Mark Wartenbe

Area of research

Condensed Matter Physics · Electronic, Optical and Magnetic Materials

Research interest

Research topics from publications: Scaling between magnetic field and temperature in the high-temperature superconductor BaFe2(As1−xPx)2; Transport near a quantum critical point in BaFe2(As1−xPx)2; Evidence for a nematic component to the hidden-order parameter in URu2Si2 from differential elastoresistance measurements; Fiber Bragg Grating Dilatometry in Extreme Magnetic Field and Cryogenic Conditions; Magnetoelastic coupling in URu2Si2: Probing multipolar correlations in the hidden order state; Direct Probe Mounted High-Performance Amplifiers for Pulsed Measurement. Representative work: For materials that harbour a continuous phase transition, the susceptibility of the material to various fields can be used to understand the nature of the fluctuating order and hence the nature of the ordered state. Here we use anisotropic biaxial strain to probe the nematic susceptibility of URu2Si2, a heavy fermion material for which the nature of the low temperature ‘hidden order’ state has defied comprehensive understanding for over 30 years. Our measurements reveal that the fluctuating order has a nematic component, confirming reports of twofold anisotropy in the broken symmetry state and strongly constraining theoretical models of the hidden-order phase. The heavy fermion material URu2 In this work, we review single mode SiO2 fiber Bragg grating techniques for dilatometry studies of small single-crystalline samples in the extreme environments of very high, continuous, and pulsed magnetic fields of up to 150 T and at cryogenic temperatures down to <1 K. Distinct millimeter-long materials are measured as part of the technique development, including metallic, insulating, and radioactive compounds. Experimental strategies are discussed for the observation and analysis of the related thermal expansion and magnetostriction of materials, which can achieve a strain sensitivity (ΔL/L) as low as a few parts in one hundred million (≈10−8). The impact of experimental artifacts, such a

Looking for a research collaborator?

Search millions of scientists by field, institution, impact, and funding status — see their work, find their email, and reach out directly.