Journal Article

PreJuSER-20186

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ferromagnetic transition and specific heat of Pr(0.6)Sr(0.4)MnO(3)

Rossler, S. ; Nair, H. S.FZJ* ; Rossler, U. K. ; Kumar, C. M. N.FZJ* ; Elizabeth, S. ; Wirth, S.

2011
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10870  doi:10.1103/PhysRevB.84.184422

Abstract: The critical properties of orthorhombic Pr0.6Sr0.4MnO3 single crystals were investigated by a series of static magnetization measurements along the three different crystallographic axes as well as by specific heat measurements. A careful range-of-fitting-analysis of the magnetization and susceptibility data obtained from the modified Arrott plots shows that Pr0.6Sr0.4MnO3 has a very narrow critical regime. Nevertheless, the system belongs to the three-dimensional (3D) Heisenberg universality class with short-range exchange. The critical exponents obey Widom scaling and are in excellent agreement with the single scaling equation of state M(H,epsilon) = vertical bar epsilon vertical bar(beta) f(+/-)(H/vertical bar epsilon vertical bar((beta+gamma)); with f(+) for T > T-c and f(-) for T < T-c. A detailed analysis of the specific heat that account for all relevant contributions allows us to extract and analyze the contribution related to the magnetic phase transition. The specific heat indicates the presence of a linear electronic term at low temperatures and a prominent contribution from crystal field excitations of Pr. A comparison with data from literature for PrMnO3 shows that a Pr-Mn magnetic exchange is responsible for a sizable shift in the lowest lying excitation.

Keyword(s): Basic research (1st) ; Others (1st) ; Magnetism (2nd) ; J

Note: S.R. is thankful to A. Salazar for useful discussions. H.S.N. is grateful to the MPI CPfS for financial support and hospitality in Dresden. The authors thank the Department of Science and Technology, India for financial supports. This work is supported by DAAD-DST exchange program (Pojekt ID 50726385).

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Contributing Institute(s):

1. Streumethoden (PGI-4)
2. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
3. Streumethoden (JCNS-2)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2011

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