M. E. Zhitomirsky
University of Grenoble
Neutron scatteringQuantum spin liquidWave vectorAdiabatic processMagnetic fieldNuclear engineeringCarnot cycleEnergy landscapePhysicsMultiferroicsWork (thermodynamics)Lattice (order)Quantum fluctuationCritical point (thermodynamics)Quantum critical pointSpin glassAntiferromagnetismMagnetCooling capacityDipoleHamiltonian (quantum mechanics)Magnetic refrigerationMaxima and minimaElectron paramagnetic resonanceField (physics)Lattice (group)Materials sciencePerpendicularHeisenberg modelThermalCondensed matter physicsHelicityLinariteANNNI modelJammingInelastic neutron scatteringMagnetizationMagnetic anisotropyFractalCryocoolerIsing modelSemiclassical physicsSpin (physics)GalliumThermal fluctuationsTricritical pointFerromagnetismSpin-½Dilution refrigeratorQuantumAnisotropyPhase diagramCoulombExchange bias
10Publications
7H-index
42Citations
Publications 18
Newest
#3J. Wosnitza (TUD: Dresden University of Technology)H-Index: 26
#4N. Khan (University of Augsburg)H-Index: 14
Last. M. E. Zhitomirsky (UGA: University of Grenoble)H-Index: 7
view all 7 authors...
Source
#1E. Lhotel (UGA: University of Grenoble)H-Index: 14
Last. M. E. ZhitomirskyH-Index: 7
view all 10 authors...
We investigate ytterbium gallium garnet Yb_{3}a_{5}_{12}in the paramagnetic phase above the supposed magnetic transition at T_{\lambda} \approx 54mK. Our study combines susceptibility and specific heat measurements with neutron scattering experiments and theoretical calculations. Below 500 mK, the elastic neutron response is strongly peaked in the momentum space. Along with that the inelastic spectrum develops flat excitation modes. In magnetic field, the lowest energy branch follows...
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#1R. SchickH-Index: 1
#2Timothy Ziman (UGA: University of Grenoble)H-Index: 20
Last. M. E. Zhitomirsky (UGA: University of Grenoble)H-Index: 7
view all 3 authors...
In frustrated magnetic systems with competing interactions fluctuations can lift the residual accidental degeneracy. We argue that the state selection may have different outcomes for quantum and thermal order by disorder. As an example, we consider the semiclassical Heisenberg fcc antiferromagnet with only the nearest-neighbor interactions. Zero-point oscillations select the type 3 collinear antiferromagnetic state at T=0 Thermal fluctuations favor instead the type 1 antiferromagnetic structu...
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#1Andrew WildesH-Index: 30
#2D. LançonH-Index: 7
Last. Henrik M. RønnowH-Index: 53
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High field magnetization measurements in pulsed fields up to 65 T have been performed on {\mathrm{FePS}}_{3} which is nominally a good example of a two-dimensional Ising-like antiferromagnet on a honeycomb lattice. Measurements with the field parallel to the moment direction confirm the presence of two first-order transitions above 35 T, to M/{M}_{\mathrm{sat}}=1/2and M/{M}_{\mathrm{sat}}=1 respectively, at 4 K. The measurements are in contradiction with published estimates for the magn...
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#1Diego Augusto Paixao Brasiliano (CNRS: Centre national de la recherche scientifique)H-Index: 2
#2J. M. Duval (UGA: University of Grenoble)H-Index: 10
Last. Nicolas Luchier (UGA: University of Grenoble)H-Index: 2
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Abstract Adiabatic Demagnetization Refrigerators (ADR) are particularly well adapted for the lowest temperature cooling requirements of the recent and planned astrophysics missions, such as Hitomi, Athena, SPICA or LiteBIRD. With the dilution refrigerator, they are the only established technologies for space to reach temperatures below 200 mK. In the present work, we focus on the heart of the ADR, the paramagnetic material. While the efficiency of the ADR cycle at the material level is close to ...
Source
#1S. K. GotovkoH-Index: 1
#2L. E. SvistovH-Index: 16
Last. M. E. Zhitomirsky (UGA: University of Grenoble)H-Index: 7
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We present combined experimental and theoretical investigation of the low-frequency ESR dynamics in the ordered phases of magnetic mineral linarite. This material consists of weakly coupled spin-1/2 chains of copper ions with frustrated ferro- and antiferromagnetic interactions. In zero magnetic field, linarite orders into a spiral structure and exhibits a peculiar magnetic phase diagram sensitive to the field orientation. The resonance frequencies and their field dependence are analyzed combini...
Source
#1Thomas Bilitewski (MPG: Max Planck Society)H-Index: 8
#2M. E. Zhitomirsky (UGA: University of Grenoble)H-Index: 7
Last. Roderich Moessner (MPG: Max Planck Society)H-Index: 73
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We study the low temperature static and dynamical properties of the classical bond-disordered antiferromagnetic Heisenberg model on the kagome lattice. This model has recently been shown to host a new type of spin liquid exhibiting an exponentially large number of discrete ground states. Surprisingly, despite the rigidity of the groundstates, we establish the vanishing of the corresponding spin stiffness. Locally, the low-lying eigenvectors of the Hessian appear to exhibit a fractal inverse part...
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#7M. E. ZhitomirskyH-Index: 7
Magnetisation measurements and electron spin resonance (ESR) spectra of a doped quasi two dimensional (2D) antiferromagnet on a triangular lattice Rb1-xKxFe(MoO4)(2) reveal a crucial change of the ground state spin configuration and a disappearance of a characteristic 1/3-magnetisation plateau at x = 0.15. According to theory for triangular antiferromagnets with a weak random modulation of the exchange bonds, this is a result of the competition between the structural and dynamic disorders. The d...
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#1E. CemalH-Index: 4
#2Mechthild EnderleH-Index: 9
Last. Timothy ZimanH-Index: 20
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The mineral linarite, PbCuSO_4OH)_2 is a spin 1/2 chain with frustrating nearest neighbor ferromagnetic and next-nearest neighbor antiferromagnetic exchange interactions. Our inelastic neutron scattering experiments performed above the saturation field establish that the ratio between these exchanges is such that linarite is extremely close to the quantum critical point between spin-multipolar phases and the ferromagnetic state. However, the measured complex magnetic phase diagram depends ...
Source
#1Thomas Bilitewski (MPG: Max Planck Society)H-Index: 8
#2M. E. Zhitomirsky (UGA: University of Grenoble)H-Index: 7
Last. Roderich Moessner (MPG: Max Planck Society)H-Index: 73
view all 3 authors...
We study a class of disordered continuous classical spin systems including the kagome Heisenberg magnet. While each term in its local Hamiltonian can be independently minimised, we find {\it discrete} degenerate ground states whose number grows exponentially with system size. These states do not exhibit zero-energy `excitations' characteristic of highly frustrated magnets but instead are local minima of the energy landscape, albeit with an anomalously soft excitation spectrum. This represents a ...
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