A study on crystal field effect and single ion anisotropy in pyrochlore europium titanate (Eu2Ti2O7)

Chattopadhyay, A.; Dasgupta, Pallab; Jana, Yatramohan; Ghosh, D.

doi:10.1016/j.jallcom.2004.03.133

Cited by 27 publications

(9 citation statements)

References 34 publications

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“…The fit shows the thermal energy barrier (E b ) for pure Eu 2 Ti 2 O 7 is 339K and f 0 is of order MHz which is a reasonable value for spin flipping. The thermal energy barrier (339K), thus obtained is of the order of the crystal field (CF) energy level spacing between ground state 7 F 0 and first excited state 7 F 1 ( ~378K or 263 cm -1 ) [17] which suggests the transition is thermally activated and the energy is of the order of single ion anisotropy energy for Eu 3+ ions [20,21]. In order to investigate the underlying freezing mechanism observed in pure Eu 2 Ti 2 O 7 , the "frequency dependence of χ // " (fig.…”

Section: (B)mentioning

confidence: 99%

“…The R 3+ ions are located at the vertices of two diametrically opposed tetrahedra of R 3+ ions i.e they are all having six nearest neighbours [16]. Strong crystal field interaction with the D 3D symmetry causes the R 3+ ionic magnetic susceptibility to be different along the D 3D axis and perpendicular to it, giving rise to Single ion anisotropy (SIA) [17]. In spin ice compounds (Dy 2 Ti 2 O 7 and Ho 2 Ti 2 O 7 etc.…”

Section: Introductionmentioning

confidence: 99%

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High temperature spin-freezing transition in pyrochlore Eu2Ti2O7: A new observation from ac-susceptibility

Pal

Singh

Ghosh

et al. 2018

Journal of Magnetism and Magnetic Materials

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The magnetization (both dc and ac) of pyrochlore Eu 2 Ti 2 O 7 have been investigated. Ac susceptibility (χ / &χ // ) measurements reveal a new unusual spin freezing below 35K for pure Eu 2 Ti 2 O 7 . Frequency dependence of these ac χ // peak positions indicate slow spin relaxation near this temperature and it follows the Arrhenius formulasuggesting a thermally activated relaxation process. The origin of this spin freezing has been attributed essentially to a single ion process which is associated to Eu 3+ spin relaxation. Non-magnetic dilution by Y 3+ ions also confirms the single ion freezing.

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Section: (B)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High temperature spin-freezing transition in pyrochlore Eu2Ti2O7: A new observation from ac-susceptibility

Pal

Singh

Ghosh

et al. 2018

Journal of Magnetism and Magnetic Materials

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“…A similar situation could occur in Eu 2 Ru 2 O 7 in which the excited states 7 F 1 and 7 F 2 could be populated over a wide range of temperatures. [8][9][10] However, the origin of the transition at T 2 and the magnetic structure for the sublattices Eu-Ru remain unsolved.…”

Section: Resultsmentioning

confidence: 99%

Metallic state induced in Eu2Ru2O7 by hole creation and orbital overlap in the t2g bands

Muñoz-Pérez

Cobas

Cadogan

et al. 2012

Journal of Applied Physics

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Articles you may be interested inEnhanced ferromagnetism, metal-insulator transition, and large magnetoresistance in La1−xCaxMn1−xRuxO3 free of eg -orbital double-exchange Magnetic and transport properties of ( La 0.7−2x Eu x )( Ca 0.3 Sr x ) MnO 3 : Effect of simultaneous size disorder and carrier density J. Appl. Phys. 95, 4934 (2004); 10.1063/1.1667258 Effect of Li doping on the magnetotransport properties of La 0.7 Ca 0.3−y Li y MnO 3 system: Decrease of metal-insulator transition temperature

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“…Recently, pyrochlore structured rare earth titanates (RE 2 Ti 2 O 7 ) have attracted much attention because of the spin-ice behaviour of Dy 2 Ti 2 O 7 compounds, low-temperature magnetic properties and large magnetic moments of paramagnetic materials [4][5][6][7][8][9][10][11][12]. Gd 2 Ti 2 O 7 and Er 2 Ti 2 O 7 have paramagnetic ordering at room temperature, but they exhibit antiferromagnetic ordering at very low-temperatures, because of predominant antiferromagnetic coupling [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of combustion synthesized $$\hbox {A}_{2}\mathrm{Ti}_{2}\mathrm{O}_{7}$$ ($$\hbox {A} = \hbox {Gd}$$, Dy and Y) pyrochlore oxides

et al. 2019

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Nanostructured pyrochlore oxides A 2 Ti 2 O 7 (A = Gd, Dy and Y) have been synthesized through a single step auto-igniting citrate complex combustion process. The structure and phase formation of the prepared combustion product were characterized by X-ray diffraction (XRD) analysis. From the XRD patterns, the average crystallite size and lattice strain were calculated using the Williamson-Hall method. Pyrochlore oxides A 2 Ti 2 O 7 (A = Gd, Dy and Y) exhibit a cubic pyrochlore structure with the fd3m space group. The microstructure and average grain size of the samples were examined by scanning electron microscopy. The surface area and pore size of the materials were obtained from Brunauer-Emmett-Teller (BET) analysis. The obtained higher BET surface area of the Gd 2 Ti 2 O 7 material suggests the possibility of excellent photocatalyst activity. The vibrating sample magnetometer studies show that these materials show paramagnetic behaviour at room temperature. These materials have an entropy change that increases when the temperature decreases. So these materials may be used as active magnetic refrigerants at low-temperature.

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A study on crystal field effect and single ion anisotropy in pyrochlore europium titanate (Eu2Ti2O7)

Cited by 27 publications

References 34 publications

High temperature spin-freezing transition in pyrochlore Eu2Ti2O7: A new observation from ac-susceptibility

High temperature spin-freezing transition in pyrochlore Eu2Ti2O7: A new observation from ac-susceptibility

Metallic state induced in Eu2Ru2O7 by hole creation and orbital overlap in the t2g bands

Structural and magnetic properties of combustion synthesized $$\hbox {A}_{2}\mathrm{Ti}_{2}\mathrm{O}_{7}$$ ($$\hbox {A} = \hbox {Gd}$$, Dy and Y) pyrochlore oxides

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