Excitations from a Bose-Einstein Condensate of Magnons in Coupled Spin Ladders

Journal Article · Mon Jan 01 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.98.167202· OSTI ID:931094

Garlea, Vasile O ^[1]; Zheludev, Andrey I ^[1]; Masuda, T. ^[2]; Manaka, H. ^[3]; Regnault, L. -P. ^[4]; Ressouche, E. ^[4]; Grenier, B. ^[4]; Chung, J. -H. ^[5]; Qiu, Y. ^[5]; Habicht, Klaus ^[6]; Kiefer, K. ^[6]; Boehm, Martin ^[7]

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1. ORNL
2. Yokohama City University, Japan
3. Kagoshima University, Kagoshima JAPAN
4. CEA, Grenoble, France
5. National Institute of Standards and Technology (NIST)
6. Hahn-Meitner Institut, Berlin, Germany
7. Institut Laue-Langevin (ILL)

The weakly coupled quasi-one-dimensional spin ladder compound CH32HHNH3CuCl3 is studied by neutron scattering in magnetic fields exceeding the critical field of Bose-Einstein condensation of magnons. Commensurate long-range order and the associated Goldstone mode are detected and found to be similar to those in reference to spin-dimer materials. However, for the upper two massive magnon branches, the observed behavior is totally different, culminating in a drastic collapse of excitation bandwidth beyond the transition point.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 931094
• Journal Information: Physical Review Letters, Vol. 98; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSE-EINSTEIN CONDENSATION
CONDENSATES
CRITICAL FIELD
EXCITATION
MAGNETIC FIELDS
MAGNONS
NEUTRONS
SCATTERING
SPIN