Magnetic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>154</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">SmMn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ge</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>as a function of tempera

Tomka, G.J.; Ritter, C.; Riedi, P. C.; Kapusta, Cz.; Kocemba, W.

doi:10.1103/physrevb.58.6330

Cited by 49 publications

(70 citation statements)

References 16 publications

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“…It is clear that the lattice parameter a remains essentially invariant in the ferromagnetic (Fmc) state (at T ¼ 40 K and between 225 and 320 K) while in the antiferromagnetic (AFmc) state (at T ¼ 100 K), a increases with applied field approaching saturation at $2 T. This field induced magnetostriction shows similar trends to the magnetization curve measured at the same temperature [see inset to Fig. 5(c)], providing direct evidence that the unit cell is larger in a ferromagnetic state than in an antiferromagnetic state [18][19][20][21] Application of a magnetic field in the AFmc state region therefore induces both a magnetic phase transition from AFmc to Fmc and simultaneously increases the lattice parameter a [ Fig. 5(c)].…”

Section: -2supporting

confidence: 56%

“…This demonstrates that while geometric criteria are significant in determining the magnetic structures of RMn 2 Ge 2 and related systems, electronic interactions from the different elements present also play a vital role [19]. revealing the presence of a strong magneto-volume effect (spontaneous magnetostriction) associated with the transitions between Fmc and AFmc states, as also observed in related systems [6,18,20,21]. Due to reorientation of crystallites under magnetic field, only the a lattice parameter could be derived accurately from the neutron diffraction patterns collected in an applied magnetic field (B) of 4 T. Figure 5(a) shows that, compared with the data for B ¼ 0 T, the lattice parameter a for B ¼ 4 T does not exhibit obvious dependence on the magnetic state.…”

Section: -2mentioning

confidence: 68%

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Driving Magnetostructural Transitions in Layered Intermetallic Compounds

et al. 2013

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Section: -2supporting

confidence: 56%

Section: -2mentioning

confidence: 68%

Driving Magnetostructural Transitions in Layered Intermetallic Compounds

et al. 2013

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“…Various kinds of magnetic phase transitions, viz., paramagnetic (PM) to ferromagnetic (FM), PM to antiferromagnetic (AFM), FM to AFM, AFM to FM or ferrimagnetic state (at low temperature, T) can be observed in different compounds belonging to this class of materials. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] The unit cell in these compounds, consists of layered structure ..-Mn-Mn-R-Ge(or Si)-R-Mn-Mn-.. stacked along the c-axis. Within the ab-plane, the Mn-Mn interaction is FM-like for all temperatures below the highest ordering temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermomagnetic history effects inSmMn2Ge2

et al. 2002

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The intermetallic compound SmMn 2 Ge 2 , displaying multiple magnetic phase transitions, is being investigated in detail for its magnetization behavior near the 145 K first order ferromagnetic to antiferromagnetic transition occuring on cooling, in particular for thermomagnetic history effects in the magnetization data. The most unusual finding is that the thermomagnetic irreversibility, [= M F CW (T)-M ZF C (T)] at 135 K is higher in intermediate magnetic field strengths. By studying the response of the sample (i.e., thermomagnetic irreversibility and thermal hysteresis) to different histories of application of magnetic field and temperature, we demonstrate how the supercooling and superheating of the metastable magnetic phases across the first order transition at 145 K contribute to overall thermomagnetic irreversibility.

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“…The envelope curve drawn by lowering the field from 1 kOe after this first cycle (see path marked by 3 in the inset of Fig.3) is quite different from the initial envelope curve. The differences in both the end point magnetization and the envelope curves rise steadily with further cycling of field with succesively larger field amplitude (see path marked by 5,6,7,8,9 and 10 in the inset of Fig.3(b)). Same field cycling process does not cause any effect on the end point magnetization and envelope curve in the magnetic state obtained with the experimental protocol no.1 (see Fig.…”

mentioning

confidence: 91%

“…The intermetallic compound SmMn 2 Ge 2 with its interesting magnetic properties has been a subject of intensive study during last two decades [1][2][3][4][5][6][7][8][9][10]. In low applied magnetic fields it shows at least three magnetic transitions as a function of temperature [1][2][3]6,7].…”

mentioning

confidence: 99%

Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn₂Ge₂

Roy

Chaudhary

Chattopadhyay

et al. 2002

J. Phys.: Condens. Matter

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We present results of magnetization measurements showing that the magnetic response of the antiferromagnetic state of SmMn 2 Ge 2 depends on the path used in the field(H)-temperature(T) phase space to reach this state. Distinct signature of metastablity is observed in this antiferromagnetic state when obtained via field-cooling/field-warming paths. The isothermal M-H loops show lack of end-point memory, reminiscent of that seen in metastable vortex states near the field-induced first order phase transition in various type-II superconductors. Typeset using REVT E X 1The intermetallic compound SmMn 2 Ge 2 with its interesting magnetic properties has been a subject of intensive study during last two decades [1][2][3][4][5][6][7][8][9][10]. In low applied magnetic fields it shows at least three magnetic transitions as a function of temperature [1][2][3]6,7].First it undergoes a paramagnetic (PM) to ferromagnetic (FM1) transition at around 350K, followed by an FM1 to antiferromagnetic (AFM) transition at around 160 K (T N 1 ). On reduction of the temperature further this AFM state transforms again into another ferromagnetic (FM2) state around 100 K(T N 2 ). There is a large spread in the reported values of the transition temperatures from FM1 to AFM and AFM to FM2 states. Quality of the samples may be a possible source for the reported differences in the transition temperatures, especially when it is known that the microscopic magnetic properties of RE(rareearth)1-2-2 compomuds are quite sensitive to their underlying crystal lattice structure. On the other hand, there exist now enough evidences from various studies that both of these transitions are probably first order in nature [2,4,11,12]. The first order nature of these magnetic phase transitions can also provide a natural explanation to the reported spread in the transition temperatures. Supercooling(superheating) can take place down(up) to a temperature T * (T * * ) while cooling (heating) across a first order transition point (T N ) [13]. The extent of supercooled/superheated phases will depend on the path followed in the field(H)-temperature(T) phase space [14]. In addition in the samples with defect structures the lower(higher) temperature phase will start nucleating around these defect structures once the sample is cooled(heated) across T N . This nucleation of the lower(higher) T phase will be completed at T * (T * * ), and in the temperature regime T N -T * (T * * -T N ) there will be co-existence of two phases. All these properties will give rise to thermal hysteresis, and such thermal hysteresis is actually observed across the FM2-AFM and AFM-FM1 phase transitions in SmMn 2 Ge 2 [2,4,7].Confined between two FM phase at low and high temperature and reached via first order phase transitions, the AFM phase in SmMn 2 Ge 2 is something special. In this paper, based on our careful dc magnetization studies we shall show that the magnetic response of this AFM state actually depends on the path used in the (H,T) phase space to reach 2 this state. Distinc...

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Magnetic structure of154SmMn2Ge2as a function of tempera

Cited by 49 publications

References 16 publications

Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Thermomagnetic history effects inSmMn2Ge2

Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn₂Ge₂

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Magnetic structure of154SmMn2Ge2as a function of tempera

Cited by 49 publications

References 16 publications

Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Thermomagnetic history effects inSmMn2Ge2

Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn2Ge2

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Product

Resources

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Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn₂Ge₂