Valence Band of Ce_2Co_{0.8}Si_{3.2} and Ce_2RhSi_3 Studied by Resonant Photoemission Spectroscopy and FPLO Calculations

• Authors: P. Starowicz , R. Kurleto , J. Goraus , Ł. Walczak , B. Penc , J. Adell , M. Szlawska , D. Kaczorowski , A. Szytuła
• Languages of publication: EN

Abstracts

EN

This work presents studies of the valence band of two Kondo lattice systems: Ce_2Co_{0.8}Si_{3.2}, which is paramagnetic with the Kondo temperature T_{K} ≈50 K and Ce_2RhSi_3, which is antiferromagnetic below T_{N}=4.5 K and exhibits T_{K} ≈9 K. The photoemission spectra, which are obtained with photon energy tuned to Ce 4d-4f resonance, reveal a Kondo peak at the Fermi energy (E_{F}), its spin-orbit splitting partner at 0.24 eV and a broad maximum related to Ce f^0 final state. The spectra indicate that Kondo peak has a higher intensity for Ce_2Co_{0.8}Si_{3.2}. The off-resonance photoemission data reveal that a maximum in the 3d electron density of states is shifted towards E_{F} for Ce_2Co_{0.8}Si_{3.2} as compared to Ce_2RhSi_3. Full-potential local-orbital calculations were realized with local spin density approach +U approach for 213 stoichiometry. They show that a higher density of states near E_{F} is observed for Ce_2CoSi_3. The calculations also reveal the existing tendencies for antiferromagnetic and ferromagnetic ground states in a case of Ce_2RhSi_3 and Ce_2CoSi_3, respectively.

Keywords

EN

71.27.+a; 75.30.Mb; 71.20.Eh; 74.25.Jb

Discipline

• 71.20.Eh: Rare earth metals and alloys
• 74.25.Jb: Electronic structure (photoemission, etc.)
• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 75.30.Mb: Valence fluctuation, Kondo lattice, and heavy-fermion phenomena(see also 71.27.+a Strongly correlated electron systems, heavy fermions; for heavy-fermion superconductors, see 74.70.Tx)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 4a
• Pages: A-144-A-148

Dates

published

2014-10

Contributors

author

P. Starowicz

• M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland

author

R. Kurleto

• M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland

author

J. Goraus

• Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland

author

Ł. Walczak

• M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
• Depto. de Fisica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain

author

B. Penc

• M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland

author

J. Adell

• MAX-Lab, Lund University, 221 00 Lund, Sweden

author

M. Szlawska

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-950 Wrocław, Poland

author

D. Kaczorowski

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-950 Wrocław, Poland

author

A. Szytuła

• M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland

References

• [1] Valence Instabilities and Related Narrow Band Phenomena, Ed. R.D. Parks, Plenum Press, New York 1977
• [2] S. Sachdev, Quantum Phase Transitions, Cambridge Univ. Press, Cambridge 1999
• [3] M. Szlawska, D. Kaczorowski, A. Ślebarski, L. Gulay, J. Stępień-Damm, Phys. Rev. B 79, 134435 (2009), doi: 10.1103/PhysRevB.79.134435
• [4] M. Szlawska, D. Kaczorowski,J. Phys. Condens. Matter 26, 016004 (2014), doi: 10.1088/0953-8984/26/1/016004
• [5] S. Patil, K.K. Iyer, K. Maiti, E.V. Sampathkumaran, Phys. Rev. B 77, 094443 (2008), doi: 10.1103/PhysRevB.77.094443
• [6] M. Szlawska, D. Kaczorowski, J. Phys. Condens. Matter 25, 255601 (2013), doi: 10.1088/0953-8984/25/25/255601
• [7] S. Patil, V.R.R. Medicherla, R.S. Singh, S.K. Pandey, E.V. Sampathkumaran, K. Maiti, Phys. Rev. B 82, 104428 (2010), doi: 10.1103/PhysRevB.82.104428
• [8] S. Patil, S.K. Pandey, V.R.R. Medicherla, R.S. Singh, R. Bindu, E.V. Sampathkumaran, K. Maiti, J. Phys. Condens. Matter 22, 255602 (2010), doi: 10.1088/0953-8984/22/25/255602
• [9] S. Patil, V.R.R. Medicherla, R.S. Singh, E.V. Sampathkumaran, K. Maiti, Europhys. Lett. 97, 17004 (2012), doi: 10.1209/0295-5075/97/17004
• [10] P. Starowicz, R. Kurleto, J. Goraus, H. Schwab, M. Szlawska, F. Forster, A. Szytuła, I. Vobornik, D. Kaczorowski, F. Reinert, Phys. Rev. B 89, 115122 (2014), doi: 10.1103/PhysRevB.89.115122
• [11] B.N. Jensen, S.M. Butorin, T. Kaurila, R. Nyholm, L.I. Johansson, Nucl. Instrum. Methods Phys. Res. A 394, 243 (1997), doi: 10.1016/S0168-9002(97)00595-0
• [12] K. Koepernik, H. Eschrig, Phys. Rev. B 59, 1743 (1999), doi: 10.1103/PhysRevB.59.1743
• [12a] I. Opahle, K. Koepernik, H. Eschrig, Phys. Rev.B 60, 14035 (1999), doi: 10.1103/PhysRevB.60.14035
• [13] J.P. Perdew, Y. Wang, Phys. Rev. B 45, 13244 (1992), doi: 10.1103/PhysRevB.45.13244
• [13a] D.M. Ceperley, B.J. Alder, Phys. Rev. Lett. 45, 566 (1980), doi: 10.1103/PhysRevLett.45.566
• [14] V.I. Anisimov, I.V. Solovyev, M.A. Korotin, M.T. Czyżyk, G.A. Sawatzky, Phys. Rev. B 48, 16929 (1993), doi: 10.1103/PhysRevB.48.16929
• [15] J. Leciejewicz, N. Stüsser, A. Szytuła, A. Zygmunt, J. Magn. Magn. Mater. 147, 45 (1995), doi: 10.1016/0304-8853(94)01702-6

Identifiers

DOI

10.12693/APhysPolA.126.A-144