Cascade of phase transitions in GdFe3(BO3)4

Levitin, R. Z.; Popova, E. A.; Chtsherbov, R. M.; Vasiliev, A. N.; Попова, М. Н.; Чукалина, Е. П.; Климин, С. А.; Loosdrecht, P.H.M. van; Fausti, Daniele; Безматерных, Л. Н.

doi:10.1134/1.1776236

Cited by 57 publications

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“…Raman studies of RFe 3 (BO 3 ) 4 were performed for R=La and Nd at room temperature 15 . Preliminary temperature dependent results on the R=Gd compound have also been reported recently 12 . The present work investigates two different aspects of the rare-earth iron borates.…”

Section: Introductionmentioning

confidence: 63%

“…Such a drastic change in the spin configuration would induce a major change in the two-magnon dispersion and inelastic scattering spectra. The picture of a reorientational phase transition at T R , as proposed in 12,13 , survives assuming an easy-axis/easy-plane anisotropy perpendicular to the c-axis in the temperature region T R < T < T N . Indeed, considering a simple Heisenberg-type Hamiltonian, where the interaction depends only on the nearest neighbor scalar product, an easy axis anisotropy perpendicular or parallel to the c-axis would produce similar magnetic excitation spectra and therefore similar two-magnon spectra.…”

Section: Magnetic Scatteringmentioning

confidence: 77%

“…This transition is accompanied by a polarization of the Gd spin subsystem. The second magnetic transition is observed at 9 K, and has been identified as a first-order Fe spin-reorientation transition 12 . A detailed picture of magnetic phase transitions in GdFe 3 (BO 3 ) 4 as a function of temperature and magnetic field has recently been suggested in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Raman scattering from phonons and magnons inRFe3(BO3)4

et al. 2006

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Inelastic light scattering spectra of several members of the RFe3(BO3)4 family reveal a cascade of phase transitions as a function of temperature, starting with a structural, weakly first order, phase transition followed by two magnetic phase transitions. Those consist of the ordering of the Fe-spin sublattice revealed by all the compound, and a subsequent spin-reorientational transition for GdFe3(BO3)4. The Raman data evidence a strong coupling between the lattice and magnetic degrees of freedom in these borates. The Fe-sublattice ordering leads to a strong suppression of the low energy magnetic scattering, and a multiple peaked two-magnon scattering continuum is observed. Evidence for short-range correlations is found in the 'paramagnetic' phase by the observation of a broad magnetic continuum in the Raman data, which persists up to surprisingly high temperatures.

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Section: Introductionmentioning

confidence: 63%

Section: Magnetic Scatteringmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

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Raman scattering from phonons and magnons inRFe3(BO3)4

et al. 2006

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“…They possess magnetic structures which change as a function of temperature, external magnetic field and substitutions in the rareearth subsystem. 1,2,3,4 It was recently discovered that RFe 3 (BO 3 ) 4 , (R = Gd, Nd) exhibits multiferroic features, i.e. the coexistence of elastic, magnetic and electric order parameters.…”

Section: Introductionmentioning

confidence: 99%

Magnetization and specific heat ofTbFe3(BO3)4: Experiment and crystal-field calculations

et al. 2007

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We have studied the thermodynamic properties of single-crystalline TbFe3(BO3)4. Magnetization measurements have been carried out as a function of magnetic field (up to 50 T) and temperature up to 350 K with the magnetic field both parallel and perpendicular to the trigonal c-axis of the crystal. The specific heat has been measured in the temperature range 2-300 K with a magnetic field up to 9 T applied parallel to the c-axis. The data indicate a structural phase transition at 192 K and antiferromagnetic spin ordering at TN ≈ 40 K. A Schottky anomaly is present in the specific heat data around 20 K, arising due to two low-lying energy levels of the Tb 3+ ions being split by f-d coupling. Below T N magnetic fields parallel to the c-axis drive a spin-flop phase transition, which is associated with a large magnetization jump. The highly anisotropic character of the magnetic susceptibility is ascribed mainly to the Ising-like behavior of the Tb 3+ ions in the trigonal crystal field. We describe our results in the framework of an unified approach which is based on mean-field approximation and crystal-field calculations.

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“…The thermodynamic signature of the magnetic phase transitions at T N and T SR is given by sharp peaks of the zero-field heat capacity 21 at the phase transitions. In external magnetic fields, H ʈ c, the heat capacity peak at T SR shifts to lower T, in accordance with the magnetic and dielectric data discussed above.…”

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confidence: 99%

Magnetic field effect and dielectric anomalies at the spin reorientation phase transition ofGdFe3(BO3)4

et al. 2006

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GdFe 3 ͑BO 3 ͒ 4 exhibits a structural phase transition at 156 K, antiferromagnetic order of the Fe 3+ moments at 36 K, followed by a spin reorientation phase transition at 9 K. The reorientation phase transition is studied through dielectric, magnetic, and heat capacity measurements under the application of external magnetic fields of up to 7 kOe. The dielectric constant indicates the existence of two distinct anomalies at T SR = 9 K that separate in temperature under external magnetic fields. The spin rotation phase transition is proven to be of the first-order nature through the magnetic analog of the Clausius-Clapeyron equation. Magnetodielectric effect of up to 1% is observed at 8 K and 7 kOe. The uniaxial magnetocaloric effect along the c axis is observed below the spin reorientation phase transition of 9 K. GdFe 3 ͑BO 3 ͒ 4 belongs to the trigonal system with space group R32. It is similar to huntite CaMg 3 ͑CO 3 ͒ 4 , a trigonal trapezohedral structure that is one of the five trigonal types. Borate crystals of this category are appealing because of their possible applications as single crystal minilasers due to their good luminescent and nonlinear optical properties. In particular for GdFe 3 ͑BO 3 ͒ 4 single crystals, recent studies have focused on the better understanding of its optical properties, and at the same time on its magnetic properties through phase matching of absorption and second harmonic generation spectra. 1,2 The magnetic properties of the rareearth iron borates are also of fundamental interest because of the existence and mutual interference of two magnetic subsystems ͑Fe and Gd͒. The understanding of the magnetic orders of the gadolinium and iron sublattices, and the coupling between the iron spins and the gadolinium moments that contributes to the crystal's rich magnetic properties is of fundamental importance.The crystal structure of huntite has been analyzed and described elsewhere, 3-5 it consists of GdO 6 bipyramids and FeO 6 octahedrons. The octahedrons form threefold helicoidal chains along the c axis. The bipyramids are located between three nearly equal distant octahedrons. Rare-earth iron borates, RFe 3 ͑BO 3 ͒ 4 ͑R =Eu to Ho, and Y͒, undergo a structural transition at higher temperatures and an antiferromagnetic ͑AFM͒ transition involving the Fe spins at T N Ϸ 35 K. 6 For R = Gd a weakly first-order structural phase transition at T 1 = 156 K changes the structural symmetry from R32 to P3 1 2 1 . 5 A second-order phase transition at T N = 36 K results in the AFM ordering of the Fe 3+ magnetic moments aligned in the basal plane. At T SR = 9 K, another sharp phase transition occurs characterized by a spin reorientation of the Fe 3+ magnetic moments by 90°from the basal plane to the c axis.The coupling between the Gd moments and the Fe spins at low temperatures is strong in GdFe 3 ͑BO 3 ͒ 4 and it was speculated that the reorientation of the AFM iron spin system is triggered by the anisotropy of the Gd moments aligned with the c axis. 6 This exchange interaction is indirect and ...

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Cascade of phase transitions in GdFe3(BO3)4

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Cited by 57 publications

References 7 publications

Raman scattering from phonons and magnons inRFe3(BO3)4

Raman scattering from phonons and magnons inRFe3(BO3)4

Magnetization and specific heat ofTbFe3(BO3)4: Experiment and crystal-field calculations

Magnetic field effect and dielectric anomalies at the spin reorientation phase transition ofGdFe3(BO3)4

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