Square-lattice spiral magnet Ba{sub 2}CuGe{sub 2}O{sub 7} in an in-plane magnetic field

Journal Article · Mon Dec 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.14006· OSTI ID:550519

Zheludev, A; Maslov, S; Shirane, G ^[1]; Sasago, Y; Koide, N; Uchinokura, K ^[2]; Tennant, D A; Nagler, S E ^[3]

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1. Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
2. Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113 (Japan)
3. Oak Ridge National Laboratory, Building 7692, MS 6393, P.O. Box 2008, Oak Ridge, Tennessee 37831 (United States)

The magnetic structure of Ba{sub 2}CuGe{sub 2}O{sub 7} is investigated by neutron diffraction in magnetic fields applied along several directions in the (a,b) plane of the crystal. In relatively weak fields, H{approx_lt}0.5 T, the propagation vector of the spin spiral rotates to form a finite angle with the field direction. This angle depends on the orientation of {bold H} itself. The rotation of the propagation vector is accompanied by a reorientation of the plane of spin rotation in the spiral. The observed behavior is well described by a continuous-limit form of a free-energy functional that includes exchange and Dzyaloshinskii-Moriya interactions, as well as the Zeeman energy and an empirical anisotropy term. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 550519
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
EXCHANGE INTERACTIONS
FREE ENERGY
GERMANIUM OXIDES
MAGNETIC PROPERTIES
NEUTRON DIFFRACTION
ZEEMAN EFFECT