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Author  |
García, D.J.; Franco, D.G.; Cornaglia, P.S. | ||||
| Title | Large magnetocaloric effect in the frustrated antiferromagnet EuIr2P2 | Type | Journal Article | ||
| Year | 2023 | Publication | Journal of Magnetism and Magnetic Materials | Abbreviated Journal | J. Magn. Magn. Mater. |
| Volume | 565 | Issue | Pages | 170307 | |
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| Abstract | We present a theoretical analysis of the magnetocaloric effect in the frustrated antiferromagnet EuIrP. Monte Carlo simulations indicate a large magnetic entropy change J kg−1 K−1 at K for a moderate change in the external magnetic field Tesla. The highest value of seems to be associated with the presence of a multicritical point in the magnetic field versus temperature phase diagram (at Tesla and K) but it persists with similar large values for a broad range of temperatures . Single crystal EuIrP magnetization vs magnetic field experiments allowed us to obtain the magnetocaloric effect for K. The results are consistent with the theoretical analysis and show a large magnetocaloric effect for K. Finally, we present a phenomenological Landau functional analysis that provides a simplified description of the phase diagram and of the magnetocaloric effect. Although the magnetic frustration in this system leads to a rich phase diagram, we found no clear indication that it plays a significant role enhancing the magneticaloric effect, other than by reducing the transition temperatures and fields. | ||||
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| ISSN | 0304-8853 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | BT @ pedrazp @ | Serial | 897 | ||
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| Author |
Carreras Oropesa, W.G.; Correa, V.F.; Sereni, J.G.; García, D.J.; Cornaglia, P.S. | ||||
| Title | Landau theory for magnetic and structural transitions in CeCo0.85Fe0.15Si | Type | Journal Article | ||
| Year | 2018 | Publication | Journal of Physics: Condensed Matter | Abbreviated Journal | J. Phys.: Condens. Matter |
| Volume | 30 | Issue | Pages | 295803 | |
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| Abstract | We present a phenomenological analysis of the magnetoelastic properties of CeCo0.85Fe0.15Si at temperatures close to the Néel transition temperature TN. Using a Landau functional we provide a qualitative description of the thermal expansion, magnetostriction, magnetization and specific heat data. We show that the available experimental results (Correa et al 2016 J. Phys.: Condens. Matter 28 346003) are consistent with the presence of a structural transition at Ts TN and a strong magnetoelastic coupling. The magnetoelastic coupling presents a Janus-faced effect: while the structural transition is shifted to higher temperatures as the magnetic field is increased, the resulting striction at low temperatures decreases. The strong magnetoelastic coupling and the proximity of the structural transition to the onset temperature for magnetic fluctuations, suggest that the transition could be an analogue of the tetragonal to orthorhombic observed in Fe-based pcnictides. |
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| Notes | Approved | no | |||
| Call Number | BT @ victor.correa @ | Serial | 796 | ||
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| Author |
Betancourth, D.; Correa, V.F.; García, D.J. | ||||
| Title | Evidence of a Low Energy Anisotropy in GdCoIn_5 | Type | Journal Article | ||
| Year | 2015 | Publication | Journal of Low Temperature Physics | Abbreviated Journal | J. Low Temp. Phys. |
| Volume | 179 | Issue | 1-2 | Pages | 90-93 |
| Keywords | Rare earth magnetism; Antiferromagnetic transition; Anisotropy | ||||
| Abstract | We investigate the effects of an applied magnetic field on the magnetic properties of the antiferromagnet GdCoIn 5 . The prominent anisotropy observed in the susceptibility below TN is rapidly suppressed by a field of just a few Tesla. Further evidence of this low energy-scale is obtained from magnetoresistance and magnetostriction experiments. The lattice length, particularly, shows a sudden change below 2 T when the magnetic field is applied perpendicular to the crystallographic c^ -axis. | ||||
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| Publisher | Springer US | Place of Publication | Editor | ||
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| ISSN | 0022-2291 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | BT @ pedrazp @ | Serial | 710 | ||
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