High-field magnetotransport in microstructures of the frustrated antiferromagnet Yb2Pt2Pb
- Max Planck Inst. for Chemical Physics, Dresden (Germany)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Frustrated quantum magnets exhibit a rich variety of non-trivial quantum ground states due to their remnant entropy at zero temperature. Most studied materials are insulators, with magnetic coupling of localized spins mediated by exchange interactions. Yb2Pt2Pb (YPP) is a rare example of a metallic frustrated quantum magnet, where Yb3+ J=7/2 moments are arranged in dimers forming a Shastry-Sutherland lattice. In addition, the itinerant charge carriers of the metal provide gapless excitations able to mediate magnetic interactions (RKKY) as well as hybridize with the 4f-states, which has been proposed to lead to a novel charge-orbital separation. YPP orders antiferromagnetically (AFM) below TN = 2.1 K, and strong g-factor anisotropy confines the spins into the ab planes. Accordingly, fields aligned parallel to the planes suppress the AFM order already below 4 T, while fields of up to 65 T along the c direction do not lead to saturation in the magnetization and step-like features even at B ~ 25 T were observed [4]. Here we probe the electronic structure of YPP by quantum oscillation and conductivity measurements in high fields, which tune the energy balance of the 4f states and thus the degree of charge-orbital separation.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1345960
- Report Number(s):
- LA-UR-17-21890
- Country of Publication:
- United States
- Language:
- English
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