Magnetic resonance studies in ferromagnetic REMn<sub>2</sub>X<sub>2</sub>(RE=rare earth, X=Si, Ge) materials

Sampathkumaran, E. V.; Gupta, LC; Vijayaraghavan, R.; Khoï, Le Dang; Veillet, P.

doi:10.1088/0305-4608/12/5/020

Cited by 23 publications

(5 citation statements)

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“…5 The exchange interactions can be mediated by two different modes: (1) The indirect exchange that occurs between two Mn planes through the conduction electron polarization process and (2) the super exchange mediated through the Mn-Si(Ge)-Si(Ge)-Mn chain. 6 To characterize the antiferromagnetic ordering with accuracy, 57 Fe Mossbauer study was carried out and showed that the Mn sublattice probably is antiferromagnetically ordered up to 470 K and 415 K, respectively, for LaMn 2 Si 2 and LaMn 2 Ge 2 . 2 In the present work, the magnetic behavior of these compounds, when Si is gradually replaced by Ge, was investigated by measuring the magnetic hyperfine field (B hf ) at Mn sites with perturbed c À c angular correlation (PAC) spectroscopy using 111 In( 111 Cd) as probe nuclei.…”

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confidence: 99%

Magnetic behavior of LaMn2(Si(1−x)Gex)2 compounds characterized by magnetic hyperfine field measurements

Bosch-Santos

Carbonari

Cabrera-Pasca

et al. 2014

Journal of Applied Physics

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Magnetic behavior of LaMn2(Si(1−x)Gex)2 compounds characterized by magnetic hyperfine field measurements

Bosch-Santos

Carbonari

Cabrera-Pasca

et al. 2014

Journal of Applied Physics

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“…The layered compounds RMn 2 Ge 2 (Rϭrare earth͒, known to crystallize in the ThCr 2 Si 2 -type tetragonal crystal structure, are of considerable interest [1][2][3][4] as the nature of magnetic ordering of the Mn sublattice depends sensitively on the planar Mn-Mn distance (d). Thus for R alloys in which the value of d exceeds 2.87 Å , ferromagnetism is observed and for dϽ2.87 Å antiferromagnetism prevails.…”

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Magnetoresistance anomalies and multiple magnetic transitions in SmMn2Ge2<

1996

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The results of magnetoresistance (⌬/), heat capacity (C), and ac susceptibility () measurements are reported for a polycrystalline specimen of SmMn 2 Ge 2 . In addition to sharp variations of the order of 3-5 % at 110 and 142 K, there are anomalies in the sign and the magnitudes of ⌬/ . A finding of considerable interest is that there is a gradual increase of ⌬/ from a small negative value at 35 K to a very large value of about 24% at 4.2 K in the presence of a magnetic field of 80 kOe, though apparently there is no corresponding anomaly in the C data. This finding signals the existence of a phase transition below 30 K attributable to magnetic ordering from Sm sublattice, thereby making the origin of the onset of Mn ordering around 110 K a puzzle. ͓S0163-1829͑96͒50530-8͔

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“…These two probe approach is very important when investigating the magnetic behavior of compounds that present different types of exchange interactions, such as inter-layer exchange interaction Mn-Mn and intra-layer interactions through indirect exchange that occurs between two Mn planes mediated by conduction electron polarization. 9,10 ACKNOWLEDGMENTS Partial financial support for this research was provided by Fapesp. B.B.S., A.W.C., R.S.F., and R.N.S.…”

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confidence: 99%

The magnetic behavior of the intermetallic compound NdMn2Ge2 studied by magnetization and hyperfine interactions measurements

Bosch-Santos

Carbonari

Cabrera-Pasca

et al. 2015

Journal of Applied Physics

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The magnetic behavior of the intermetallic compound NdMn 2 Ge 2 was investigated by bulk magnetization measurements and measurements of hyperfine interactions using perturbed c-c angular correlation (PAC) spectroscopy. Magnetization measurements indicate the presence of four magnetic transitions associated with the Mn and Nd magnetic sublattices. At high temperatures, magnetic measurements show a change in the slope of the magnetization due to an antiferromagnetic transition around T N $ 425 K and a well defined ferromagnetic transition at T C $ 320 K. Moreover, at $210 K a peak is observed in the magnetization curve, which is assigned to the reorientation of the Mn spin, and at $25 K an increase in the magnetic moment is also observed, which is ascribed to the ordering of Nd ions. PAC measurements using 140 La( 140 Ce) and 111 In( 111 Cd) probe nuclei allowed the determination of the temperature dependence of the magnetic hyperfine field (B hf ) at Nd and Mn sites, respectively. PAC results with 111 Cd probe nuclei at Mn sites show that the dependence of B hf with temperature follows the expected behavior for the host magnetization associated with the magnetic ordering of Mn ions. From these results, the antiferromagnetic transition followed by a ferromagnetic ordering is clearly observed. PAC results with 140 Ce probe nuclei at Nd sites, however, showed a strong deviation from the Brillouin function, which is attributed to the Ce 4f-electron contribution to B hf . V C 2015 AIP Publishing LLC. [http://dx.

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Magnetic resonance studies in ferromagnetic REMn₂X₂(RE=rare earth, X=Si, Ge) materials

Cited by 23 publications

References 5 publications

Magnetic behavior of LaMn2(Si(1−x)Gex)2 compounds characterized by magnetic hyperfine field measurements

Magnetic behavior of LaMn2(Si(1−x)Gex)2 compounds characterized by magnetic hyperfine field measurements

Magnetoresistance anomalies and multiple magnetic transitions in SmMn2Ge2<

The magnetic behavior of the intermetallic compound NdMn2Ge2 studied by magnetization and hyperfine interactions measurements

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Magnetic resonance studies in ferromagnetic REMn2X2(RE=rare earth, X=Si, Ge) materials

Cited by 23 publications

References 5 publications

Magnetic behavior of LaMn2(Si(1−x)Gex)2 compounds characterized by magnetic hyperfine field measurements

Magnetic behavior of LaMn2(Si(1−x)Gex)2 compounds characterized by magnetic hyperfine field measurements

Magnetoresistance anomalies and multiple magnetic transitions in SmMn2Ge2<

The magnetic behavior of the intermetallic compound NdMn2Ge2 studied by magnetization and hyperfine interactions measurements

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Magnetic resonance studies in ferromagnetic REMn₂X₂(RE=rare earth, X=Si, Ge) materials