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Brabers, J.H.V.J.; Nolten, A.J.; Kayzel, F.E.; Lenczowski, S. H. J.; Buschow, K.H.J.; Boer, F.R. de

doi:10.1103/physrevb.50.16410

Cited by 90 publications

(74 citation statements)

References 6 publications

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“…This lack of "end point memory" is now accepted as a signature of metastability associated with a first order transition [22,23], which is taken as a support for establishing the first order nature of certain vortex matter phase transitions in type-II superconductors [22,23,25]. In this paper we have looked at the AFM state of SmMn 2 Ge 2 which can be reached from both high and low temperature FM state through magnetic phase transitions.The first order nature of these two transitions is already considered [2,4,11,12]. We have now shown the lack of "end point memory" in the minor hysteresis loops and associated metastable behaviour in this AFM state of SmMn 2 Ge 2 .…”

supporting

confidence: 53%

“…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].…”

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confidence: 99%

“…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.…”

mentioning

confidence: 96%

“…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.…”

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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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confidence: 53%

Section: Typeset Using Revt E Xmentioning

confidence: 99%

mentioning

confidence: 96%

mentioning

confidence: 99%

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Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn₂Ge₂

Roy

Chaudhary

Chattopadhyay

et al. 2002

J. Phys.: Condens. Matter

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“…1 Since their magnetic properties are sensitive to the Mn-Mn separations, the RMn 2 Ge 2 compounds are also model systems for the study of the volume dependence of ferromagnetism in metals. 2 The crystal structure of SmMn 2 Ge 2 , as shown in Fig. 1, is of body centered tetragonal BaAl 4 type 3 with the two crystallographically inequivalent Al sites occupied by Mn and Ge atoms.…”

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confidence: 99%

NMR study of the ferromagnetic phases ofSmMn2Ge2as a function o

et al. 1996

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NMR study of the ferromagnetic phases of SmMn2Ge2 as a function of temperature and pressure Lord, J.S.; Riedi, P.C.; Tomka, G.J.; Kapusta, Cz.; Buschow, K.H.J. Link to publication Citation for published version (APA):Lord, J. S., Riedi, P. C., Tomka, G. J., Kapusta, C., & Buschow, K. H. J. (1996). NMR study of the ferromagnetic phases of SmMn2Ge2 as a function of temperature and pressure. Physical Review. B, Condensed Matter, 53(1), 283-288. DOI: 10.1103/PhysRevB.53.283 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. The behavior of the reentrant ferromagnet SmMn 2 Ge 2 has been studied as a function of temperature and pressure using NMR in zero applied field. At atmospheric pressure SmMn 2 Ge 2 is ferromagnetic ͑FM͒ from T t1 Ϸ348 K to T t2 Ϸ196 K, then antiferromagnetic ͑AFM͒ to T t3 Ϸ100 K. The material is again ferromagnetic below T t3 . The behavior of T t3 as a function of pressure has been studied using 55 Mn NMR. The value of dT t3 /dP at low pressure is found to be about Ϫ16 K kbar Ϫ1 , in agreement with earlier work but its magnitude decreases at higher pressure. The value of T t3 at 7.8 kbar is 47 K. The 55 Mn NMR frequency increases with increasing temperature in the range 3-75 K, despite the decrease in magnetization by some 16%. The decrease in magnetization is attributed to the collapse of the ordered Sm state near 75 K. The 147 Sm and 149 Sm NMR could, however, only be observed up to 19 K, because of the rapid increase of the transverse relaxation rate with temperature, so we do not have conclusive evidence that the Sm moment has no influence on the AFM-FM transition at T t3 . A remarkable feature of the Sm NMR is that its frequency at a given temperature is independent of pressure whereas the Mn NMR frequency decreases with increasing pressure.

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Investigation of Magnetic Properties of NdMn2—xCoxGe2 Compounds (x = 0 to 1.0)

Wang

Chen

et al. 1997

phys. stat. sol. (a)

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Strong Mn-Mn distance dependence of the Mn interlayer coupling inSmMn2Ge2<

Cited by 90 publications

References 6 publications

Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn₂Ge₂

Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn₂Ge₂

NMR study of the ferromagnetic phases ofSmMn2Ge2as a function o

Investigation of Magnetic Properties of NdMn2—xCoxGe2 Compounds (x = 0 to 1.0)

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Strong Mn-Mn distance dependence of the Mn interlayer coupling inSmMn2Ge2<

Cited by 90 publications

References 6 publications

Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn2Ge2

Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn2Ge2

NMR study of the ferromagnetic phases ofSmMn2Ge2as a function o

Investigation of Magnetic Properties of NdMn2—xCoxGe2 Compounds (x = 0 to 1.0)

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Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn₂Ge₂

Interesting thermomagnetic history effects in the antiferromagnetic state of SmMn₂Ge₂