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Morellón, L.; Arnold, Z.; Magén, Cesar; Ritter, C.; Prokhnenko, O.; Skorokhod, Y.; Algarabel, P. A.; Ibarra, M. R.; Kamarád, J.

doi:10.1103/physrevlett.93.159901

Cited by 57 publications

(77 citation statements)

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“…1͒, which are different from Gd 5 ͑Si x Ge 1−x ͒ 4 , are decoupled by about 10 K and less than 5 K when x = 0.5 and 0.55, respectively. 10,11 Moreover, the separate crystallographic and magnetic phase transitions can be recoupled in a polycrystalline Tb 5 Si 2 Ge 2 by applying hydrostatic pressures greater than 8.6 kbar, 12 or by magnetic fields greater than 10 kOe when applied along the easy magnetization direction, i.e., along the a axis, of a Tb 5 Si 2.2 Ge 1.8 single crystal. 13 In either case, the compound transforms from the monoclinic paramagnetic to the orthorhombic ferromagnetic state.…”

Section: Introductionmentioning

confidence: 99%

Magnetic phase transitions and ferromagnetic short-range correlations in single-crystalTb5Si2.2Ge1.8

et al. 2008

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Magnetic phase transitions in a Tb 5 Si 2.2 Ge 1.8 single crystal have been studied as a function of temperature and magnetic field. Magnetic-field dependencies of the critical temperatures are highly anisotropic for both the main magnetic ordering process occurring around 120 K and a spin reorientation transition at ∼70 K. Magnetic-field-induced phase transitions occur with the magnetic field applied isothermally along the a and b axes (but not along the c axis) between 1.8 and 70 K in fields below 70 kOe. Strong anisotropic thermal irreversibility is observed in the Griffiths phase regime between 120 and 200 K with applied fields ranging from 10 to 1000 Oe. Our data (1) show that the magnetic and structural phase transitions around 120 K are narrowly decoupled; (2) uncover the anisotropy of ferromagnetic short-range order in the Griffiths phase; and (3) Magnetic phase transitions in a Tb 5 Si 2.2 Ge 1.8 single crystal have been studied as a function of temperature and magnetic field. Magnetic-field dependencies of the critical temperatures are highly anisotropic for both the main magnetic ordering process occurring around 120 K and a spin reorientation transition at ϳ70 K. Magnetic-field-induced phase transitions occur with the magnetic field applied isothermally along the a and b axes ͑but not along the c axis͒ between 1.8 and 70 K in fields below 70 kOe. Strong anisotropic thermal irreversibility is observed in the Griffiths phase regime between 120 and 200 K with applied fields ranging from 10 to 1000 Oe. Our data ͑1͒ show that the magnetic and structural phase transitions around 120 K are narrowly decoupled; ͑2͒ uncover the anisotropy of ferromagnetic short-range order in the Griffiths phase; and ͑3͒ reveal some unusual magnetic domain effects in the long-range ordered state of the Tb 5 Si 2.2 Ge 1.8 compound. The temperature-magnetic field phase diagrams with field applied along the three major crystallographic directions have been constructed.

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Section: Introductionmentioning

confidence: 99%

Magnetic phase transitions and ferromagnetic short-range correlations in single-crystalTb5Si2.2Ge1.8

et al. 2008

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“…The study of other compounds of the family with non-zero rare earth orbital momentum is necessary to understand the origin of magnetocrystalline anisotropy in these compounds and its relevance in the magnetocaloric properties. The use of hydrostatic pressure in these materials has demonstrated to be an interesting approach to analyse the coupling between the crystal structure and the magnetism 1,15,16,20,[24][25][26][27] . Thus, the aim of the present work is to investigate the magnetic properties of single crystalline Er 5 Si 4 under hydrostatic pressure.…”

Section: Introductionmentioning

confidence: 99%

Magnetism and magnetocaloric effect of single-crystal Er5Si4under pressure

Marcano¹,

Algarabel²,

Fernández³

et al. 2012

Phys. Rev. B

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Magnetic and magnetocaloric properties of single crystalline Er5Si4 have been investigated as a function of the applied magnetic field (up to 50 kOe) and the hydrostatic pressure (up to 10 kbar) in the 5-300 K temperature range along the three main crystallographic directions. The magnetization isotherms show a highly anisotropic behaviour with the easy-magnetization direction along the b-axis for the low-pressure monoclinic and high-pressure orthorhombic structures, in good agreement with previous neutron scattering experiments. Below T C the approach to the saturation shows a step-like behaviour when the magnetic field is applied along the hard directions. The steps are sharper as the pressure increases. At constant magnetic field change, increasing the pressure induces a highly anisotropic enhancement of the magnetic entropy change. An enhancement of 20 % is observed along the easy axis b, where the magnetic entropy change is maximum. The different evolution of the magnitude and temperature dependence of the magnetocaloric effect (MCE) along the three crystallographic directions with pressure is discussed.

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“…3 Studies suggest that the structural contribution to entropy change, ΔS str , is of the order of 40-60% of the total entropy change, ΔS Total . 4,5,6 We use here the separation of the latent heat and the heat capacity terms to probe the first order characteristics of the field driven phase transition in single crystal Gd 5 Si 2 Ge 2 with the field applied along the b-axis.…”

Section: Introductionmentioning

confidence: 99%

Asymmetry of the latent heat signature in b-axis oriented single crystal Gd₅Si₂Ge₂

Morrison¹,

Pecharsky

Gschneidner

et al. 2011

MRS Proc.

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A 100 micron fragment of a b-axis oriented single crystal Gd5Si2Ge2 has been studied using microcalorimetry, enabling the separate measurement of the heat capacity and the latent heat. The sample was taken from the same crystal previously studied with Hall probe imaging, which showed that the phase transition is seeded by a second phase of Gd5Si1.5Ge1.5 nanoplatelets on the increasing field sweep direction only. The multiple transition features observed in the latent heat signature suggests a nucleation size of approximately 20 μm, consistent with the lengthscale suggested by Hall imaging. The difference in nucleation and growth process with field sweep direction is clearly identified in the latent heat. We show that the latent heat contribution to the entropy change is of the order of 50% of the total entropy change and unlike other systems studied, the transition does not broaden (and the latent heat contribution does not diminish significantly) as magnetic field and temperature are increased within the parameter range explored in these experiments.

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Publisher's Note: Pressure Enhancement of the Giant Magnetocaloric Effect inTb5Si2G
L. Morellón¹,
Z. Arnold²,
Cesar Magén³
et al.

Cited by 57 publications

References 0 publications

Magnetic phase transitions and ferromagnetic short-range correlations in single-crystalTb5Si2.2Ge1.8

Magnetic phase transitions and ferromagnetic short-range correlations in single-crystalTb5Si2.2Ge1.8

Magnetism and magnetocaloric effect of single-crystal Er5Si4under pressure

Asymmetry of the latent heat signature in b-axis oriented single crystal Gd₅Si₂Ge₂

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Publisher's Note: Pressure Enhancement of the Giant Magnetocaloric Effect inTb5Si2GL. Morellón1, Z. Arnold2, Cesar Magén3 et al.

Cited by 57 publications

References 0 publications

Magnetic phase transitions and ferromagnetic short-range correlations in single-crystalTb5Si2.2Ge1.8

Magnetic phase transitions and ferromagnetic short-range correlations in single-crystalTb5Si2.2Ge1.8

Magnetism and magnetocaloric effect of single-crystal Er5Si4under pressure

Asymmetry of the latent heat signature in b-axis oriented single crystal Gd5Si2Ge2

Contact Info

Product

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Publisher's Note: Pressure Enhancement of the Giant Magnetocaloric Effect inTb5Si2G
L. Morellón¹,
Z. Arnold²,
Cesar Magén³
et al.

Asymmetry of the latent heat signature in b-axis oriented single crystal Gd₅Si₂Ge₂