التفاصيل البيبلوغرافية
| العنوان: |
Pinch points and Kasteleyn transitions in kagome ice. |
| المؤلفون: |
Fennell, T.1,2 t.fennell@ucl.ac.uk, Bramwell, S. T.1,3, McMorrow, D. F.1,2,4, Manuel, P.4, Wildes, A. R.5 |
| المصدر: |
Nature Physics. Aug2007, Vol. 3 Issue 8, p566-572. 7p. 5 Graphs. |
| مصطلحات موضوعية: |
*PINCH effect (Physics), *ENTROPY, *MAGNETIC fields, *QUANTUM theory, *PHYSICS |
| مستخلص: |
Complex disordered states—from liquids and glasses to exotic quantum matter—are ubiquitous in nature. Their key properties include finite entropy, power-law correlations and emergent organizing principles. In spin ice, spin correlations are determined by the ‘ice rules’ organizing principle that stabilizes a magnetic state with the same zero-point entropy as water ice. The entropy can be manipulated with great precision by an applied magnetic field: when directed along the three-fold crystallographic axis, the field produces a state of finite entropy, known as kagome ice. Here, we investigate the spin-ice material Ho2Ti2O7 by tilting the magnetic field slightly away from that axis. We thus realize a classic statistical system named after Kasteleyn, in which the entropy of a critical phase can be continuously tuned. Our neutron scattering experiments reveal how this process occurs at a microscopic level. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
