In:
Journal of Physics: Condensed Matter, IOP Publishing, Vol. 35, No. 24 ( 2023-06-21), p. 245603-
Abstract:
We address the degeneracy of the ground state multiplet on the 5 d 1 Re 6+ ion in double perovskite Ba 2 MgReO 6 using a combination of specific heat measurements and density functional calculations. For Ba 2 MgReO 6 , two different ground state multiplets have previously been proposed—a quartet (with degeneracy N = 4) (Hirai and Hiroi 2019 J. Phys. Soc. Japan 88 064712) and a doublet ( N = 2) (Marjerrison et al 2016 Inorg. Chem. 55 10701). Here we employ two independent methods for the estimation of phonon contribution in heat capacity data to obtain the magnetic entropy S m a g , which reflects the degeneracy of the ground state multiplet N through S m a g = R ln N . In both cases, we obtain that in the temperature range covering 2 to 120 K the released entropy is better described by S m a g = R ln2. The detailed nature of the ground state multiplet in Ba 2 MgReO 6 remains an open question.
Type of Medium:
Online Resource
ISSN:
0953-8984
,
1361-648X
DOI:
10.1088/1361-648X/acc62a
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2023
detail.hit.zdb_id:
1472968-4
detail.hit.zdb_id:
228975-1
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