Negative chemical pressure effects induced by Y substitution for Ca on the ‘exotic’ magnetic behavior of the spin-chain compound, Ca3Co2O6

Rayaprol, Sudhindra; Sampathkumaran, E. V.

doi:10.1007/bf02704206

Cited by 13 publications

(9 citation statements)

References 15 publications

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“…In the spirit of the recent experimental demonstration of negative pressure in ferroelectrics, [40,41] we exploit the multicaloric effect under negative pressure and electric field.…”

Section: Multicaloric Effect Under Mechanical and Electric Fieldsmentioning

confidence: 99%

“…[40] In addition, recent experimental results demonstrated that negative pressure as low as -4 GPa can be realized by the transformation between a lower-density crystal structure and the perovskite phase in freestanding PbTiO 3 nanowires. [41] Although the elastic heating would probably exist even under negative pressure, its contribution is expected to be reduced in single crystals under lower pressure.…”

Section: Multicaloric Effect Under Mechanical and Electric Fieldsmentioning

confidence: 99%

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Towards multicaloric effect with ferroelectrics

Liu

Zhang

et al. 2016

Phys. Rev. B

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Utilizing thermal changes in solid state materials strategically offers caloric-based alternatives to replace current vapor-compression technology. To make full use of multiple forms of the entropy and achieve higher efficiency for designs of cooling devices, the multicaloric effect appears as a cutting-edge concept encouraging researchers to search for multicaloric materials with outstanding caloric properties. Here we report the multicaloric effect in BaTiO 3 single crystals driven simultaneously by mechanical and electric fields and described via a thermodynamic phenomenological model. It is found that the multicaloric behavior is mainly dominated by the mechanical field rather than the electric field, since the paraelectric-toferroelectric transition is more sensitive to mechanical field than to electric field. The use of uniaxial stress competes favorably with pressure due to its much higher caloric strength and negligible elastic thermal change. It is revealed that multicaloric response can be significantly larger than just the sum of mechanocaloric and electrocaloric effects in temperature regions far above the Curie temperature but cannot exceed this limit near the Curie temperature. Our results also show the advantage of the multicaloric effect over the mechanically-mediated electrocaloric effect or electrically-mediated mechanocaloric effect. Our findings therefore highlight the importance of ferroelectric materials to develop multicaloric cooling.2

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“…In the spirit of the recent experimental demonstration of negative pressure in ferroelectrics, [40,41] we exploit the multicaloric effect under negative pressure and electric field.…”

Section: Multicaloric Effect Under Mechanical and Electric Fieldsmentioning

confidence: 99%

Section: Multicaloric Effect Under Mechanical and Electric Fieldsmentioning

confidence: 99%

Towards multicaloric effect with ferroelectrics

Liu

Zhang

et al. 2016

Phys. Rev. B

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“…With these motivations, we present the results of a systematic investigation of the series Ca 3x Gd x Co 2 O 6 through ac and dc magnetization, heat-capacity (C), and complex dielectric measurements down to 1.8K. Among various observations, the findings of emphasis are: (i) Gd substitution lowers T N only marginally with respect to that known for Y substitution [34]. There is a change in the magnetic moment behavior as well, as though the valence of CoI changes with Gd substitution; interestingly, this seems to change even for CoII site in the case of x= 0.7.…”

Section: Introductionmentioning

confidence: 99%

Modifications in the frustrated magnetism, oxidation state of Co and magnetoelectric coupling effects induced by a partial replacement of Ca by Gd in the spin-chain compound Ca₃Co₂O₆

Basu¹,

Singh²,

Sampathkumaran³

2013

J. Phys.: Condens. Matter

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We have systematically investigated the influence of the gradual replacement of Ca by Gd on the magnetic and complex dielectric properties of the well-known geometrically frustrated spin-chain system Ca3Co2O6 (TN = 24 K with additional magnetic transitions below 12 K), by studying the series Ca3−xGdxCo2O6 (x ≤ 0.7), down to 1.8 K. Heat-capacity measurements establish that the reduction of TN with Gd substitution is much less compared to that by Y substitution. The magnetic moment data reveal that there are changes in the oxidation state of Co as well, unlike for Y substitution, beyond x = 0.2. Thus, despite being isovalent, both these substitutions interestingly differ in changing these magnetic properties in these oxides. We propose that the valence electrons of Y and those of R ions play different roles in deciding the magnetic characteristics of these mixed oxides. It is observed that a small amount (x = 0.3) of Gd substitution for Ca is enough to suppress glassy ac magnetic susceptibility behavior for the peak around 12 K. An additional low-temperature magnetic anomaly close to 5 K gets more prominent with increasing Gd concentration as revealed by heat-capacity data. Trends in temperature dependence of complex dielectric behavior were also tracked with varying composition and a frequency dependence is observed, not only for the transition in the region around 10 K (for some compositions), but also for the 5 K transition which is well resolved for a higher concentration of Gd. Thus, the Gd-substituted Ca3Co2O6 series is shown to reveal interesting magnetic and dielectric behaviors of this family of oxides.

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“…To show the evolution of these magnetization steps with F-doping clearly, three dashed lines near these steps are plotted in the gure. Different to the doping effect on Ca- 18 or Co-sites, 30 F-doping at the O-site does not obviously change the magnetization steps, and the position of the magnetization steps were almost the same for all the samples studied. Although F-doping has little inuence on the position of these magnetization steps, the magnetization value of each step decreases with the increase of F-doping content, as shown in Fig.…”

Section: Magnetic Propertiesmentioning

confidence: 68%

“…From the perspective of future applications, searching for an n-type Ca 3 Co 2 O 6 with a low resistivity is imperative. Furthermore, the investigations on the effect of substitution in the Ca 3 Co 2 O 6 system are mainly focused on the Co 10,17 or Ca sites, 18,19 and studies on the substitution effect at the O site have not been reported so far. To fully understand the element substitution effect on the physical properties of Ca 3 Co 2 O 6 , in this work the structural, magnetic and TE properties of F-doped Ca 3 Co 2 O 6 were systematically studied over a large F composition range (0 # x # 0.8).…”

Section: Introductionmentioning

confidence: 99%