Monica Ciomaga Hatnean
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View article: Anisotropic fracture in gadolinium zirconate single crystal: Micromechanical testing and modelling
Anisotropic fracture in gadolinium zirconate single crystal: Micromechanical testing and modelling Open
View article: Magnetic properties of the zigzag ladder compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>SrTb</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
Magnetic properties of the zigzag ladder compound Open
We report on the properties of SrTb2O4, a frustrated zigzag ladder antiferromagnet, studied by single crystal neutron diffraction (with polarized neutrons in zero field and unpolarized neutrons in an applied magnetic field), as well as by …
View article: An inelastic neutron scattering study of the magnetic field dependence of the quantum dipolar garnet: Yb$_3$Ga$_5$O$_{12}$
An inelastic neutron scattering study of the magnetic field dependence of the quantum dipolar garnet: Yb$_3$Ga$_5$O$_{12}$ Open
The garnet compound Yb$_3$Ga$_5$O$_{12}$ is a fascinating material that is considered highly suitable for low-temperature refrigeration, via the magnetocaloric effect, in addition to enabling the exploration of quantum states with long-ran…
View article: Magnetic properties of the zigzag ladder compound SrTb2O4
Magnetic properties of the zigzag ladder compound SrTb2O4 Open
We report on the properties of SrTb2O4, a frustrated zigzag ladder antiferromagnet, studied by single crystal neutron diffraction (with polarised neutrons in zero field and unpolarised neutrons in an applied magnetic field), as well as by …
View article: Charge doping into spin minority states mediates doubling of TC in ferromagnetic CrGeTe3
Charge doping into spin minority states mediates doubling of TC in ferromagnetic CrGeTe3 Open
View article: Impact of disorder in Nd-based pyrochlore magnets
Impact of disorder in Nd-based pyrochlore magnets Open
We study the stability of the antiferromagnetic all-in--all-out state\nobserved in dipolar-octupolar pyrochlores that have neodymium as the magnetic\nspecies. Different types of disorder are considered, either affecting the\nimmediate envi…
View article: Magnetic structure, excitations, and field-induced transitions in the honeycomb lattice compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Er</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>
Magnetic structure, excitations, and field-induced transitions in the honeycomb lattice compound Open
We investigate the magnetic properties of the monoclinic D-type Er2Si2O7 with a distorted honeycomb lattice using powder and single-crystal neutron scattering techniques, as well as single-crystal magnetization measurements. The powder neu…
View article: Electrical transport signatures of metallic surface state formation in the strongly-correlated insulator FeSb2
Electrical transport signatures of metallic surface state formation in the strongly-correlated insulator FeSb2 Open
We present local and nonlocal electrical transport measurements of the correlated insulator FeSb$_2$. By employing wiring configurations that delineate between bulk- and surface-dominated conduction, we reveal the formation of a metallic s…
View article: Flux-pinning mediated superconducting diode effect in NbSe<sub>2</sub>/CrGeTe<sub>3</sub> heterostructure
Flux-pinning mediated superconducting diode effect in NbSe<sub>2</sub>/CrGeTe<sub>3</sub> heterostructure Open
In ferromagnet/superconductor bilayer systems, dipolar fields from the ferromagnet can create asymmetric energy barriers for the formation and dynamics of vortices through flux pinning. Conversely, the flux emanating from vortices can pin …
View article: Anisotropic Fracture in Gadolinium Zirconate Single Crystal: Micromechanical Testing and Modelling
Anisotropic Fracture in Gadolinium Zirconate Single Crystal: Micromechanical Testing and Modelling Open
View article: Crystal Growth of the R2SiO5 Compounds (R = Dy, Ho, and Er) by the Floating Zone Method Using a Laser-Diode-Heated Furnace
Crystal Growth of the R2SiO5 Compounds (R = Dy, Ho, and Er) by the Floating Zone Method Using a Laser-Diode-Heated Furnace Open
In recent years, rare earth silicate compounds have attracted the extensive attention of researchers owing to their potential for applications in scintillation crystals in gamma ray or X-ray detectors, as well as in thermal or environmenta…
View article: Charge doping into spin minority states mediates doubling of $T_\mathrm{C}$ in ferromagnetic CrGeTe$_3$
Charge doping into spin minority states mediates doubling of $T_\mathrm{C}$ in ferromagnetic CrGeTe$_3$ Open
The recent discovery of the persistence of long-range magnetic order when van der Waals layered magnets are thinned towards the monolayer limit has provided a tunable platform for the engineering of novel magnetic structures and devices. H…
View article: Magnetic structure, excitations and field induced transitions in the honeycomb lattice $\rm{Er_2Si_2O_7}$
Magnetic structure, excitations and field induced transitions in the honeycomb lattice $\rm{Er_2Si_2O_7}$ Open
We investigate the magnetic properties of the monoclinic D-type $\rm{Er_2Si_2O_7}$ with a distorted honeycomb lattice using powder and single crystal neutron scattering techniques, as well as single crystal magnetisation measurements. The …
View article: Covalency, correlations, and interlayer interactions governing the magnetic and electronic structure of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>
Covalency, correlations, and interlayer interactions governing the magnetic and electronic structure of Open
Mn3Si2Te6 is a rare example of a layered ferrimagnet. It has recently been shown to host a colossal angular magnetoresistance as the spin orientation is rotated from the in- to out-of-plane direction, proposed to be underpinned by a topolo…
View article: Adherence of the rotating vortex lattice in the noncentrosymmetric superconductor Ru<sub>7</sub>B<sub>3</sub> to the London model
Adherence of the rotating vortex lattice in the noncentrosymmetric superconductor Ru<sub>7</sub>B<sub>3</sub> to the London model Open
The noncentrosymmetric superconductor Ru 7 B 3 has in previous studies demonstrated remarkably unusual behaviour in its vortex lattice (VL), where the nearest neighbour directions of the vortices dissociate from the crystal lattice and ins…
View article: Covalency, correlations, and inter-layer interactions governing the magnetic and electronic structure of Mn$_3$Si$_2$Te$_6$
Covalency, correlations, and inter-layer interactions governing the magnetic and electronic structure of Mn$_3$Si$_2$Te$_6$ Open
Mn$_3$Si$_2$Te$_6$ is a rare example of a layered ferrimagnet. It has recently been shown to host a colossal angular magnetoresistance as the spin orientation is rotated from the in- to out-of-plane direction, proposed to be underpinned by…
View article: Frustrated Magnet Mn3Al2Ge3O12 Garnet: Crystal Growth by the Optical Floating Zone Method
Frustrated Magnet Mn3Al2Ge3O12 Garnet: Crystal Growth by the Optical Floating Zone Method Open
Mn3Al2Ge3O12 is a member of the garnet family of compounds, A3B2(CO4)3, whose magnetic properties are affected by a high degree of geometrical frustration. The magnetic frustration is at the origin of the intriguing magnetic properties tha…
View article: ABSTRACTS FOR “14TH SCIENTIFIC SESSION OF UNDERGRADUATE, MASTERS AND PHD STUDENTS, IASI, ROMANIA”
ABSTRACTS FOR “14TH SCIENTIFIC SESSION OF UNDERGRADUATE, MASTERS AND PHD STUDENTS, IASI, ROMANIA” Open
An important part of the materials used in the everyday life are in polycrystalline form and most of them have been extracted from the earth's crust or synthesized using different synthesis methods.Using the approach of a chemist, we are l…
View article: Dielectric and transient electrical response of SmB6 single crystals
Dielectric and transient electrical response of SmB6 single crystals Open
View article: Singlet-triplet mixing in the order parameter of the noncentrosymmetric superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ru</mml:mi><mml:mn>7</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
Singlet-triplet mixing in the order parameter of the noncentrosymmetric superconductor Open
One of the key effects which is predicted to arise in superconductors without a center of inversion is the mixing of singlet and triplet order parameters, which are no longer good quantum numbers on their own due to parity.We have probed t…
View article: f-electron hybridised Fermi surface in magnetic field-induced metallic YbB12
f-electron hybridised Fermi surface in magnetic field-induced metallic YbB12 Open
View article: Magnetic structures of geometrically frustrated <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>SrGd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> derived from powder and single-crystal neutron diffraction
Magnetic structures of geometrically frustrated derived from powder and single-crystal neutron diffraction Open
We present the low-temperature magnetic structures of SrGd2O4 combining neutron diffraction methods on polycrystalline and single-crystal samples containing the 160Gd isotope. In contrast to other members of the SrLn2O4 family (Ln = lantha…
View article: Dielectric and Transient Electrical Response of Smb6 Single Crystals
Dielectric and Transient Electrical Response of Smb6 Single Crystals Open
View article: Direct measurement of a remnant Fermi surface in SmB6
Direct measurement of a remnant Fermi surface in SmB6 Open
The quest to understand the nature of the electronic state in SmB6 has been challenging, perplexing and surprising researchers for over half a century. In the theoretically predicted topological Kondo insulator SmB6, the nature of the bulk…
View article: Impedance Spectroscopy of SmB$_6$ single crystals
Impedance Spectroscopy of SmB$_6$ single crystals Open
We report results from an in--plane and out--of--plane impedance study on SmB$_6$ single crystals, performed at low temperatures and over a wide frequency range. A universal equivalent circuit describes the dielectric behavior of this syst…
View article: Absence of zero-field-cooled exchange bias effect in single crystalline <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>A</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CoMnO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>(</mml:mo><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mi>Ca</mml:mi><mml:mo>,</mml:mo><mml:mi>Sr</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> compounds
Absence of zero-field-cooled exchange bias effect in single crystalline compounds Open
Magnetic properties of A2BB'O6 (A = rare or alkaline earth ions; B,B' = transition metal ions) double perovskites are of great interest due to their potential spintronic applications. Particularly fascinating is the zero field cooled excha…
View article: Field-temperature phase diagram of the enigmatic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Nd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>Zr</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ti</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math> pyrochlore magnets
Field-temperature phase diagram of the enigmatic pyrochlore magnets Open
By combining neutron scattering and magnetization measurements down to 80 mK, we determine the (H, T ) phase diagram of the Nd2(Zr1−xTix )2O7 pyrochlore magnet compounds. In those samples, Zr is partially substituted by Ti, hence tuning th…
View article: Spin Dynamics and Unconventional Coulomb Phase in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Zr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Spin Dynamics and Unconventional Coulomb Phase in Open
We investigate the temperature dependence of the spin dynamics in the pyrochlore magnet Nd_{2}Zr_{2}O_{7} by neutron scattering experiments. At low temperature, this material undergoes a transition towards an "all-in-all-out" antiferromagn…
View article: Absence of zero-field-cooled exchange bias effect in single crystalline La2-xAxCoMnO6 (A = Ca, Sr) compounds
Absence of zero-field-cooled exchange bias effect in single crystalline La2-xAxCoMnO6 (A = Ca, Sr) compounds Open
Magnetic properties of A2BB'O6 (A = rare or alkaline earth ions; B,B' = transition metal ions) double perovskites are of great interest due to their potential spintronic applications. Particularly fascinating is the zero field cooled excha…
View article: Intrinsic one-dimensional conducting channels in the Kondo insulator SmB6
Intrinsic one-dimensional conducting channels in the Kondo insulator SmB6 Open
Since its discovery as a Kondo insulator 50 years ago, SmB6 recently received a revival of interest due to detection of unexpected quantum oscillations in the insulating state, discovery of disorder-immune bulk transport, and proposals of …