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Magnets in high magnetic fields display a remarkable diversity of fascinating physical behaviour, including clean realizations of magnetic quantum phase transitions and exotic quantum phases [1,2]. This is particularly true for quasi-1D two-leg spin ladders, which show a very rich phase diagram in temperature and magnetic field. We have studied the quantum disordered, quantum critical, spin Luttinger liquid, and saturated phase in an exceptional, very one-dimensional metal-organic material with optimal energy scale for experiments [3-6]. Using neutron scattering and measurements of the magnetostriction, magnetocaloric effect, and specific heat we determine the characteristic static and dynamic properties of each phase and compare the results with elaborate predictions by theory.
[1] S. Sachdev, Nature Physics 4, 173 (2008). [2] T. Giamarchi, Ch. Rüegg, O. Tchernyshyov, Nature Physics 4, 198 (2008). [3] T. Lorenz et al., Phys. Rev. Lett. 100, 067208 (2008). [4] F. Anfuso et al., Phys. Rev. B. 77, 235113 (2008). [5] Ch. Rüegg et al., submitted. [6] B. Thielemann et al., submitted. |
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