2017/10/05 by Hitesh J. Changlani, Changlani, Hitesh J.
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.1710.02234
openalex publication_date 2017/10/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the finite temperature properties of the candidate quantum spin ice material Yb2Ti2O7 within the framework of an anisotropic nearest-neighbor spin 1/2 model on the pyrochlore lattice. Using a combination of finite temperature Lanczos and classical Monte Carlo methods, we highlight the importance of quantum mechanical effects for establishing the existence and location of the low-temperature ordering transition. We perform simulations of the 32 site cluster, which capture the essential features of the specific heat curve seen in the cleanest known samples of this material. Focusing on recent experimental findings on Yb2Ti2O7 [A. Scheie et al., Phys. Rev. Lett. 119, 127201 (2017) and J. D. Thompson et al., Phys. Rev. Lett. 119, 057203 (2017)], we then address the question of how the phase boundary between the ferromagnetic and paramagnetic phases changes when subjected to a magnetic field. We find that the quantum calculations explain discrepancies observed with a completely classical treatment and show that Yb2Ti2O7 displays significant renormalization effects, which are at the heart of its reentrant lobed phase diagram. Finally, we develop a qualitative understanding of the existence of a ferromagnet by relating it to its counterpart that exists in the vicinity of the classical ice manifold.