Structural discontinuity in the hexagonal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mi>T</mml:mi><mml:mtext>Al</mml:mtext></mml:mrow></mml:math>compounds: Experiments and density-functional theory calculations

Prchal, J.; Javorský, P.; Rusz, Ján; Boer, Frank de; Diviš, M.; Kitazawa, Hideaki; Dönni, A.; Daniš, S.; Sechovský, V.

doi:10.1103/physrevb.77.134106

Cited by 29 publications

(28 citation statements)

References 25 publications

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“…The weak antiferromagnetic reflections and the low quality of this sample, that was caused probably by vicinity of the structural transition and possible existence of two different crystal phases at low temperature in this compound (different a, c parameters due to forbidden c/a ratio; see e.g. [8,14]), prevented us from determining the magnetic structure in more detail. Therefore only the information about the AF order without any other detail of magnetic structure is given in Table 2.…”

Section: Resultsmentioning

confidence: 96%

Magnetism in DyNi1−Cu Al pseudoternary series

Prchal

Javorský²,

Vejpravová³

et al. 2010

Intermetallics

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Section: Resultsmentioning

confidence: 96%

Magnetism in DyNi1−Cu Al pseudoternary series

Prchal

Javorský²,

Vejpravová³

et al. 2010

Intermetallics

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“…TbNiAl shows an abrupt transition in the lattice parameters around 110 K (while the space group is conserved), which is accompanied by sudden change in the resistivity [36,37]. Application of hydrostatic pressure on TbNiAl lowers the structural transition temperature, which vanishes completely for pressures ≽0.55 GPa [37].…”

Section: Rnix Compoundsmentioning

confidence: 99%

Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

253

124

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RTX (R=rare earths, T= 3d/4d/5d, transition metals such as Sc, Ti, Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, Au, and X=p-block elements such as Al, Ga, In, Si, Ge, Sn, As, Sb, Bi) series is a huge family of intermetallics compounds. These compounds crystallize in different crystal structures depending on the constituents. Though these compounds have been known for a long time, they came to limelight recently in view of the large magnetocaloric effect (MCE) and magnetoresistance (MR) shown by many of them. Most of these compounds crystallize in hexagonal and tetragonal crystal structures. Some of them show crystal structure modification with annealing temperature; while a few of them show iso-structural transition in the paramagnetic regime. Their magnetic ordering temperatures vary from very low temperatures to temperatures well above room temperature (~510 K). Depending on the crystal structure, they show a variety of magnetic and electrical properties.These compounds have been characterized by means of a variety of techniques/measurements such as x-ray diffraction, neutron diffraction, magnetic properties, heat capacity, magnetocaloric properties, electrical resistivity, magnetoresistance, thermoelectric power, thermal expansion, Hall effect, optical properties, XPS, Mössbauer spectroscopy, ESR, μSR, NMR, NQR etc. Some amount of work on theoretical calculations on electronic structure, crystal field interaction and exchange interactions has also been reported. The interesting aspect of this series is that they show a variety of physical properties such as Kondo effect, heavy fermion behavior, spin glass state, intermediate valence, superconductivity, multiple magnetic transitions, metamagnetism, large MCE, large positive as well as negative MR, spin orbital compensation, magnetic polaronic behavior, pseudo gap effect etc.Except Mn, no other transition metal in these compounds possesses considerable magnetic moments.Because of this RMnX compounds in general have high ordering temperatures. Interstitial modification using hydrogen and nitrogen is found to alter their crystal structures and magnetic properties considerably. RTX compounds also show interesting pressure effects on their structural and magnetic properties. In summary, these compounds show variety of physical properties over a wide range of temperatures. This review is intended to cover all the important results obtained in this family, particularly in the last few years.

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“…However, an increase of magnetic moment is observed neither for DyPdAl nor for HoPdAl, indicating that Pd is non-magnetic and does not contribute to the density of states at the Fermi level [21]. The RPdAl compounds exhibit complex magnetic structures and possess different magnetic-phase transitions at low temperatures [18][19][20][21][22][23][24][25], which induce interesting magnetocaloric properties [26,27]. In this paper, we report on the magnetic properties and the MCEs of HoPdAl compound.…”

Section: Introductionmentioning

confidence: 92%

Large magnetocaloric effect in metamagnetic HoPdAl

Shen

2011

Sci. China Technol. Sci.

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Magnetic properties and magnetocaloric effects (MCEs) of the HoPdAl compounds with the hexagonal ZrNiAl-type and the orthorhombic TiNiSi-type structures are investigated. Both the compounds are found to be antiferromagnet with the Néel temperature T N =12 and 10 K, respectively. A field-induced metamagnetic transition from antiferromagnetic (AFM) state to ferromagnetic (FM) state is observed below T N . For the hexagonal HoPdAl, a small magnetic field can induce an FM-like state due to a weak AFM coupling, which leads to a high saturation magnetization and gives rise to a large MCE around T N . The maximal value of magnetic entropy change (S M ) is 20.6 J/kg K with a refrigerant capacity (RC) value of 386 J/kg for a field change of 0-5 T. For the orthorhombic HoPdAl, the critical field required for metamagnetic transition is estimated to be about 1.5 T, showing a strong AFM coupling. However, the maximal S M value is still 13.7 J/kg K around T N for a field change of 0-5 T. The large reversible S M and considerable RC suggest that HoPdAl may be an appropriate candidate for magnetic refrigerant in a low temperature range. HoPdAl compound, magnetocaloric effect, metamagnetic transitionCitation:

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Structural discontinuity in the hexagonalRTAlcompounds: Experiments and density-functional theory calculations

Cited by 29 publications

References 25 publications

Magnetism in DyNi1−Cu Al pseudoternary series

Magnetism in DyNi1−Cu Al pseudoternary series

Review on magnetic and related properties of RTX compounds

Large magnetocaloric effect in metamagnetic HoPdAl

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