Electronic structure of UN based on specific heat and field-induced transitions up to 65 T

0469481 - FZÚ 2017 RIV US eng J - Článek v odborném periodiku
Troć, R. - Samsel-Czekała, M. - Pikul, A. - Andreev, Alexander V. - Gorbunov, Denis - Skourski, Y. - Sznajd, J.
Electronic structure of UN based on specific heat and field-induced transitions up to 65 T.
Physical Review B. Roč. 94, č. 22 (2016), 1-14, č. článku 224415. ISSN 2469-9950. E-ISSN 2469-9969
Grant CEP: GA ČR GA16-03593S
Institucionální podpora: RVO:68378271
Klíčová slova: uranium mononitride * antiferromagnetism * field-induced transition
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 3.836, rok: 2016

We studied specific heat and magnetization (up to 65 T) of single-crystalline UN. Analysis of the magnetic contribution to the specific heat of UN revealed that its real ground state is complex, the 5f electrons possess simultaneously local and itinerant characters. High-field experiments allowed us to construct a magnetic phase diagram of UN with a metamagnetic transition from antiferromagnetism to ferrimagnetism at high magnetic field up to 58 T at 2 K. Such a field only enables a reversing of one of the twelve antiferromagnetically coupled ferromagnetic layers into the direction of the field. The magnetic phase diagram can be successfully reproduced considering a layer model of the Ising spins. That model allows to estimate roughly a phase transition into fully induced ferromagnetism at about 258 T. It gives rise to a giant coupling between ferromagnetically ordered layers in UN.
Trvalý link: http://hdl.handle.net/11104/0267268