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Anand, Naween ; Barry, Kevin ; Neu, Jennifer N. ; Graf, David E. ; Huang, Qing ; Zhou, Haidong ; Siegrist, Theo ; Changlani, Hitesh J. ; Beekman, Christianne ( , Nature Communications)
Abstract The single-ion anisotropy and magnetic interactions in spin-ice systems give rise to unusual non-collinear spin textures, such as Pauling states and magnetic monopoles. The effective spin correlation strength (
J e f f ) determines the relative energies of the different spin-ice states. With this work, we display the capability of capacitive torque magnetometry in characterizing the magneto-chemical potential associated with monopole formation. We build a magnetic phase diagram of Ho2Ti2O7, and show that the magneto-chemical potential depends on the spin sublattice (α orβ ), i.e., the Pauling state, involved in the transition. Monte Carlo simulations using the dipolar-spin-ice Hamiltonian support our findings of a sublattice-dependent magneto-chemical potential, but the model underestimates theJ e f f for theβ -sublattice. Additional simulations, including next-nearest neighbor interactions (J 2), show that long-range exchange terms in the Hamiltonian are needed to describe the measurements. This demonstrates that torque magnetometry provides a sensitive test forJ e f f and the spin-spin interactions that contribute to it. -
Barry, Kevin ; Zhang, Biwen ; Anand, Naween ; Xin, Yan ; Vailionis, Arturas ; Neu, Jennifer ; Heikes, Colin ; Cochran, Charis ; Zhou, Haidong ; Qiu, Y. ; et al ( , Physical Review Materials)
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Anand, Naween ; Buvaev, Sanal ; Hebard, A. F. ; Tanner, D. B. ; Chen, Zhiguo ; Li, Zhiqiang ; Choudhary, Kamal ; Sinnott, S. B. ; Gu, Genda ; Martin, C. ( , Physical Review B)