| Records |
Author  |
Betancourth, D.; Facio, J.I.; Pedrazzini, P.; Jesus, C.B.R.; Pagliuso, P.G.; Vildosola, V.; Cornaglia, P.S.; García, D. J.; Correa, V. F. |
| Title |
Low Temperature magnetic properties of GdCoIn5 |
Type |
Journal Article |
| Year |
2015 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
| Volume |
374 |
Issue |
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Pages |
744-747 |
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| Abstract |
A comprehensive experimental and theoretical study of the low temperature properties of GdCoIn5 was performed. Specific heat, thermal expansion, magnetization and electrical resistivity were measured in good quality single crystals down to 4He temperatures. All the experiments show a second-order-like phase transition at 30 K probably associated with the onset of antiferromagnetic order. The magnetic susceptibility shows a pronounced anisotropy below T N with an easy magnetic axis perpendicular to the crystallographic ĉ-axis. Total energy GGA+U calculations indicate a ground state with magnetic moments localized at the Gd ions and allowed a determination of the Gd-Gd magnetic interactions. Band structure calculations of the electron and phonon contributions to the specific heat together with Quantum Monte Carlo calculations of the magnetic contributions show a very good agreement with the experimental data. Comparison between experiment and calculations suggests a significant anharmonic contribution to the specific heat at high temperature (View the MathML sourceT≳100K). |
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BT @ victor.correa @ |
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701 |
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Braghta, A.; Schmerber, G.; Derory, A.; Sereni, J.G.; Kappler, J.P. |
| Title |
Magnetic and thermal properties of Ce2Pd2Sn |
Type |
Journal Article |
| Year |
2008 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
| Volume |
320 |
Issue |
6 |
Pages |
1141-1145 |
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X-ray diffraction, susceptibility and specific heat studies on ternary Ce2Pd2Sn intermetallic compound and on its isostructural nonmagnetic compound La2Pd2Sn are reported. On Ce2Pd2Sn in absence of magnetic field, we confirm the existence of two magnetic transitions at T-N = 4.8K (antiferromagnetic transition) and T-C = 2.2K (ferromagnetic transition) and the specific heat results, measured down to 0.5 K, allow to recognize the transition at 2.2K as a first-order transition. A description based on molecular field calculations for the S = 1/2 resonant level model leads to a characteristic Kondo T-K of about 3K. (C) 2007 Elsevier B.V. All rights reserved. |
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0304-8853 |
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ISI:000254416300060 |
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BT @ hernan @ |
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49 |
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Facio, J.I.; Betancourth, D.; Cejas Bolecek, N.R.; Jorge, G.A.; Pedrazzini, P.; Correa, V.F.; Cornaglia, P.S.; Vildosola, V.; García D.J. |
| Title |
Lattice specific heat for the RMIn5 (R=Gd, La,Y; M=Co, Rh) compounds: Non-magnetic contribution subtraction |
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Journal Article |
| Year |
2016 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
| Volume |
407 |
Issue |
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406-4011 |
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BT @ victor.correa @ |
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730 |
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Fraga, G.L.F.; Brandao, D.E.; Sereni, J.G. |
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Specific heat of X2MnSn (X = Co, Ni, Pd, Cu), X2MnIn (X = Ni, Pd) and Ni2MnSb Heusler compounds |
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Journal Article |
| Year |
1991 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
| Volume |
102 |
Issue |
1-2 |
Pages |
199-207 |
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Results of low-temperature specific heat measurements (1.5-8.0 K) on X2MnSn (X = Co, Ni, Pd, Cu), X2Mnln (X = Ni, Pd) and Ni2MnSb Heusler compounds are presented. All the compounds, except the cobalt based one, exibit a lattice spectrum anomaly described by an Einstein's term (soft-phonons). For all but one compound, the experimental values of the electronic specific heat coefficients are, at least, twice as big as the theoretical estimates. For two compounds it was possible to determine the magnetic effective field on Mn nuclei. |
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0304-8853 |
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ISI:A1991GX03900034 |
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no |
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BT @ hernan @ |
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117 |
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Franco, D.G.; Carbonio, R.E.; Kaul, E.E.; Nieva, G. |
| Title |
Tailoring the ground state of the ferrimagnet La2Ni(Ni1/3Sb2/3)O6 |
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Journal Article |
| Year |
2013 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
| Volume |
346 |
Issue |
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Pages |
196-202 |
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Ferrimagnetic; Double perovskite; Magnetic frustration; Superexchange and super-superexchange interaction; Magnetic oxide |
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We report on the magnetic and structural properties of La2Ni(Ni1/3Sb2/3)O6 in polycrystal, single crystal and thin film samples. We found that this material is a ferrimagnet ( T c ≈ 100 K ) which possesses a very distinctive and uncommon feature in its virgin curve of the hysteresis loops. We observe that bellow 20 K it lies outside the hysteresis cycle, and this feature was found to be an indication of a microscopically irreversible process possibly involving the interplay of competing antiferromagnetic interactions that hinder the initial movement of domain walls. This initial magnetic state is overcome by applying a temperature dependent characteristic field. Above this field, an isothermal magnetic demagnetization of the samples yield a ground state different from the initial thermally demagnetized one. |
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0304-8853 |
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no |
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BT @ pedrazp @ |
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666 |
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Kappler, J.P.; Schmerber, G.; Sereni, J.G. |
| Title |
Magnetic and thermal properties of Ce5Rh3 |
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Journal Article |
| Year |
1992 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
| Volume |
115 |
Issue |
2-3 |
Pages |
241-244 |
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Magnetic susceptibility, high field magnetization and specific heat measurements on Ce5Rh3 are reported. Two antiferromagnetic transitions are observed at T(N)=4.5 K and T(N)'=2.6 K. The magnetization curve at 1.5 K reveals a nontrivial magnetic structure in this compound, with a saturation magnetization of 0.72mu(B). The high temperature Curie constant (0.64 emu K/mol), the Curie-Weiss constant (THETA(p)=-45 K) and the entropy related with the magnetic transitions (DELTAS(m)=0.8 R In 2) indicate the presence of a Kondo-type component in the ground state of Ce5Rh3. |
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0304-8853 |
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ISI:A1992JV02200022 |
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BT @ hernan @ |
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111 |
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KAPPLER, J.P.; SCHMERBER, G.; SERENI, J.G. |
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CERIUM MAGNETIC-BEHAVIOR IN CE(PD,M) WITH M = CO, NI, RH, IR, PT, CU, AG AND AU |
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Journal Article |
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1988 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
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76-7 |
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185-186 |
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0304-8853 |
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ISI:A1988T046300057 |
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no |
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BT @ hernan @ |
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124 |
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Pureur, P.; Fraga, G. L.; Brandao, D. E.; Caudron,R.; Safa, H.; Nieva, G. |
| Title |
Specific heat measurements in scandium-rare earth anisotropic spin glasses |
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Journal Article |
| Year |
1987 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
| Volume |
68 |
Issue |
2 |
Pages |
213-217 |
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We report on specific heat measurements at low temperature of the anisotropic spin glass alloys ScDy 3 at%, ScEr 4.25 at% and ScEr 10 at%. We find that at the lowest temperature range the data indicate the occurrence of an anisotropy induced gap around zero frequency in the density of states of the magnetic excitations. Moreover, some of our specific heat curves present a maximum coinciding with Tg, raising thus the question of thermal signs for a spin glass phase transition in anisotropic systems. |
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BT @ gnieva @ |
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425 |
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Pureur, P.; Sereni, J.G.; Schaf, J. |
| Title |
Specific heat and magnetic susceptibility in YNd alloys |
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Journal Article |
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1992 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
| Volume |
104 |
Issue |
3 |
Pages |
1632-1634 |
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We report on the specific heat and dc magnetic susceptibility measurements of the YNd 4.5, 6.8 and 9.0 at % alloys. These systems present long-range SDW order just below the critical temperature. For temperatures well below T(C), the spin glass type of behavior is manifest. An interpretation is given in terms of a disorder- and frustration-induced breaking of the SDW coherence into small domains. |
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0304-8853 |
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ISI:A1992HH32800067 |
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no |
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BT @ hernan @ |
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115 |
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SERENI, J.G. |
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The role of “p-like†orbitals in Ce valence instabilities |
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Journal Article |
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1985 |
Publication |
Journal of Magnetism and Magnetic Materials |
Abbreviated Journal |
J. Magn. Magn. Mater. |
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47-48 |
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FEB |
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228-230 |
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From the analysis of spectroscopical data of atomic Ce, the [f(dsp)] configuration is found to be the least energetic when the metallization enthalpy is taken into account. The p-character of the band in Ce IV compounds is discussed and the p-f hybridization proposed. |
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0304-8853 |
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ISI:A1985AKL5200061 |
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BT @ hernan @ |
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131 |
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