Magnetization beyond the Ising limit of Ho2Ti2O7
| Autor: | Denis Gorbunov, Takashi Suzuki, Thomas Herrmannsdörfer, Marc Uhlarz, Oliver Portugall, Hiroshi Kaneko, Atsuhiko Miyata, Haruhiko Suzuki, L. Opherden, Isao Ishii, J. Wosnitza |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed matter physics Pyrochlore 02 engineering and technology Level crossing engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Ion Magnetic field Magnetization 0103 physical sciences engineering Condensed Matter::Strongly Correlated Electrons Ising model 010306 general physics 0210 nano-technology Anisotropy Saturation (magnetic) |
| Zdroj: | Physical Review B. 99 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We report that the local Ising anisotropy in pyrochlore oxides---the crucial requirement for realizing the spin-ice state---can be broken by means of high magnetic fields. For the case of the well-established classical spin-ice compound ${\mathrm{Ho}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ the magnetization exceeds the angle-dependent saturation value of the Ising limit using ultrahigh fields up to 120 T. However, even under such extreme magnetic fields full saturation cannot be achieved. Crystal-electric-field calculations reveal that a level crossing for two of the four ion positions leads to magnetization steps at 55 and 100 T. In addition, we show that by using a field sweep rate in the range of the spin-relaxation time the dynamics of the spin system can be probed. Exclusively at 25 ns/T, a new peak of the susceptibility appears around 2 T. We argue, this signals the crossover between spin-ice and polarized correlations. |
| Databáze: | OpenAIRE |
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