Magnetic field-induced phase transitions in a weakly coupled s = 1/2 quantum spin dimer system Ba$_{3}$Cr$_{2}$O$_{8}$

B. Lake; C. D. Batista; H. Nojiri; H. Ueda; K. Rule; M. Kofu; S. Gerischer; S.-H. Lee; T. Zenmoto; Y. Oshima

arxiv: 0902.4229 · v2 · pith:VLUQ33NYnew · submitted 2009-02-24 · ❄️ cond-mat.str-el

Magnetic field-induced phase transitions in a weakly coupled s = 1/2 quantum spin dimer system Ba₃Cr₂O₈

M. Kofu , H. Ueda , H. Nojiri , Y. Oshima , T. Zenmoto , K. Rule , S. Gerischer , B. Lake

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C. D. Batista Y. Ueda S.-H. Lee

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keywords phasequantumspinstatebulkc-axiscapacitycharacterize

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By using bulk magnetization, electron spin resonance (ESR), heat capacity, and neutron scattering techniques, we characterize the thermodynamic and quantum phase diagrams of Ba$_3$Cr$_2$O$_8$. Our ESR measurements indicate that the low field paramagnetic ground state is a mixed state of the singlet and the S$_z$ = 0 triplet for $H \perp c$. This suggests the presence of an intra-dimer Dzyaloshinsky-Moriya (DM) interaction with a DM vector perpendicular to the c-axis.

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Magnetic field-induced phase transitions in a weakly coupled s = 1/2 quantum spin dimer system Ba₃Cr₂O₈

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