ) magnetic moments, while the Mn(3g) magnetic moments remain constant. With increasing temperature, the Mn(3g) magnetic moments show almost no change, while the Fe/Mn(3f ) moments decrease quickly when the transition temperature is approached. The reduction of the magnetic moments at the transition temperature and in the high-temperature range is discussed based on changes in interatomic distances and lattice parameters and high-temperature magnetic-susceptibility measurement.

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“…[1][2][3][6][7][8] In Fig. 3, we show the typical results of the X-ray diffraction profiles in 50:5 2 54:0 under a zero field and 5 T at several temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…1,2) In this As concentration, this ordering temperature increases from 200 to 350 K with increasing x.…”

Section: Introductionmentioning

confidence: 83%

Magnetic Field Effect on Structural Property of MnFeP<SUB>0.5</SUB>As<SUB>0.5</SUB>

et al. 2005

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The magnetic field effect on the structural property of a ferromagnetic compound MnFeP 0:5 As 0:5 was investigated by powder X-ray diffraction measurement in magnetic fields up to 5 T. The compound with the hexagonal Fe 2 P-type structure shows a field-induced isostructural transformation with a hysteresis by applying magnetic field, accompanied by the metamagnetic transition from the paramagnetic to ferromagnetic state just above the Curie temperature of 284 K. In this transformation, the a parameter expands by 0.5% whereas the c parameter contracts by 1%. However, the cell volume slightly and continuously decreases with increasing magnetic field through the transformation.

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The influence of high magnetic fields on the first order magneto-elastic transition in MnFe(P1−As) systems

Cited by 59 publications

References 7 publications

Moment evolution across the ferromagnetic phase transition of giant magnetocaloric(Mn,Fe)2(P,Si,B)
Yibole
¹
,
Guillou
²
,
Caron
³

et al. 2015
Phys. Rev. B
28
3
7
2
View full text Add to dashboard Cite

Moment evolution across the ferromagnetic phase transition of giant magnetocaloric(Mn,Fe)2(P,Si,B)
Yibole
¹
,
Guillou
²
,
Caron
³

et al. 2015
Phys. Rev. B
28
3
7
2
View full text Add to dashboard Cite

High/low-moment phase transition in hexagonal Mn-Fe-P-Si compounds

Magnetic Field Effect on Structural Property of MnFeP<SUB>0.5</SUB>As<SUB>0.5</SUB>

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The influence of high magnetic fields on the first order magneto-elastic transition in MnFe(P1−As) systems

Cited by 59 publications

References 7 publications

Moment evolution across the ferromagnetic phase transition of giant magnetocaloric(Mn,Fe)2(P,Si,B)Yibole1, Guillou2, Caron3 et al. 2015Phys. Rev. B28372View full textAdd to dashboardCite

Moment evolution across the ferromagnetic phase transition of giant magnetocaloric(Mn,Fe)2(P,Si,B)Yibole1, Guillou2, Caron3 et al. 2015Phys. Rev. B28372View full textAdd to dashboardCite

High/low-moment phase transition in hexagonal Mn-Fe-P-Si compounds

Magnetic Field Effect on Structural Property of MnFeP<SUB>0.5</SUB>As<SUB>0.5</SUB>

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Moment evolution across the ferromagnetic phase transition of giant magnetocaloric(Mn,Fe)2(P,Si,B)
Yibole
¹
,
Guillou
²
,
Caron
³

et al. 2015
Phys. Rev. B
28
3
7
2
View full text Add to dashboard Cite

Moment evolution across the ferromagnetic phase transition of giant magnetocaloric(Mn,Fe)2(P,Si,B)
Yibole
¹
,
Guillou
²
,
Caron
³

et al. 2015
Phys. Rev. B
28
3
7
2
View full text Add to dashboard Cite