Specific heat in some gadolinium compounds. I. Experimental

Bouvier, M.; Lethuillier, P.; Schmitt, D.

doi:10.1103/physrevb.43.13137

Cited by 333 publications

(185 citation statements)

References 17 publications

Supporting

Mentioning

175

Contrasting

Order By: Relevance

“…The parameter r 2 was determined from the requirement that C mag should vanish at T H , resulting in a C lat that tends to C tot at T H . For the present case of Sr 3 CuPtO 6 with Sr 3 ZnPtO 6 as the reference sample, the single parameter correction factor (r)(which is valid in the low T region i.e., T ≪ Θ D only) estimated from the difference in the mass of the atoms is almost equal to 1 30 . Therefore, the parameter r 1 was chosen as the smallest value for which C lat does not cross C tot over the whole T -range.…”

Section: Appendix: Calculation Of C Latmentioning

confidence: 99%

Magnetic susceptibility and heat capacity investigations of the unconventional spin-chain compoundSr3CuPtO6

et al. 2004

View full text Add to dashboard Cite

The Heisenberg spin chain compound Sr3CuPtO6 is investigated by magnetic susceptibility and heat capacity measurements. Sr3CuPtO6 has an unconventional chain structure in the sense that i) the spin half copper atoms are arranged in a zigzag chain structure, and ii) neighboring Cu atoms along the chains are separated by spin zero platinum atoms. We report that this compound shows broad features in the temperature dependence of both the magnetic contribution to the heat capacity and the magnetic susceptibility. Despite the unconventional nature of the spin chain structure, this set of data exhibits good agreement with theoretical models for a classical S = 1 2Heisenberg spin chain compound. The values of the intra-chain coupling constant, obtained by different techniques, are found to be very close to each other. The low temperature heat capacity data (below ∼ 6 K) exhibit a deviation from the theoretically expected behavior, which could be related to a small energy gap in the spin excitation spectrum.

show abstract

Section: Appendix: Calculation Of C Latmentioning

confidence: 99%

Magnetic susceptibility and heat capacity investigations of the unconventional spin-chain compoundSr3CuPtO6

et al. 2004

View full text Add to dashboard Cite

show abstract

“…It has been reported 19,20 that the heat capacity of Figs. 6͑a͒-6͑c͒ show the variation of the magnetic entropy ͑S M ͒ with temperature.…”

Section: ͑1͒mentioning

confidence: 99%

Effect of Ge substitution for Si on the anomalous magnetocaloric and magnetoresistance properties of GdMn2Si2 compounds

Kumar

Singh

Суреш

et al. 2007

Journal of Applied Physics

View full text Add to dashboard Cite

The effect of distributed exchange parameters on magnetocaloric refrigeration capacity in amorphous and nanocomposite materials J. Appl. Phys. 111, 07A334 (2012) Particle size dependent hysteresis loss in La0.7Ce0.3Fe11.6Si1.4C0.2 firstorder systems Appl. Phys. Lett. 100, 072403 (2012) Magnetocaloric effect and refrigerant capacity in 0.44, 0.46 The effect of Ge substitution on the magnetization, heat capacity, magnetocaloric effect, and magnetoresistance of GdMn 2 Si 2−x Ge x ͑x = 0, 1, and 2͒ compounds has been studied. The magnetic transition associated with the Gd ordering is found to change from second order to first order on Ge substitution. Magnetic contributions to the total heat capacity and the entropy have been estimated. Magnetocaloric effect has been calculated in terms of adiabatic temperature change ͑⌬T ad ͒ as well as isothermal magnetic entropy change ͑⌬S M ͒ using the heat capacity data. The temperature dependence of the magnetocaloric effect in all the three compounds have shown broad peaks. The maximum values of ⌬S M and ⌬T ad for GdMn 2 Ge 2 are found to be 5.9 J / kg K and 1.2 K, respectively. The magnetoresistance is found to be very large and positive with a maximum value of about 22% in the case of GdMn 2 Ge 2 . In the other two compounds also, the magnetoresistance is predominantly positive, except in the vicinity of the Gd ordering temperature. The anomalous nature of the magnetocaloric effect and the magnetoresistance has been attributed to the canted magnetic structure of these compounds.

show abstract

“…15͒ ͑tetragonal structure͒ and in the cases of other materials, such as GdCu 2 Si 2 , GdNi 2 Si 2 , GdGa 2 , and GdCu 5 . 25 In the case of Gd 2 Fe 3 Si 5 , the large linear term has been suggested to be due to a two-dimensional ferromagnetic spin waves ͑where the magnon dispersion relation is proportional to q 2 , where q is the wave vector͒ or from onedimensional antiferromagnetic spin waves ͑where the magnon dispersion relation is proportional to q). 15 Tsay et al 26 and Lai et al 27 have explained the observation of a hump in the heat capacity of several Gd-based antiferromagnetic oxide compounds, on the basis of the model proposed by Fishman and Liu.…”

Section: Resultsmentioning

confidence: 99%

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

et al. 1999
Phys. Rev. B
19
0
4
0
View full text Add to dashboard Cite

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

show abstract

Specific heat in some gadolinium compounds. I. Experimental

Cited by 333 publications

References 17 publications

Magnetic susceptibility and heat capacity investigations of the unconventional spin-chain compoundSr3CuPtO6

Magnetic susceptibility and heat capacity investigations of the unconventional spin-chain compoundSr3CuPtO6

Effect of Ge substitution for Si on the anomalous magnetocaloric and magnetoresistance properties of GdMn2Si2 compounds

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

et al. 1999
Phys. Rev. B
19
0
4
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Specific heat in some gadolinium compounds. I. Experimental

Cited by 333 publications

References 17 publications

Magnetic susceptibility and heat capacity investigations of the unconventional spin-chain compoundSr3CuPtO6

Magnetic susceptibility and heat capacity investigations of the unconventional spin-chain compoundSr3CuPtO6

Effect of Ge substitution for Si on the anomalous magnetocaloric and magnetoresistance properties of GdMn2Si2 compounds

Low-temperature heat-capacity studies ofR2Ni3Si5Mazumdar1, Ghosh2, Nagarajan3 et al. 1999Phys. Rev. B19040View full textAdd to dashboardCite

Contact Info

Product

Resources

About

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

et al. 1999
Phys. Rev. B
19
0
4
0
View full text Add to dashboard Cite