Magnetic order of tetragonal CuO ultrathin films

被引：4

作者：

Hernandez, N. Ortiz ^{[1
]}

Salman, Z. ^{[2
]}

Prokscha, T. ^{[2
]}

Suter, A. ^{[2
]}

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

Moser, S. ^{[4
,5
,6
]}

Zakharova, A. ^{[1
]}

Piamonteze, C. ^{[1
]}

Staub, U. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[2] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

[3] DESY, D-22607 Hamburg, Germany

[4] EO Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[5] Univ Wurzburg, Phys Inst, D-97074 Wurzburg, Germany

[6] Univ Wurzburg, Wurzburg Dresden Cluster Excellence Ct Qmat, D-97074 Wurzburg, Germany

来源：

PHYSICAL REVIEW B | 2021年 / 103卷 / 22期

基金：

瑞士国家科学基金会;

关键词：

CIRCULAR-DICHROISM; SUM-RULES; SUPERCONDUCTIVITY; ANISOTROPY;

D O I：

10.1103/PhysRevB.103.224429

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a detailed low-energy muon spin rotation and x-ray magnetic circular dichroism (XMCD) investigation of the magnetic structure in ultrathin tetragonal (T)-CuO films. The measured muon-spin polarization decay indicates an antiferromagnetic (AFM) order with a transition temperature higher than 200 K. The XMCD signal obtained around the Cu L-2,L-3 edges indicates the presence of pinned Cu2+ moments that are parallel to the sample surface, and additionally, isotropic paramagnetic moments. The pinning of some of the Cu moments is caused by an AFM ordering consisting of moments that lie most likely in plane of the film. Moreover, pinned moments show a larger orbital magnetic moment contribution with an approximate ratio of m(orb)/m(spin) = 1.5, indicating that these spins are located at sites with reduced symmetry. Some fractions of the pinned moments remain pinned from an AFM background even at 360 K, indicating that T-N > 360 K. We propose a simple model that explains these experimental findings, showing that the magnetic order of the T-CuO ultrathin films differs from the theoretical predictions.

引用

页数：11

共 36 条

[1] XMCD SUM-RULES AT CU(2+)L(2,3) EDGE [J].