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  Valence fluctuation and magnetic ordering in EuNi2(P1-xGex)2 single crystals

Paramanik, U. B., Bar, A., Das, D., Caroca-Canales, N., Prasad, R., Geibel, C., et al. (2016). Valence fluctuation and magnetic ordering in EuNi2(P1-xGex)2 single crystals. Journal of Physics: Condensed Matter, 28(16): 166001, pp. 1-7. doi:10.1088/0953-8984/28/16/166001.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-5226-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-08E6-3
Genre: Journal Article

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Paramanik, U. B.1, Author
Bar, A.1, Author
Das, Debarchan1, Author
Caroca-Canales, N.1, Author
Prasad, R.1, Author
Geibel, C.2, Author              
Hossain, Z.3, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
3Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: Unusual phases and phase transitions are seen at the magnetic-nonmagnetic boundary in Ce-, Eu- and Yb-based compounds. EuNi2P2 is a very unusual valence fluctuating Eu system, because at low temperatures the Eu valence stays close to 2.5 instead of approaching an integer value. The Eu valence, and thus the magnetic property in this system, can be tuned by Ge substitution in the P site as EuNi2Ge2 is known to exhibit the antiferromagnetc (AFM) ordering of divalent Eu moments with T-N = 30 K. We have grown EuNi2(P1-xGex)(2) (0.0 <= x <= 0.5) single crystals and studied their magnetic, thermodynamic and transport properties. Increasing Ge doping to x > 0.4 results in a well-defined AFM ordered state with T-N = 12 K for x = 0.5. Moreover, the reduced value of magnetic entropy for x = 0.5 at T-N suggests the presence of valance fluctuation/the Kondo effect in this compound. Interestingly, the specific heat exhibits an enhanced Sommerfeld coefficient upon Ge doping. Subsequently, electronic structure calculations lead to a non-integral valence in EuNi2P2 but a stable divalent Eu state in EuNi2Ge2, which is in good agreement with the experimental results.

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Language(s): eng - English
 Dates: 2016-03-182016-03-18
 Publication Status: Published in print
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Title: Journal of Physics: Condensed Matter
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 28 (16) Sequence Number: 166001 Start / End Page: 1 - 7 Identifier: ISSN: 0953-8984
CoNE: https://pure.mpg.de/cone/journals/resource/954928562478