A reentrant phenomenon in magnetic and dielectric properties of Dy<sub>2</sub>BaNiO<sub>5</sub> and an intriguing influence of external magnetic field

Basu, Tathamay; Paulose, P. L.; Iyer, Kartik K.; Singh, Kiran; Mohapatra, Niharika; Chowki, S.; Gonde, Babu; Sampathkumaran, E. V.

doi:10.1088/0953-8984/26/17/172202

Cited by 29 publications

(30 citation statements)

References 27 publications

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“…25] 31]. In sharp contrast to this behavior of Tb compound, we find that the value does not even exceed a few percent for other R members, e.g., Nd, Gd, Dy and Er members [7,[19][20][21][22][23]. The fact that the Tb member alone stands out in this respect rules out any direct role of the Haldane spin-chain.…”

Section: B Dielectric and Magnetodielectric Behaviormentioning

confidence: 57%

“…The homogeneity of the sample was further confirmed by scanning electron microscope and the composition (within 2%) was confirmed by energydispersive x-ray analysis. Instruments used for measurements of magnetization, heat-capacity (C), and dielectric permittivity as a function of T down to 1.8 K and in magnetic-fields have been described in our earlier publications [7,[19][20][21][22][23]. Bias electric-field (E) measurements were done with the help of a Keithley 6517B electrometer.…”

Section: Methodsmentioning

confidence: 99%

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Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

2017

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The Haldane spin-chain compound, Tb2BaNiO5, has been known to order antiferromagnetically below (TN=) 63 K. The present magnetic studies on the polycrystals bring out that there is another magnetic transition at a lower temperature (T2=) 25 K, with a pronounced magnetic-field induced metamagnetic and metaelectric behavior. Multiferroic features are found below T2 only, and not at TN. The most intriguing observation is that the observed change of dielectric constant (Δε) is intrinsic and largest (e.g., ~ 18% at 15 K) within this Haldane spin-chain family, R2BaNiO5. Taking into account the fact that this trend (that is, the largest value of Δε for Tb case within this family) correlates well with a similar trend in TN (with the values of TN being ~55, 58, 53 and 32 K for Gd, Dy, Ho and Er cases), we believe that the explanation usually offered for this TN behavior in rare-earth systems is applicable for this Δε behavior as well. That is, single-ion anisotropy following crystal-field splitting is responsible for the extraordinary magnetodielectric effect in this Tb case. To our knowledge, such an observation was not made in the past literature of multiferroics.

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Section: B Dielectric and Magnetodielectric Behaviormentioning

confidence: 57%

Section: Methodsmentioning

confidence: 99%

Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

2017

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“…Here we emphasize that the ν-dependence of the features in the same temperature range (below 10 K) both in ac χ and complex dielectric properties prompts us to infer that this compound exhibits 'reentrant multiglass-like' behavior, taking into account that the coupling occurring near T N is not of a glassy type, in analogy to the terminology applied for re-entrant spin-glasses. This observation is interesting, as this kind of 'reentrant mutiglass phenomenon' has been rarely reported for stoichiometric compounds, e.g., in Dy 2 BaNiO 5 [3] and Ca 3 Co 2 O 6 [7]. As in the case of Dy 2 BaNiO 5 , an additional signature of spin-glass, viz., 'local dip' (or 'memory effects') in the dc χ experiments, performed with waiting and without waiting at a given temperature, could not be resolved down to 2 K and hence 'glassiness' is of a different origin, e.g., slow and complex dynamics arising from antiferromagnetically coupled Er and Ni magnetic moments.…”

Section: Results and Discussion Magnetic And Dielectric Behavior Andmentioning

confidence: 79%

Magnetic and dielectric behavior of the spin-chain compound Er2BaNiO5 well below its Néel temperature

Basu

Singh

Mohapatra

et al. 2014

Journal of Applied Physics

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We have recently reported that the Haldane spin-chain system, Er 2 BaNiO 5 , undergoing antiferromagnetic order below (T N = ) 32 K, is characterized by the onset of ferroelectricity near 60K due to magnetoelectric coupling induced by short-range magnetic-order within spin-chains. We have carried out additional magnetic and dielectric studies to understand the properties well below T N . We emphasize here on the following: (i) A strong frequency dependent behaviors of ac magnetic susceptibility and complex dielectric properties have been observed at much lower temperatures (< 8 K), that is, 'reentrant multiglass-like' phenomenon, naturally suggesting the existence of an additional transition well below T N . ii) 'Magnetoelectric phase coexistence' is observed at very low temperature (e.g., T =2K), where the high-field magnetoelectric phase is partially arrested on returning to zero magnetic field after a cycling through metamagnetic transition.# Current address: UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore -452001, India 2 INTRODUCTIONThe Haldane [1] spin-chain systems of the type, R 2 BaNiO 5 (R= Rare-earths), have been paid a lot of attention for the past few decades from magnetism angle. Recently, some members of this family (R= Gd, Dy, Ho and Er) of oxides attracted further interest from the angle of magnetoelectric (ME) / magnetodielectric (MDE) coupling phenomenon [2][3][4][5][6]. A systematic study on the Er member [5] suggested that a displacive-type mechanism involving magnetic ions is responsible for the onset ferroelectricity well above its Néel temperature (T N = 32 K) and that short-range magnetic correlations are interestingly sufficient enough to induce the same. In the case of Dy member, it was noted that, in addition to the multiferroic behavior setting in at (T N =) 58 K, there is an additional transition at temperatures (T) well below T N , as though there is a 'reentrant phenomenon' into a complex multiglass-like state below 10 K. Such a phenomenon is not so commonly known particularly among undoped stoichiometric compounds in the field of multiferroics, barring a few examples (see, Ref. 5,7 and articles cited therein), though the concept of multi-glass was originally discussed in some doped materials [8]. It is therefore of interest to study low temperature properties of other members of this family well below their respective T N . With this primary motivation, in this article, we report the results of our investigation on the Er member well below its T N . The results reveal that there are glassy anomalies both in magnetization and dielectric properties far below T N , characterizing that this compound also belongs to a new family of 'reentrant' multiferroic oxides. Additionally, there are features in the isothermal data attributable to 'magnetoelectric phase-co-existence' phenomenon.

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“…Recently, we carried out exhaustive investigations 4-8 on many heavy rare-earth members of this family (R = Gd, Dy, and Er), bringing out new interesting properties, for example, (i) an additional magnetic transition at temperatures far below respective Néel temperature (T N ), (ii) magnetoelectric coupling, and (iii) not so-commonly known 're-entrant multiglass-like' behavior, that too of unusual types. 5,7 We also brought out magnetic-field-induced metamagnetic transitions and associated magnetodielectric (MDE) coupling effects. We therefore considered it worthwhile to subject one of the light rare-earth members, e.g., Nd 2 BaNiO 5 , for similar investigations for exploration of these anomalies in light rare-earth members of this family.…”

mentioning

confidence: 99%

“…This situation is completely different from that observed for heavy rare-earth members. 5,7,8 In case of heavy rare-earth members in this series [see Fig. 3 in Refs.…”

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confidence: 99%

Magnetic and magnetodielectric coupling anomalies in the Haldane spin-chain system Nd2BaNiO5

et al. 2015

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We report the magnetic, heat-capacity, dielectric and magnetodielectric (MDE) behaviour of a Haldane spin-chain compound containing light rare-earth ion, Nd 2 BaNiO 5 , in detail, as a function of temperature (T) and magnetic field (H) down to 2 K. In addition to the well-known long range antiferromagnetic order setting in at (T N =) 48 K as indicated in dc magnetization (M), we have observed another magnetic transition near 10 K; this transition appears to be of a glassy-type which vanishes with a marginal application of external magnetic field (even H= 100 Oe). There are corresponding anomalies in dielectric constant (ɛ') as well with variation of T. The isothermal M(H) curves at 2 and 5 K reveal the existence of a magnetic-field induced transition around 90 kOe; the isothermal ɛ'(H) also tracks such a metamagnetic transition. These results illustrate the MDE coupling in this compound. Additionally, we observe a strong frequency dependence of a step in ɛ'(T) with this feature appearing around 25-30 K for the lowest frequency of 1 kHz, far below T N . This is attributed to interplay between crystal-field effect and exchange interaction between Nd and Ni, which establishes the sensitivity of dielectric measurements to detect such effects. Interestingly enough, the observed dispersions of the ɛ'(T) curves is essentially H-independent in the entire Trange of measurement, despite the existence of MDE coupling, which is in sharp contrast with other heavy rare-earth members in this series.

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A reentrant phenomenon in magnetic and dielectric properties of Dy₂BaNiO₅ and an intriguing influence of external magnetic field

Cited by 29 publications

References 27 publications

Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

Magnetic and dielectric behavior of the spin-chain compound Er2BaNiO5 well below its Néel temperature

Magnetic and magnetodielectric coupling anomalies in the Haldane spin-chain system Nd2BaNiO5

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A reentrant phenomenon in magnetic and dielectric properties of Dy2BaNiO5 and an intriguing influence of external magnetic field

Cited by 29 publications

References 27 publications

Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

Magnetic and dielectric behavior of the spin-chain compound Er2BaNiO5 well below its Néel temperature

Magnetic and magnetodielectric coupling anomalies in the Haldane spin-chain system Nd2BaNiO5

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A reentrant phenomenon in magnetic and dielectric properties of Dy₂BaNiO₅ and an intriguing influence of external magnetic field