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Instruments / Technical Area	Publication Details	Published	Actions
I06-Nanoscience	Spin flop and crystalline anisotropic magnetoresistance in CuMnAs M. Wang , C. Andrews , S. Reimers , O. J. Amin , P. Wadley , R. P. Campion , S. F. Poole , J. Felton , K. W. Edmonds , B. L. Gallagher , A. W. Rushforth , O. Makarovsky , K. Gas , M. Sawicki , D. Kriegner , J. Zubáč , K. Olejník , V. Novák , T. Jungwirth , M. Shahrokhvand , U. Zeitler , S. S. Dhesi , F. Maccherozzi Physical Review B 101 DOI: 10.1103/PhysRevB.101.094429 Diamond Proposal Number(s): [11846, 20793] Show Abstract ▼ Abstract: We report magnetic-field-induced rotation of the antiferromagnetic Néel vector in epitaxial CuMnAs thin films. First, using soft x-ray magnetic linear dichroism spectroscopy as well as magnetometry, we demonstrate spin-flop switching and continuous spin reorientation in films with uniaxial and biaxial magnetic anisotropies, respectively, for applied magnetic fields of the order of 2 T. The remnant antiferromagnetic domain configurations are determined using x-ray photoemission electron microscopy. Next, we show that the Néel vector reorientations are manifested in the longitudinal and transverse anisotropic magnetoresistance. Dependencies of the electrical resistance on the orientation of the Néel vector with respect to both the electrical current direction and the crystal symmetry are identified, including a weak fourth-order term evident at high magnetic fields. The results provide characterization of key parameters including the anisotropic magnetoresistance coefficients, magnetocrystalline anisotropy, and spin-flop field in epitaxial films of tetragonal CuMnAs, a candidate material for antiferromagnetic spintronics.	Mar 2020
I05-ARPES	Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal candidate NbP Chandra Shekhar , Ajaya K. Nayak , Yan Sun , Marcus Schmidt , Michael Nicklas , Inge Leermakers , Uli Zeitler , Yurii Skourski , Jochen Wosnitza , Zhongkai Liu , Yulin Chen , Walter Schnelle , Horst Borrmann , Yuri Grin , Claudia Felser , Binghai Yan Nature Physics 11 (8), 645 - 649 DOI: 10.1038/nphys3372 Diamond Proposal Number(s): [13177] Show Abstract ▼ Abstract: Recent experiments have revealed spectacular transport properties in semimetals, such as the large, non-saturating magnetoresistance exhibited by WTe2 (ref. 1). Topological semimetals with massless relativistic electrons have also been predicted2 as three-dimensional analogues of graphene3. These systems are known as Weyl semimetals, and are predicted to have a range of exotic transport properties and surface states4, 5, 6, 7, distinct from those of topological insulators8, 9. Here we examine the magneto-transport properties of NbP, a material the band structure of which has been predicted to combine the hallmarks of a Weyl semimetal10, 11 with those of a normal semimetal. We observe an extremely large magnetoresistance of 850,000% at 1.85 K (250% at room temperature) in a magnetic field of up to 9 T, without any signs of saturation, and an ultrahigh carrier mobility of 5 × 106 cm2 V−1 s−1 that accompanied by strong Shubnikov–de Haas (SdH) oscillations. NbP therefore presents a unique example of a material combining topological and conventional electronic phases, with intriguing physical properties resulting from their interplay.	Jun 2015

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