YPd2Al3—A new superconducting compound

Pospíšil, Jiří; Kratochvílová, Marie; Diviš, M.; Prokleška, Ján; Vejpravová, J.; Sechovský, V.

doi:10.1016/j.jallcom.2010.10.193

Cited by 7 publications

(4 citation statements)

References 23 publications

(32 reference statements)

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“…Similar situation can occur in intermetallics as was found for example in Ref. 52 because standard BCS behavior of the La compound was found in Ref. 31 with (∆C P ) TSC /γT SC = 1.3 which is 90 % of the BCS-predicted value.…”

Section: Yir2si2supporting

confidence: 83%

Superconductivity in the YIr2Si2 and LaIr2Si2 Polymorphs

Vališka,

Pospíšil,

Prokleška

et al. 2012

Preprint

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We report on existence of superconductivity in YIr2Si2 and LaIr2Si2 compounds in relation to crystal structure. The two compounds crystallize in two structural polymorphs, both tetragonal. The high temperature polymorph (HTP) adopts the CaBe2Ge2-structure type (space group P4/nmm) while the low temperature polymorph (LTP) is of the ThCr2Si2 type (I4/mmm). By studying polycrystals prepared by arc melting we have observed that the rapidly cooled samples retain the HTP even at room temperature (RT) and below. Annealing such samples at ≥ 900 • C followed by slow cooling to RT provides the LTP. Both, the HTP and LTP were subsequently studied with respect to magnetism and superconductivity by electrical resistivity, magnetization, AC susceptibility and specific heat measurements. The HTP and LTP of both compounds respectively, behave as Pauli paramagnets. Superconductivity has been found exclusively in the HTP of both compounds below TSC (= 2.52 K in YIr2Si2 and 1.24 K in LaIr2Si2). The relations of magnetism and superconductivity with the electronic and crystal structure are discussed with comparing experimental data with the results of first principles electronic structure calculations.

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Section: Yir2si2supporting

confidence: 83%

Superconductivity in the YIr2Si2 and LaIr2Si2 Polymorphs

Vališka,

Pospíšil,

Prokleška

et al. 2012

Preprint

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“…NdPd2Al3 becomes antiferromagnetic at TN = 6.5 K but TN varies in the off-stoichiometric samples 6) . The most intriguing cases are the frustrated triangular lattice antiferromagnets GdPd2Al3 and SmPd2Al3 [7][8][9] , and superconductors (SC) LaPd2Al3 (TSC = 0.85 K) 10) and YPd2Al3 (TSC = 2.2 K) 11) . It is worth noting that this group also covers the unique actinide SCs UPd2Al3 12) , UNi2Al3 13) and ThPd2Al3 14) .…”

Section: Introductionmentioning

confidence: 99%

ScPd 2 Al 3 – New polymorphic phase in Al-Pd-Sc system

Pospíšil

Haga

Nakajima

et al. 2017

Solid State Communications

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We have discovered a new compound of the composition ScPd2Al3 crystallizing in unknown structure type. Moreover, ScPd2Al3 reveals polymorphism. We have found an orthorhombic crystal structure at room temperature and a high temperature cubic phase. The polymorphic phases are separated by a reversible first order transition at 1053°C with a hysteresis of 19°C. ScPd2Al3 exists as a very stable intermetallic phase just in the vicinity of the icosahedral quasicrystal Tsaitype i-phase Al54Pd30Sc16.

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“…The REPd 2 Al 3 compounds are therefore an interesting playground for theoreticians as they are modeling examples to study rare earth elements magnetism due to their high variability of the physical properties connected with a simple and high symmetry crystal structure. 10,[13][14][15] Although physical properties of all compounds in the REPd 2 Al 3 series were subjected to intensive research activities, yet the two most interesting cases -Gd and Sm compounds remain poorly understood despite the recent progress within the last two years. 13,16 SmPd 2 Al 3 was described as an antiferromagnet with strong uniaxial anisotropy even in the paramagnetic state with an easy-magnetization direction along the crystallographic axis c. Four successive magnetic transitions have been identified in the temperature dependence of the specific heat at temperatures T 3 = 3.4 K, T 2 = 3.9 K, T 1 = 4.3 K and T C = 12.5 K. The high number of the magnetic phase transitions and the series of four magnetic field induced transitions detected at 0.03, 0.35, 0.5, and 0.75 T, respectively, at 1.8 K yield a complex magnetic phase diagram.…”

Section: Introductionmentioning

confidence: 99%

“…This leads to various types of magnetic order (Ce, Nd, Sm and Gd) [3][4][5][6][7] or contrary paramagnetic ground state (Pr) 8 and heavy fermion behavior (Ce). 9 Finally, the Y and La compounds are superconductors [10][11][12] . The REPd 2 Al 3 compounds are therefore an interesting playground for theoreticians as they are modeling examples to study rare earth elements magnetism due to their high variability of the physical properties connected with a simple and high symmetry crystal structure.…”

Section: Introductionmentioning

confidence: 99%

Complex magnetic phase diagram of a geometrically frustrated Sm lattice: Magnetometry and neutron diffraction study of SmPd2Al3

et al. 2013

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Magnetism in SmPd 2 Al 3 was investigated on a single crystal by magnetometry and neutron diffraction. SmPd 2 Al 3 represents a distinctive example of the Sm magnetism exhibiting complex magnetic behavior at low temperatures with four consecutive magnetic phase transitions at 3.4, 3.9, 4.3 and 12.5 K. The rich magnetic phase diagram of this compound reflects the specific features of the Sm 3+ ion, namely the energy nearness of the ground-state multiplet J = 5/2 and the first excited multiplet J = 7/2 in conjunction with strong crystal field influence. Consequently, a significantly reduced Sm magnetic moment in comparison with the theoretical Sm 3+ free-ion value is observed. Despite the strong neutron absorption by natural samarium and the small Sm magnetic moment (~ 0.2 µ B ) we have successfully determined the magnetic k-vector (1/3, 1/3, 0) of the phase existing in the temperature interval 12.5 -4.3 K. This observation classifies the SmPd 2 Al 3 compound as a magnetically frustrated system. The complex magnetic behavior of this material is further illustrated by kinetic effects of the magnetization inducing rather complicated magnetic structure with various metastable states.

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YPd2Al3—A new superconducting compound

Cited by 7 publications

References 23 publications

Superconductivity in the YIr2Si2 and LaIr2Si2 Polymorphs

Superconductivity in the YIr2Si2 and LaIr2Si2 Polymorphs

ScPd 2 Al 3 – New polymorphic phase in Al-Pd-Sc system

Complex magnetic phase diagram of a geometrically frustrated Sm lattice: Magnetometry and neutron diffraction study of SmPd2Al3

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