Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Correlated Electrons: Quantum-Critical Phenomena
TT 41.4: Vortrag
Mittwoch, 22. März 2017, 10:15–10:30, HSZ 204
Angle-dependent electron spin resonance measurements on YbRh2Si2 down to 1.6 K using superconducting planar resonators — •Linda Bondorf1, Manfred Beutel1, Markus Thiemann1, Kristin Kliemt2, Jörg Sichelschmidt3, Cornelius Krellner2, Martin Dressel1, and Marc Scheffler1 — 11. Physikalisches Institut, Universität Stuttgart, Germany — 2Goethe-Universität, Frankfurt am Main, Germany — 3Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
YbRh2Si2 is a tetragonal heavy-fermion system with strong magnetic anisotropy. Its antiferromagnetic order below 70 mK can be suppressed by an in-plane magnetic field of 60 mT, which leads to a quantum critical point. Experimental challenges, e.g. for neutron spectroscopy have so far prohibited a full understanding of the antiferromagnetism of YbRh2Si2. Here, angle-dependent electron spin resonance (ESR) could be an alternative method. However, conventional ESR spectrometers are limited in frequency (typically 9 GHz, corresponding to 200 mT for YbRh2Si2) and temperature (down to 2 K).
To overcome these limitations, we use superconducting planar microwave resonators, and we have performed angle-dependent ESR measurements with in-situ rotation of YbRh2Si2 single crystals inside a 4He cryostat down to 4.4 GHz and 1.6 K. We present the ESR g-factor as a function of angle, which is consistent with results of previous measurements at higher temperatures and frequencies. Angle-dependent ESR investigations inside the antiferromagnetic phase of YbRh2Si2 can now be addressed experimentally.