Structural and electronic transitions in gadolinium iron borate GdFe3(BO3)4 at high pressures

Gavriliuk, Alexander; Kharlamova, S. A.; Lyubutin, I. S.; Troyan, I. A.; Овчинников, С. Г.; Potseluiko, A. M.; Eremets, M. I.; Boehler, R.

doi:10.1134/1.1830662

Cited by 35 publications

(39 citation statements)

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“…Magnetic ordering of the La-and Nd-iron borates has been confirmed by spectroscopic and magnetic measurements on non oriented single crystals 7,10 . Studies on oriented single crystals have only been carried out for GdFe 3 (BO 3 ) 4 , using a variety of methods 4,8,11,12,13,14 . Recent specific heat, Raman scattering, and Nd 3+ probe absorption measurements revealed a cascade of three spontaneous phase transitions in GdFe 3 (BO 3 ) 4 12 .…”

Section: Introductionmentioning

confidence: 99%

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: 99%

Raman scattering from phonons and magnons inRFe3(BO3)4

et al. 2006

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“…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.…”

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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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“…For ω 2 1, from Eq. (18) it follows that P AI ≈ 1 − πω 2 . In the first order this coincides with the result predicted by the exact LZ formula: P = −πω 2 .…”

Section: Adiabatic Approximationmentioning

confidence: 96%

“…(18) it follows that P AI ≈ 1 − πω 2 . In the first order this coincides with the result predicted by the exact LZ formula: P = −πω 2 . For the adiabatic evolution, ω 2 1, we obtain P AI ≈ 1/π 2 ω 4 (see Fig.…”

Section: Adiabatic Approximationmentioning

confidence: 97%

“…1 time evolution of the Bloch vector, n = |σ | , is shown. The motion begins at the south pole of the two-dimensional sphere S 2 and for ω = 3 ends at the north pole. However for the choice of the parameter ω < 1, numerical simulation shows that the Bloch vector never reaches the north pole, which corresponds to the LS state.…”

Section: Quench Dynamics Induced By High Pressurementioning

confidence: 99%

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Quench dynamics in spin crossover induced by high pressure

Nesterov

Овчинников²,

Iaroshenko³

2013

Open Physics

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Abstract:In this paper we have analytically and numerically studied the dynamics of spin crossover induced by timedependent pressure. We show that quasi static pressure, with a slow dependence on time, yields a spin crossover leading to transition from the high spin (HS) quantum system state to the low spin (LS) state. However, quench dynamics under shockwave load are more complicated. The final state of the system depends on the amplitude and pulse velocity, resulting in the mixture of the HS and LS states. PACS

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Structural and electronic transitions in gadolinium iron borate GdFe3(BO3)4 at high pressures

Cited by 35 publications

References 10 publications

Raman scattering from phonons and magnons inRFe3(BO3)4

Raman scattering from phonons and magnons inRFe3(BO3)4

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

Quench dynamics in spin crossover induced by high pressure

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