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Spin noise spectroscopy has become a widespread technique to extract information on spin dynamics in atomic and solid-state systems, in a potentially non-invasive way, through the optical probing of spin fluctuations. Here we experimentally…

Polarized neutron inelastic scattering has been used to measure spin excitations in ferromagnetic La$_{0.82}$Sr$_{0.18}$CoO$_{3}$. The magnon spectrum of these spin excitations is well defined at low energies but becomes heavily damped at…

Strongly Correlated Electrons · Physics 2010-10-08 R. A. Ewings , P. G. Freeman , M. Enderle , J. Kulda , D. Prabhakaran , A. T. Boothroyd

We investigate the quasiparticle relaxation and low-energy electronic structure in undoped SrFe_2As_2 exhibiting spin-density wave (SDW) ordering using optical pump-probe femtosecond spectroscopy. A remarkable critical slowing down of the…

Strongly Correlated Electrons · Physics 2010-07-20 L. Stojchevska , P. Kusar , T. Mertelj , V. V. Kabanov , X. Lin , G. H. Cao , Z. A. Xu , D. Mihailovic

The electron spin resonance spectrum of a quasi 1D S=1/2 antiferromagnet K2CuSO4Br2 was found to demonstrate an energy gap and a doublet of resonance lines in a wide temperature range between the Curie--Weiss and Ne\`{e}l temperatures. This…

Strongly Correlated Electrons · Physics 2015-10-28 A. I. Smirnov , T. A. Soldatov , K. Yu. Povarov , M. Hälg , W. E. A. Lorenz , A. Zheludev

The impurity-induced antiferromagnetic ordering of the doped Haldane magnet Pb(Ni{1-x}Mg{x})2V2O8 (0 < x <0.06) was studied by electron spin resonance (ESR) on ceramic samples in the frequency range 9-110 GHz. Below the N\'{e}el temperature…

Strongly Correlated Electrons · Physics 2009-11-07 A. I. Smirnov , V. N. Glazkov , H. -A. Krug von Nidda , A. Loidl , L. N. Demianets , A. Ya. Shapiro

The tunability and spatial precision of paramagnetic molecules makes them attractive for quantum sensing. However, usual microwave-based detection methods have poor temporal and spatial resolution, and optical methods compatible with…

Quantum Physics · Physics 2024-07-30 Erica Sutcliffe , Nathanael P. Kazmierczak , Ryan G. Hadt

Magnonics is seen nowadays as a candidate technology for energy-efficient data processing in classical and quantum systems. Pronounced nonlinearity, anisotropy of dispersion relations and phase degree of freedom of spin waves require…

The spin transition in LaCoO3 is investigated by temperature-dependent resonant soft X-ray emission spectroscopy near the Co 2p absorption edges. This element-specific technique is more bulk sensitive with respect to the temperature induced…

Strongly Correlated Electrons · Physics 2011-12-30 M. Magnuson , S. M. Butorin , C. Såthe , J. Nordgren , P. Ravindran

We have investigated the electron spin resonance (ESR) on single crystals of BaCu$\_2$Ge$\_2$O$\_7$ at temperatures between 300 and 2 K and in a large frequency band, 9.6 -134 GHz, in order to test the predictions of a recent theory,…

Strongly Correlated Electrons · Physics 2007-05-23 Sylvain Bertaina , V. A. Pashchenko , Anatoli Stepanov , T. Masuda , K. Uchinokura

We present a nuclear magnetic resonance (NMR) and electron spin resonance (ESR) study of rare-earth titanates derived from the spin-1/2 Mott insulator YTiO$_3$. Measurements of single-crystalline samples of (Y,Ca,La)TiO$_3$ in a wide range…

Strongly Correlated Electrons · Physics 2024-05-10 Ana Najev , Sajna Hameed , Alexey Alfonsov , Joseph Joe , Vladislav Kataev , Martin Greven , Miroslav Požek , Damjan Pelc

We have carried out temperature-dependent inelastic neutron scattering measurements of YMnO3 over the temperature range 50 - 1303 K, covering both the antiferromagnetic to paramagnetic transition (70 K), as well as the ferroelectric to…

A multi-frequency electron spin resonance (ESR) study provides evidence for the occurrence of low temperature ferromagnetic/spin-glass behavior in aligned arrays of sub-nanometer single walled carbon nanotubes confined in zeolite…

Mesoscale and Nanoscale Physics · Physics 2015-05-19 S. S. Rao , A. Stesmans , J. V. Noyen , P. Jacobs , B. Sels

Circular dichroism spectroscopy is known to provide important insights into the interplay of different degrees of freedom in quantum materials, and yet spectroscopic study of the optoelectronic responses of quantum materials to structured…

Structural phase transitions and soft phonon modes pose a longstanding challenge to computing electron-phonon (e-ph) interactions in strongly anharmonic crystals. Here we develop a first-principles approach to compute e-ph scattering and…

Materials Science · Physics 2018-12-04 Jin-Jian Zhou , Olle Hellman , Marco Bernardi

The research on layered van der Waals (vdW) magnets is rapidly progressing owing to exciting fundamental science and potential applications. In bulk crystal form, CrCl3 is a vdW antiferromagnet with in-plane ferromagnetic ordering below 17…

We have developed a spin-resolved resonant electron energy-loss spectroscopy (SR-rEELS) in the primary energy of 0.3--1.5 keV, which corresponds to the core excitations of $2p$-$3d$ absorption of transition metals and $3d$-$4f$ absorption…

Electron spin resonance study of frustrated pyrochlore Gd2Ti2O7 is performed in a wide frequency band for a temperature range 0.4-30 K, which covers paramagnetic and magnetically ordered phases. The paramagnetic resonance reveals the…

Strongly Correlated Electrons · Physics 2012-02-02 S. S. Sosin , A. I. Smirnov , L. A. Prozorova , G. Balakrishnan , M. E. Zhitomirsky

We consider the spin correlation functions for rare-earth compounds in their paramagnetic state with the aim to understand the temperature dependence of the quasi-elastic and crystal-field linewidths and the spin-lattice relaxation rates…

Materials Science · Physics 2009-12-21 A. Yaouanc

We demonstrate electron spin polarization detection and electron paramagnetic resonance (EPR) spectroscopy using a direct current superconducting quantum interference device (dc-SQUID) magnetometer. Our target electron spin ensemble is…

Mesoscale and Nanoscale Physics · Physics 2024-06-24 Hiraku Toida , Yuichiro Matsuzaki , Kosuke Kakuyanagi , Xiaobo Zhu , William J. Munro , Kae Nemoto , Hiroshi Yamaguchi , Shiro Saito

We combined a spin-resolved photoemission spectrometer with a high-harmonic generation (HHG) laser source in order to perform spin-, time- and angle-resolved photoemission spectroscopy (STARPES) experiments on the transition metal…

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