Bose-Einstein Condensation of Triplons in Ba3Cr2O8

Details Bose-Einstein Condensation of Triplons in Ba3Cr2O8 Bose-Einstein Condensation of Triplons in Ba3Cr2O8

2009-01-12

arxiv.org/abs/0901.1623v2

Phys. Rev. B 79, 100409 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, Accepted by PRB

Scientific paper

10.1103/PhysRevB.79.100409

By performing heat capacity, magnetocaloric effect, torque magnetometry and force magnetometry measurements up to 33 T, we have mapped out the T-H phase diagram of the S = 1/2 spin dimer compound Ba3Cr2O8. We found evidence for field-induced magnetic order between Hc1 = 12.52(2) T and Hc2 = 23.65(5) T, with the maximum transition temperature Tc = 2.7 K at H = 18 T. The lower transition can likely be described by Bose-Einstein condensation of triplons theory, and this is consistent with the absence of any magnetization plateaus in our magnetic torque and force measurements. In contrast, the nature of the upper phase transition appears to be quite different as our measurements suggest that this transition is actually first order.

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