Sign switching of dimer correlations in SrCu2(BO3)2 under hydrostatic pressure

被引：20
|
作者：
Bettler, S. [1 ]
Stoppel, L. [1 ]
Yan, Z. [1 ]
Gvasaliya, S. [1 ]
Zheludev, A. [1 ]
机构：
[1] Swiss Fed Inst Technol, Lab Solid State Phys, CH-8093 Zurich, Switzerland
来源：
PHYSICAL REVIEW RESEARCH | 2020年 / 2卷 / 01期
基金：
瑞士国家科学基金会;
关键词：
QUANTUM PHASE-TRANSITIONS; SHASTRY-SUTHERLAND MODEL; GROUND-STATE; SPIN SYSTEM; MAGNETIZATION PLATEAUS; PSEUDOPOTENTIALS;
D O I：
10.1103/PhysRevResearch.2.012010
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Magnetic and vibrational excitations in SrCu2(BO3)(2) are studied using Raman spectroscopy at hydrostatic pressures up to 34 kbar and temperatures down to 2.6 K. The frequency of a particular optical phonon, the so-called pantograph mode, shows a very strong anomalous temperature dependence below about 40 K. We link the magnitude of the effect to the magnetic exchange energy on the dimer bonds in the Sutherland-Shastry spin lattice in this material. The corresponding dimer spin correlations are quantitatively estimated and found to be strongly pressure dependent. At around P-2 similar to 22 kbar they switch from antiferromagnetic to being predominantly ferromagnetic.
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页数：6
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