Valeriy Yu. Verchenko

Ferromagnetic Order, Strong Magnetocrystalline Anisotropy, and Magnetocaloric Effect in the Layered Telluride Fe3−δGeTe2

The ternary transition-metal compound Fe(3-δ)GeTe2 is formed for 0 < δ < 0.3. X-ray diffraction and Mössbauer spectroscopy reveal its layered crystal structure with occasional Fe vacancies in the Fe2 site, whereas no Fe atoms occupy the interlayer space, so that only van der Waals interactions exist between adjacent layers. We explore magnetic behavior and ensuing functional properties of Fe(2.9)GeTe2 via neutron diffraction, thermodynamic and transport measurements, Mössbauer spectroscopy, and electronic structure calculations. Below T(C) = 225 K, Fe(2.9)GeTe2 is ferromagnetically ordered with the magnetic moments of 1.95(5) and 1.56(4) μ(B) at T = 1.5 K, both directed along c, which is the magnetic easy axis. Electronic structure calculations confirm this magnetic structure and reveal a remarkably high easy-axis anisotropy of 4.2 meV/f.u. Mössbauer spectra reveal the magnetic ordering too, although a drastic influence of Fe vacancies on quadrupolar splittings and local magnetic fields has been observed. A moderate magnetocaloric effect with the magnetic entropy change upon the ferromagnetic ordering transition, -ΔS ∼ 1.1 J·kg(-1)·K(-1) at 5 T, is found.

Magnetism of coupled spin tetrahedra in ilinskite-type KCu 5 O 2 (SeO 3 ) 2 Cl 3

Synthesis, thermodynamic properties, and microscopic magnetic model of ilinskite-type KCu5O2(SeO3)2Cl3 built by corner-sharing Cu4 tetrahedra are reported, and relevant magnetostructural correlations are discussed. Quasi-one-dimensional magnetic behavior with the short-range order around 50 K is rationalized in terms of weakly coupled spin ladders (tubes) having a complex topology formed upon fragmentation of the tetrahedral network. This fragmentation is rooted in the non-trivial effect of the SeO3 groups that render the Cu–O–Cu superexchange strongly ferromagnetic even at bridging angles exceeding 110°.

Strong electron-phonon coupling in the intermetallic superconductor Mo8Ga41

Crystals of superconducting Mo

New Fe-based layered telluride Fe3−δAs1−yTe2: synthesis, crystal structure and physical properties

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Effect of Transition Metal Substitution on the Structure and Properties of a Clathrate-Like Compound Eu7Cu44As23

Ga

Structural and thermoelectric properties of TMGa3 (TM = Fe, Co) thin films

_{41}

Synthesis and thermoelectric properties of Re3As6.6In0.4 with Ir3Ge7 crystal structure

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Role of iron in synthetic tetrahedrites revisited

T_{\text{c}}=9.8

Low-Temperature Structure and Thermoelectric Properties of Pristine Synthetic Tetrahedrite Cu12Sb4S13

K) and Mo

Crystal growth, electronic structure, and properties of Ni-substituted FeGa3

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