Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Correlated Electrons: Quantum-Critical Phenomena - Experiment
TT 28.4: Vortrag
Dienstag, 8. März 2016, 10:45–11:00, H21
Quantum oscillation measurements of β-LuAlB4 — Pascal Reiss1, •Jordan Baglo1, Xiaoye Chen1, HongEn Tan1, Michael Sutherland1, Sven Friedemann2, Swee K. Goh3, Kentaro Kuga4, Hisatomo Harima5, Satoru Nakatsuji4, and F. Malte Grosche1 — 1Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom — 2HH Wills Laboratory, University of Bristol, Bristol, United Kingdom — 3Chinese University of Hong Kong, Shatin, N.T., Hong Kong — 4Institute for Solid State Physics, University of Tokyo, Kashiwa, Japan — 5Department of Physics, Graduate School of Science, Kobe University, Kobe, Japan
The Yb-based heavy fermion superconductor β-YbAlB4 displays a quantum critical point without tuning by applied pressure, magnetic field, or doping, which has been attributed to an unusual renormalised band structure [1]. Quantum oscillation measurements of the Fermi surface in β-YbAlB4 have so far proved inconclusive, motivating us to undertake a detailed study of the isostructural reference compound β-LuAlB4, which in contrast to the Yb compound is characterised by a filled 4f shell. We present comprehensive results from rotation and mass studies in β-LuAlB4, which broadly agree with band structure calculations and display moderate mass enhancements contrasting with the much larger enhancements seen in β-YbAlB4 – further emphasising the important contribution of f electrons to the itinerant electron physics of β-YbAlB4.
A. Ramires et al., PRL 109, 176404 (2012).