Temperature-Dependent Spin Gap in Multiferroic 2D-XY Antiferromagnet Ba2CoGe2O7 Under Applied Magnetic Fields

被引：0

作者：

Dutta, Rajesh ^{[1
,2
]}

Thoma, Henrik ^{[1
,2
]}

Roessli, Bertrand ^{[3
]}

Kocsis, Vilmos ^{[4
,5
]}

Tokunaga, Yusuke ^{[4
,6
]}

Taguchi, Yasujiro ^{[4
]}

Tokura, Yoshinori ^{[4
,7
,8
]}

Kezsmarki, Istvan ^{[9
,10
]}

Hutanu, Vladimir ^{[1
,2
]}

机构：

[1] Rhein Westfal TH Aachen, Rheinisch Westfal Tech Hsch RWTH, Inst Kristallographie, D-52066 Aachen, Germany

[2] Heinz Maier Leibnitz Zentrum, Julich Ctr Neutron Sci, D-85747 Garching, Germany

[3] Paul Scherrer Inst PSI, Lab Neutron Scattering & Imaging LNS, CH-5232 Villigen, Switzerland

[4] RIKEN, Ctr Emergent Matter Sci CEMS, Wako, Saitama 3510198, Japan

[5] Budapest Univ Technol & Econ, MTA BME Lendulet Magneto Opt Spect Res Grp, Dept Phys, H-1111 Budapest, Hungary

[6] Univ Tokyo, Dept Adv Mat Sci, Kashiwa, Chiba 2778561, Japan

[7] Univ Tokyo, Dept Appl Phys, Quantum Phase Elect Ctr, Tokyo 1138656, Japan

[8] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan

[9] Univ Augsburg, Dept Expt Phys 5, D-86159 Augsburg, Germany

[10] Tech Univ Munich, FRM 2, D-85747 Garching, Germany

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2023年 / 59卷 / 11期

关键词：

Antiferromagnet (AFM); inelastic neutron scattering (INS); multiferroic; spin waves;

D O I：

10.1109/TMAG.2023.3284597

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We report an inelastic neutron scattering (INS) study on the low-energy magnetic excitations of Ba2CoGe2O7 single crystals under applied magnetic fields for several fixed temperatures. We have observed a sizable spin gap of approximate to 0.105 meV for the acoustic mode at 2.2 K under zero magnetic fields, whereas no changes in energy of the optical modes at the magnetic zone center are observed under varying temperatures. However, the spin gap of the acoustic mode at finite fields also evolves under varying temperatures and the gap energy decreases with increasing temperature. Interestingly, the difference between the spin gap at 2.2 and 4.6 K is about approximate to 0.025 meV for all the applied fields of 0.35, 1, and 5 T. Our results enlighten the discussion in detail on understanding the origin of the spin gap in Ba2CoGe2O7.

引用

页数：4

共 17 条

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