English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Charge, lattice and magnetism across the valence crossover in Eulr2Si2 single crystals

Seiro, S., Prots, Y., Kummer, K., Rosner, H., Cardoso Gill, R., & Geibel, C. (2019). Charge, lattice and magnetism across the valence crossover in Eulr2Si2 single crystals. Journal of Physics: Condensed Matter, 31(30): 305602, pp. 1-7. doi:10.1088/1361-648X/ab1509.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0003-B23E-F Version Permalink: http://hdl.handle.net/21.11116/0000-0003-B240-B
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Seiro, Silvia1, Author              
Prots, Yurii2, Author              
Kummer, Kurt3, Author
Rosner, Helge4, Author              
Cardoso Gill, Raúl5, Author              
Geibel, Christoph6, Author              
Affiliations:
1Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863473              
2Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863424              
3External Organizations, ou_persistent22              
4Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
5Raul Cardoso, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863420              
6Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

Content

show
hide
Free keywords: -
 Abstract: We present a detailed study of the temperature evolution of the crystal structure, specific heat, magnetic susceptibility and resistivity of single crystals of the paradigmatic valence fluctuating compound EuIr2Si2. A comparison to stable-valent isostructural compounds EuCo2Si2 (with Eu3+), and EuRh2Si2, (with Eu2+) reveals an anomalously large thermal expansion indicative of the lattice softening associated to valence fluctuations. A marked broad peak at temperatures around 65-75 K is observed in specific heat, susceptibility and the derivative of resistivity, as thermal energy becomes large enough to excite Eu into a divalent state, which localizes one f electron and increases scattering of conduction electrons. In addition, the intermediate valence at low temperatures manifests in a moderately renormalized electron mass, with enhanced values of the Sommerfeld coefficient in the specific heat and a Fermi-liquid-like dependence of resistivity at low temperatures. The high residual magnetic susceptibility is mainly ascribed to a Van Vleck contribution. Although the intermediate/ fluctuating valence duality is to some extent represented in the interconfiguration fluctuation model commonly used to analyze data on valence-fluctuating systems, we show that this model cannot describe the different physical properties of EuIr2Si2 with a single set of parameters.

Details

show
hide
Language(s): eng - English
 Dates: 2019-05-132019-05-13
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000467823800002
DOI: 10.1088/1361-648X/ab1509
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Physics: Condensed Matter
  Abbreviation : J. Phys. Condens. Matter.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 31 (30) Sequence Number: 305602 Start / End Page: 1 - 7 Identifier: ISSN: 0953-8984
CoNE: https://pure.mpg.de/cone/journals/resource/954928562478