About: Evidence for persistent spin fluctuations in uranium sesquicarbide

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Description	The low-temperature magnetic susceptibility, heat capacity, and electrical resistivity of uranium sesquicarbide have been determined down to 2 K by combining measurements carried out on samples of U2C3, containing UC as minority phase, and on pure UC specimens. The presence of spin fluctuations with characteristic temperature TSF = 7 K is revealed by a nonanalytic contribution to the specific heat behaving (well below TSF) as T3ln(T/TSF), and confirmed by a T2 increase of the electrical resistivity and a 1κT2 decrease of the low-temperature magnetic susceptibility. The zero-temperature many-body enhancement of the electron mass is found to be m/m 2.7. Our data rule out the occurrence of magnetic ordering in U2C3. First-principles electronic structure calculations support the absence of a magnetically ordered ground state but suggest that dynamical spin fluctuations are responsible for the electron mass enhancement. The low-temperature magnetic susceptibility, heat capacity, and electrical resistivity of uranium sesquicarbide have been determined down to 2 K by combining measurements carried out on samples of U2C3, containing UC as minority phase, and on pure UC specimens. The presence of spin fluctuations with characteristic temperature TSF = 7 K is revealed by a nonanalytic contribution to the specific heat behaving (well below TSF) as T3ln(T/TSF), and confirmed by a T2 increase of the electrical resistivity and a 1κT2 decrease of the low-temperature magnetic susceptibility. The zero-temperature many-body enhancement of the electron mass is found to be m/m 2.7. Our data rule out the occurrence of magnetic ordering in U2C3. First-principles electronic structure calculations support the absence of a magnetically ordered ground state but suggest that dynamical spin fluctuations are responsible for the electron mass enhancement. (en)
Title	Evidence for persistent spin fluctuations in uranium sesquicarbide Evidence for persistent spin fluctuations in uranium sesquicarbide (en)
skos:prefLabel	Evidence for persistent spin fluctuations in uranium sesquicarbide Evidence for persistent spin fluctuations in uranium sesquicarbide (en)
skos:notation	RIV/68378271:_____/13:00399801!RIV14-GA0-68378271
http://linked.open...avai/predkladatel	Fyzikální ústav AV ČR, v.v.i.
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP204/10/0330)
http://linked.open...iv/cisloPeriodika	21
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Shick, Alexander
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Fyzikální ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	73755
http://linked.open...ai/riv/idVysledku	RIV/68378271:_____/13:00399801
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	X-ray; magnetic susceptibility; scaling properties; carbides (en)
http://linked.open.../riv/klicoveSlovo	scaling properties X-ray carbides magnetic susceptibility
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[EDA4AF2FE63E]
http://linked.open...i/riv/nazevZdroje	Physical Review. B
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	Nanostructured actinide-based materials: Theory and experiment
http://linked.open...UplatneniVysledku	2013
http://linked.open...v/svazekPeriodika	87
http://linked.open...iv/tvurceVysledku	Colineau, E. Eloirdi, R. Shick, Alexander Caciuffo, R. Griveau, J. C. Fuchs, A. J. Manara, D.
http://linked.open...ain/vavai/riv/wos	000320307700002
issn	1098-0121
number of pages	9 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevB.87.214414

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