Possible Quantum Paramagnetism in Compressed Sr2IrO4

被引：22

作者：

Haskel, D. ^{[1
]}

Fabbris, G. ^{[1
]}

Kim, J. H. ^{[1
]}

Veiga, L. S. I. ^{[1
,2
,3
,4
,5
]}

Mardegan, J. R. L. ^{[1
,3
]}

Escanhoela, C. A., Jr. ^{[1
,2
]}

Chikara, S. ^{[1
]}

Struzhkin, V. ^{[6
]}

Senthil, T. ^{[7
]}

Kim, B. J. ^{[8
,9
]}

Cao, G. ^{[10
]}

Kim, J. -W. ^{[1
]}

机构：

[1] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[2] Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP, Brazil

[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil

[4] UCL, London Ctr Nanotechnol, Gower St, London WC1E 6BT, England

[5] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

[6] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[7] MIT, Dept Phys, Cambridge, MA 02139 USA

[8] Inst for Basic Sci Korea, Ctr Artificial Low Dimens Elect Syst, 77 Cheongam Ro, Pohang 790784, South Korea

[9] Pohang Univ Sci & Technol, Dept Phys, Pohang 790784, South Korea

[10] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 06期

基金：

英国工程与自然科学研究理事会; 美国国家科学基金会; 巴西圣保罗研究基金会;

关键词：

ANISOTROPIC SUPEREXCHANGE INTERACTION; RAY CIRCULAR-DICHROISM; VALENCE-BOND STATE; SPIN; TEMPERATURE; TOPOLOGY; PHASE;

D O I：

10.1103/PhysRevLett.124.067201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The effect of compression on the magnetic ground state of Sr2IrO4 is studied with x-ray resonant techniques in the diamond anvil cell. The weak interlayer exchange coupling between square-planar 2D IrO2 layers is readily modified upon compression, with a crossover between magnetic structures around 7 GPa mimicking the effect of an applied magnetic field at ambient pressure. Higher pressures drive an order-disorder magnetic phase transition with no magnetic order detected above 17-20 GPa. The persistence of strong exchange interactions between J(eff) = 1/2 magnetic moments within the insulating IrO2 layers up to at least 35 GPa points to a highly frustrated magnetic state in compressed Sr2IrO4, opening the door for realization of novel quantum paramagnetic phases driven by extended 5d orbitals with entangled spin and orbital degrees of freedom.

引用

页数：7

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