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Title: Electronic structure of the quadrupolar ordered heavy-fermion compound YbRu 2 Ge 2 measured by angle-resolved photoemission

Abstract

We studied the electronic structure of the heavy-fermion compound Yb(Ru1–xRhx)2Ge2 with x = 0 and nominally x = 0.125 using ARPES and LDA calculations. We find a valence band structure of Yb corresponding to a noninteger valence close to 3+. The three observed crystal electric field levels with a splitting of 32 and 75 meV confirm the suggested configuration with a quasiquartet ground state. The experimentally determined band structure of the conduction electrons with predominantly Ru 4d character is well reproduced by our calculations. YbRu2Ge2 undergoes a nonmagnetic phase transition into a ferroquadrupolar ordered state below 10.2 K and then to an antiferromagnetically ordered state below 6.5 K. A small hole Fermi surface shows nesting features in our calculated band structure and its size determined by ARPES is close to the magnetic ordering wave vector found in neutron scattering. The transitions are suppressed when YbRu2Ge2 is doped with 12.5% Rh. In conclusion, the electron doping leads to a shift of the band structure and successive Lifshitz transitions.

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [1];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1497702
Alternate Identifier(s):
OSTI ID: 1546171
Grant/Contract Number:  
GBMF4414; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 7; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Pfau, H., Rosenberg, E. W., Massat, P., Moritz, B., Hashimoto, M., Lu, D., Fisher, I. R., and Shen, Z. -X. Electronic structure of the quadrupolar ordered heavy-fermion compound YbRu2Ge2 measured by angle-resolved photoemission. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.075159.
Pfau, H., Rosenberg, E. W., Massat, P., Moritz, B., Hashimoto, M., Lu, D., Fisher, I. R., & Shen, Z. -X. Electronic structure of the quadrupolar ordered heavy-fermion compound YbRu2Ge2 measured by angle-resolved photoemission. United States. doi:10.1103/PhysRevB.99.075159.
Pfau, H., Rosenberg, E. W., Massat, P., Moritz, B., Hashimoto, M., Lu, D., Fisher, I. R., and Shen, Z. -X. Fri . "Electronic structure of the quadrupolar ordered heavy-fermion compound YbRu2Ge2 measured by angle-resolved photoemission". United States. doi:10.1103/PhysRevB.99.075159. https://www.osti.gov/servlets/purl/1497702.
@article{osti_1497702,
title = {Electronic structure of the quadrupolar ordered heavy-fermion compound YbRu2Ge2 measured by angle-resolved photoemission},
author = {Pfau, H. and Rosenberg, E. W. and Massat, P. and Moritz, B. and Hashimoto, M. and Lu, D. and Fisher, I. R. and Shen, Z. -X.},
abstractNote = {We studied the electronic structure of the heavy-fermion compound Yb(Ru1–xRhx)2Ge2 with x = 0 and nominally x = 0.125 using ARPES and LDA calculations. We find a valence band structure of Yb corresponding to a noninteger valence close to 3+. The three observed crystal electric field levels with a splitting of 32 and 75 meV confirm the suggested configuration with a quasiquartet ground state. The experimentally determined band structure of the conduction electrons with predominantly Ru 4d character is well reproduced by our calculations. YbRu2Ge2 undergoes a nonmagnetic phase transition into a ferroquadrupolar ordered state below 10.2 K and then to an antiferromagnetically ordered state below 6.5 K. A small hole Fermi surface shows nesting features in our calculated band structure and its size determined by ARPES is close to the magnetic ordering wave vector found in neutron scattering. The transitions are suppressed when YbRu2Ge2 is doped with 12.5% Rh. In conclusion, the electron doping leads to a shift of the band structure and successive Lifshitz transitions.},
doi = {10.1103/PhysRevB.99.075159},
journal = {Physical Review B},
number = 7,
volume = 99,
place = {United States},
year = {2019},
month = {2}
}

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