corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 17
< Previous Article | Next Article >

Phys. Rev. Lett. 102, 177204 (2009) [4 pages]

Magnetic-Field Induced Phase Transitions in a Weakly Coupled s=1/2 Quantum Spin Dimer System Ba3Cr2O8

Download: PDF (2,047 kB) Buy this article Export: BibTeX or EndNote (RIS)

M. Kofu1, H. Ueda2, H. Nojiri3, Y. Oshima3, T. Zenmoto3, K. C. Rule4, S. Gerischer4, B. Lake4,5, C. D. Batista6, Y. Ueda2, and S.-H. Lee1,*
1Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
2Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
3Institute for Materials Research, Tohoku University, Sendai, Miyagi 980-0821, Japan
4Helmholtz-Zentrum Berlin, Berlin 14109, Germany
5Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
6Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545 USA

Received 28 February 2009; revised 3 April 2009; published 29 April 2009

By using bulk magnetization, electron spin resonance (ESR), heat capacity, and neutron scattering techniques, we characterize the thermodynamic and quantum phase diagrams of Ba3Cr2O8. Our ESR measurements indicate that the low field paramagnetic ground state is a mixed state of the singlet and the Sz=0 triplet for H⊥c. This suggests the presence of an intradimer Dzyaloshinsky-Moriya (DM) interaction with a DM vector perpendicular to the c axis.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.177204
DOI:
10.1103/PhysRevLett.102.177204
PACS:
75.10.Jm, 64.70.Tg, 75.25.+z

*shlee@virginia.edu

 
< Previous Article | Next Article >