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The 27th AIRAPT International Conference on High Pressure Science and Technology
Abstract

Investigação


Novel states of quantum matter underpinned by high-pressure experiments

Authors:
Julio Larrea (IF USP - Institute of Physics, University of Sao Paulo) ; Valentina Martelli (IF USP - Institute of Physics, University of Sao Paulo) ; Mohamed Zayed (CMU-Q - Carnegie Mellon University in Qatar) ; Henrik Ronnow (LQM-EPFL - Laboratory for Quantum Magnetism, École Polytechnique Fédérale de Lausanne) ; Silke Paschen (TUWIEN - Institute of Solid State Physics, Vienna University of Technology, Austria)

Abstract:

In this talk, I will discuss the state-of-the-art of novel states of quantum matter underpinned by experimental methods under extreme conditions: very low temperatures, very high-pressures and intensive magnetic fields.

I focus my discussion on the physics of quantum phase transition (QPT), the transition that separates two different states at zero temperature (T= 0K). Electronic and spin degree of freedoms in materials as heavy fermion Ce3Pd20Si6 and frustrated magnet SrCu2(BO3)2 can be disentangled by the application of high-pressure and high magnetic fields. By measuring challenge specific heat, magnetic susceptibility and electrical transport at extreme conditions, we observe unconventional physical properties as fingerprint of the existence of a QPT and concomitant novel state of quantum matter, such as Non-Fermi liquid and plaquette phases. I will discuss some physical scenarios that tentatively account for the physics of a quantum phase transition, including those ascribed to low-lying interactions between dipolar and quadrupolar electronic degree of freedoms [1] and spin entanglement [2].

 

[1] J. Larrea J., et al . Phy. Rev. B 93, 125121 (2016); V. Martelli, J. Larrea et. al,  arXiv:1709.09376

[2] M. E. Zayed, J. Larrea J, et al. Nature Physics 13, 962 (2017)

 

V. M and S. P acknowledge Austrian Science Fund (P29296-N27 and DK W1243), the European Research Council (Advanced Grant 227378). M. Z and H. R acknowledge Swiss National Science Foundation SNF and the Royal Society (UK). J. L. J acknowledges to CNPq-Universal (431083/2018-5) and FAPESP Young Researcher Grant (2018/08845-3).