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Bose-Einstein Condensation of S = 1 Ni spin degrees of freedom in NiCl2-4SC(NH2)2 | | V. S. Zapf
; D. Zocco
; M. Jaime
; N. Harrison
; A. Lacerda
; C. D. Batista
; A. Paduan-Filho
; | | Date: |
23 May 2005 | | Subject: | Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci | | Abstract: | It has recently been suggested that the organic compound NiCl$_2$-4SC(NH$_2$)$_2$ (DTN) exhibits Bose-Einstein Condensation (BEC) of the Ni spin degrees of freedom for fields applied along the tetragonal c-axis. The Ni spins exhibit 3D XY-type antiferromagnetic order above a field-induced quantum critical point at $H_{c1} sim 2$ T. The Ni spin fluid can be characterized as a system of effective bosons with a hard-core repulsive interaction in which the antiferromagnetic state corresponds to a Bose-Einstein condensate (BEC) of the phase coherent $S = 1$ Ni spin system. We have investigated the the high-field phase diagram and the occurrence of BEC in DTN by means of specific heat and magnetocaloric effect measurements to dilution refrigerator temperatures. Our results indicate that a key prediction of BEC is satisfied; the magnetic field-temperature quantum phase transition line $H_c(T)-H_{c1} propto T^alpha$ approaches a power-law at low temperatures, with an exponent $alpha = 1.47 pm 0.06$ at the quantum critical point, consistent with the BEC theory prediction of $alpha = 1.5$. | | Source: | arXiv, cond-mat/0505562 | | Services: | Forum | Review | PDF | Favorites | |
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