Gradual pressure induced enhancement of magnon excitations in CeCoSi
| Autor: | J. Kwon, Andrey Podlesnyak, D. G. Franco, R. I. Bewley, S. E. Nikitin, Michael Marek Koza, Andreas Hoser, Oliver Stockert, C. Geibel |
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| Rok vydání: | 2020 |
| Předmět: |
Hydrostatic pressure
SPIN DYNAMICS FOS: Physical sciences Hydraulics Large scale facilities for research with photons neutrons and ions 02 engineering and technology Neutron scattering 01 natural sciences Heat capacity Inelastic neutron scattering purl.org/becyt/ford/1 [https] Condensed Matter - Strongly Correlated Electrons HEAVY FERMION SYSTEMS 0103 physical sciences Antiferromagnetism 010306 general physics ANTIFERROMAGNETS Phase diagram Physics Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Magnon Transition temperature purl.org/becyt/ford/1.3 [https] 021001 nanoscience & nanotechnology Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Energy (signal processing) |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET 'Physical Review B ', vol: 101, pages: 214426-1-214426-11 (2020) |
| Popis: | CeCoSi is an intermetallic antiferromagnet with a very unusual temperature-pressure phase diagram: at ambient pressure it orders below $T_{\mathrm{N}} = 8.8$ K, while application of hydrostatic pressure induces a new magnetically ordered phase with exceptionally high transition temperature of $\sim40$ K at 1.5 GPa. We studied the magnetic properties and the pressure-induced magnetic phase of CeCoSi by means of elastic and inelastic neutron scattering (INS) and heat capacity measurements. At ambient pressure CeCoSi orders into a simple commensurate AFM structure with a reduced ordered moment of only $m_{\mathrm{Ce}} = 0.37(6)$ $\mu_{\mathrm{B}}$. Specific heat and low-energy INS indicate a significant gap in the low-energy magnon excitation spectrum in the antiferromagnetic phase, with the CEF excitations located above 10 meV. Hydrostatic pressure gradually shifts the energy of the magnon band towards higher energies, and the temperature dependence of the magnons measured at 1.5 GPa is consistent with the phase diagram. Moreover, the CEF excitations are also drastically modified under pressure. Comment: 8 pages, 11 figures |
| Databáze: | OpenAIRE |
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