Pregled bibliografske jedinice broj: 1271542
NMR and ESR: interplay between orbital and spin degrees of freedom in rare‐earth titanates
NMR and ESR: interplay between orbital and spin degrees of freedom in rare‐earth titanates // Abstract book of the Young researchers online workshop on Topology and Superconductivity in Strongly Correlated f‐ electron Materials
online, 2023. str. 52-52 (pozvano predavanje, nije recenziran, sažetak, znanstveni)
CROSBI ID: 1271542 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
NMR and ESR: interplay between orbital and spin
degrees of freedom in rare‐earth titanates
Autori
Najev, Ana ; Hameed, Sajna ; Alfonsov, Alexey ; Joe, Joseph ; Kataev, Vladislav ; Greven, Martin ; Požek, Miroslav ; Pelc, Damjan
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Abstract book of the Young researchers online workshop on Topology and Superconductivity in Strongly Correlated f‐ electron Materials
/ - , 2023, 52-52
Skup
Young researchers online workshop on Topology and Superconductivity in Strongly Correlated f‐electron Materials
Mjesto i datum
Online, 27.02.2023. - 01.03.2023
Vrsta sudjelovanja
Pozvano predavanje
Vrsta recenzije
Nije recenziran
Ključne riječi
NMR ; ESR ; titanati rijetkih zemalja ; magnetizm
(NMR ; ESR ; rare-earth titanates ; magnetizm)
Sažetak
Trivalent rare‐earth titanates exhibit an interesting interplay between spin, orbital and lattice degrees of freedom. Their magnetic ground state is defined by subtle lattice distortions which can be easily manipulated through chemical substitution or external stain. We will be presenting our magnetic resonance study on single‐ crystalline samples of Y(La, Ca)TiO3 in a wide range of isovalent substitution (La) and hole doping (Ca). The aim of our investigation was to elucidate the commonly ignored paramagnetic regime by utilizing nuclear magnetic resonance (NMR) and electron spin resonance (ESR). Anomalous behaviours have been detected at temperatures well above the Curie temperature (TC) in the stoichiometric compound YTiO3. Furthermore, the nature of the orbital state within these compounds is still not well understood. In our experiments, ESR of the unpaired Ti electron shows broad resonance lines at all temperatures and substitution/doping levels. We find that short electronic spin‐lattice relaxation times cause this. By modeling the relaxation as an Orbach process we were able to extract a small energy gap, likely produced by Jahn‐Teller splitting of the two lower Ti t2g orbitals. The value of the gap closely follows TC which indicates that full orbital degeneracy lifting is associated with ferromagnetic order. NMR was conducted on a spin‐1/2 89Y nucleus. Our results demonstrate a clear discrepancy between the static and dynamic local magnetic susceptibilities, with deviations from Curie‐Weiss behavior far above TC.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
POVEZANOST RADA
Projekti:
Ostalo-3.4-1022249-HRV-IP - Interplay of structure, spin, and orbital order in perovskite cuprates and titanates (INSPINOR) (Požek, Miroslav, Ostalo - Research Group Linkage Programme) ( CroRIS)
HRZZ-IP-2018-01-2970 - Mikroskopska istraživanja induciranih faza u jako koreliranim elektronskim sustavima (MicroS) (Požek, Miroslav, HRZZ - 2018-01) ( CroRIS)
Ustanove:
Prirodoslovno-matematički fakultet, Zagreb
