Electronic structure of the quadrupolar ordered heavy-fermion compound YbRu2Ge2 measured by angle-resolved photoemission

Pfau, H.; Rosenberg, E. W.; Massat, P.; Moritz, B.; Hashimoto, M.; Lu, D.; Fisher, I. R.; Shen, Z. -X.

doi:10.1103/PhysRevB.99.075159

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

Journal Article · 15 February 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.99.075159 · OSTI ID:1497702

Pfau, H. ^[1]; Rosenberg, E. W. ^[1]; Massat, P. ^[1]; Moritz, B. ^[2]; Hashimoto, M. ^[2]; Lu, D. ^[2]; Fisher, I. R. ^[1]; Shen, Z. -X. ^[1]

SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

We studied the electronic structure of the heavy-fermion compound Yb(Ru_1–xRh_x)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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: GBMF4414; AC02-76SF00515

OSTI ID:: 1497702

Alternate ID(s):: OSTI ID: 1546171

Journal Information:: Physical Review B, Vol. 99, Issue 7; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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