Examination of the critical behavior and magnetocaloric effect of the ferromagnetic Gd-Au-Si quasicrystal approximants

Häussermann, Ulrich, 1964- (author): Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.

Rydh, Andreas (author): Stockholms universitet,Fysikum,Stockholm Univ, Dept Phys, S-10691 Stockholm, Sweden.

(creator_code:org_t)

American Physical Society, 2022
2022
English.
In: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 106:17

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Abstract Subject headings

We investigate the critical behavior and magnetocaloric effects of the Gd-Au-Si (GAS) ferromagnetic quasicrystal approximants, Gd13.7 Au72.7 Si13.6 [referred to as GAS(0)] and Gd15.4 Au68.6 Si16.0 [GAS(100)]. The former is a conventional Tsai-type 1/1 approximant crystal, while the latter has a slightly different atomic decoration from the Tsai type (thus referred to as “pseudo-Tsai” type). Their critical exponents at the ferromagnetic transitions are close to those of the mean-field theory. Both GAS systems exhibit an interesting magnetic-field dependence of the specific heat, which is reflected in the behavior of their magnetocaloric effect (MCE). The MCE is characterized by an adiabatic cooling (heating) effect over a relatively broad temperature range below ∼30 K, which stems from a broad feature in the specific heat.

By the author/editor: Shiino, Takayuki; Gebresenbut, Gir ...; Pay Gómez, Cesar ...; Häussermann, Ulr ...; Nordblad, Per; Rydh, Andreas; show more...; Mathieu, Roland; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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