Specific heat in some gadolinium compounds. II. Theoretical model

Blanco, J.A.; Gignoux, D.; Schmitt, D.

doi:10.1103/physrevb.43.13145

Cited by 205 publications

(141 citation statements)

References 13 publications

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“…At the ordering temperature T N = 55 K, we obtain C mag = 24.8 J / mol K and 29.4 J / mol K corresponding with the subtraction of the LaSi data and the f D ͑ D = 340 K͒ values, respectively. Theoretical calculations for Gd compounds 8,18 have indicated that C mag reaches a maximum value of 20.15 J / mol K for the equal moment cases. In the amplitude modulated magnetic structures, the value of C mag is largely reduced and the -like shape is smoothed off at T N .…”

mentioning

confidence: 99%

Field-induced magnetic phase transitions in a GdSi single crystal

Tung¹,

Lees²,

Balakrishnan³

et al. 2005

Phys. Rev. B

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mentioning

confidence: 99%

Field-induced magnetic phase transitions in a GdSi single crystal

Tung¹,

Lees²,

Balakrishnan³

et al. 2005

Phys. Rev. B

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“…Another approach to explain such a behavior of C m below T N has been given by Blanco et al 29 They derived the expressions for C m for the case of the equal moment and the case of amplitude-modulated ͑where the amplitude of the magnetic moment exhibit a periodic variation, with a sinewave type below and near T N ) antiferromagnetic systems, in the mean-field approximation. Under this approach they could successfully explain the heat-capacity behavior of Gd systems, such as, GdCu 2 Si 2 , GdNi 2 Si 2 , GdGa 2 , and GdCu 5 .…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the magnitude of jump in C m at T N can yield information on the magnetic structure of the material. Blanco et al showed that 29 for an amplitude-modulated system…”

Section: Resultsmentioning

confidence: 99%

“…The shape of the hump would depend on the strength of the Fourier transform of the exchange integration. 29 Since entropy has to be constant, any deviation from T 3 behavior in C m , below T N , will result in a decrease in the peak height of C m at T N . Therefore, the magnitude of jump in C m at T N can yield information on the magnetic structure of the material.…”

Section: Resultsmentioning

confidence: 99%

“…We point out that in some cases, e.g., helical ͑which is equal moment͒ and amplitude-modulated magnetic structures may also produce a similar neutron-diffraction pattern. 29 All the above anomalous magnetic behavior points out that the magnetic structure of these materials is not a simple antiferromagnetic structure. Very likely, the magnetic coupling in the plane could be ferromagnetic whereas the planes are coupled antiferromagnetically.…”

Section: ͑34͒mentioning

confidence: 99%

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Low-temperature heat-capacity studies ofR2Ni3Si5
Mazumdar
¹
,
Ghosh
²
,
Nagarajan
³

et al. 1999
Phys. Rev. B
19
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4
0
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We report here our low temperature (2Ϫ30 K) heat capacity, C p measurements of R 2 Ni 3 Si 5 (R ϭPr, Nd, Sm, Gd-Ho). Large peaks in heat capacity data at magnetic transition temperatures (T N ) confirm the bulk nature of magnetic order in these compounds. In Nd 2 Ni 3 Si 5 , Gd 2 Ni 3 Si 5 , and Dy 2 Ni 3 Si 5 , magnetization studies indicated only one magnetic transition, whereas, heat-capacity data show two transitions. T N of the heavier rare-earth member, Tb 2 Ni 3 Si 5 , showing significant deviation from de Gennes scaling is notable. Magnetic entropy, ⌬S, estimated from heat-capacity data suggest that the magnetic ground state is a doublet in R 2 Ni 3 Si 5 (RϭPr, Nd, Sm, Dy, Ho) and a quartet in Tb 2 Ni 3 Si 5 . In all the cases, ⌬S, at T N is slightly less than that expected due to the suggested states, which we attribute to the occurrence of precursor effects of magnetic order above T N . Except for Gd 2 Ni 3 Si 5 , ⌬S of the compounds does not reach the saturation limit of R ln(2Jϩ1) even at 30 K, indicating the presence of crystalline electric field ͑CEF͒ effects. A hump in C p is observed below T N in Gd 2 Ni 3 Si 5 which is interpreted in terms of a possible amplitude-modulated magnetic spin structure. ͓S0163-1829͑99͒12605-5͔

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