J. Valenta
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View article: Suppression of ferromagnetism in van der Waals insulator due to pressure-induced layer stacking variation
Suppression of ferromagnetism in van der Waals insulator due to pressure-induced layer stacking variation Open
External pressure suppresses the ferromagnetism of localized Cr 3d electron moments in the van der Waals insulator CrBr3, which cannot be explained without considering a dramatic pressure-induced crystal or electronic structure change. We …
View article: Phase transitions and slow spin dynamics of slightly inverted A-site spinel CoAl<sub>2−<i>x</i> </sub>Ga<i> <sub>x</sub> </i>O<sub>4</sub>
Phase transitions and slow spin dynamics of slightly inverted A-site spinel CoAl<sub>2−<i>x</i> </sub>Ga<i> <sub>x</sub> </i>O<sub>4</sub> Open
We report the properties of an A-site spinel magnet, CoAl 2− x Ga x O 4 , and analyze its anomalous, low-temperature magnetic behavior, which is derived from inherent, magnetically frustrated interactions. Rietveld analysis of the x-ray di…
View article: Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity
Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity Open
We investigate vortex matter in a proximity-coupled $\mathrm{Mg}/\mathrm{MgO}/\mathrm{Mg}{\mathrm{B}}_{2}$ nanocomposite with $\ensuremath{\sim}30$ vol. % of $\mathrm{Mg}{\mathrm{B}}_{2}$ using magneto-optical imaging, scanning superconduc…
View article: Evaluation of insulating behavior by Pb substitution and pressure-induced superconductivity in La<sub>2</sub>O<sub>2</sub>Bi<sub>3−</sub> <i> <sub>x</sub> </i>Pb<sub>1+</sub> <i> <sub>x</sub> </i>S<sub>6</sub>
Evaluation of insulating behavior by Pb substitution and pressure-induced superconductivity in La<sub>2</sub>O<sub>2</sub>Bi<sub>3−</sub> <i> <sub>x</sub> </i>Pb<sub>1+</sub> <i> <sub>x</sub> </i>S<sub>6</sub> Open
We report synthesis, characterization, and physical properties of layered bismuth-sulfide compounds La 2 O 2 Bi 3− x Pb 1+ x S 6 . We synthesized a new La 2 O 2 Bi 3 PbS 6 compound, whose crystal structure is similar to those of the La 2 O…
View article: Unusually strong electronic correlation and field-induced ordered phase in YbCo<sub>2</sub>
Unusually strong electronic correlation and field-induced ordered phase in YbCo<sub>2</sub> Open
We report the first study of electrical resistivity, magnetization, and specific heat on YbCo 2 . The measurements on a single-phased sample of YbCo 2 bring no evidence of magnetic ordering down to 0.3 K in a zero magnetic field. The manif…
View article: Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity
Strong phase coherence and vortex matter in a fractal system with proximity-induced superconductivity Open
The proximity effect in normal/superconductor heterostructures is an intriguing phenomenon in that the normal side takes on the properties of a superconductor with an induced gap. However, the structural and pinning properties of vortices …
View article: Slow spin dynamics in a CoM<sub>2</sub>O<sub>4</sub> A-site spinel (M=Al, Ga, and Rh)
Slow spin dynamics in a CoM<sub>2</sub>O<sub>4</sub> A-site spinel (M=Al, Ga, and Rh) Open
We report thermomagnetic properties in magnetically frustrated A-site spinel magnets of CoAl 2 O 4 , CoRh 2 O 4 , and cluster glass CoGa 2 O 4 to comprehensively show the proximity effects of the Néel-to-spin-spiral (NSS) transition, which…
View article: The low and high temperature thermoelectric properties of Yb<sub>3</sub>Si<sub>5</sub>
The low and high temperature thermoelectric properties of Yb<sub>3</sub>Si<sub>5</sub> Open
Silicides have been of great interest for thermoelectric applications due to their abundant elements as well as thermal and chemical stability. In this paper, we examined the thermoelectric properties of Yb 3 Si 5 polycrystalline samples i…
View article: Pressure induced superconductivity in a CeRhSi <sub>3</sub> single crystal—the high pressure study
Pressure induced superconductivity in a CeRhSi <sub>3</sub> single crystal—the high pressure study Open
Pressure induced superconductivity in non-centrosymmetric CeRhSi 3 and CeIrSi 3 compounds has attracted significant attention of the scientific community since its discovery 15 years ago. Up-to-date, all reported experimental results were …
View article: Chemical and physical pressure effects in the A-site spinel antiferromagnets CoM<sub>2</sub>O<sub>4</sub> (M = Al, Co, and Rh)
Chemical and physical pressure effects in the A-site spinel antiferromagnets CoM<sub>2</sub>O<sub>4</sub> (M = Al, Co, and Rh) Open
Magnetic phase transitions under high pressure are reported for the diamond lattice antiferromagnet Co 3−x Rh x O 4 in the range of 0 ≤ x ≤ 2.0, which is an isostructural S = 3/2 system for the well-known frustrated antiferromagnet CoAl 2 …
View article: Antiferromagnetism and phase transitions in non-centrosymmetric UIrSi$_3$
Antiferromagnetism and phase transitions in non-centrosymmetric UIrSi$_3$ Open
Magnetization and specific heat measurements on a UIrSi3 single crystal reveal Ising-like antiferromagnetism below T$_N$ = 41.7 K with easy magnetization direction along the c-axis of tetragonal structure. The antiferromagentic ordering is…
View article: Antiferromagnetism and phase transitions in non-centrosymmetric\n UIrSi$_3$
Antiferromagnetism and phase transitions in non-centrosymmetric\n UIrSi$_3$ Open
Magnetization and specific heat measurements on a UIrSi3 single crystal\nreveal Ising-like antiferromagnetism below T$_N$ = 41.7 K with easy\nmagnetization direction along the c-axis of tetragonal structure. The\nantiferromagentic ordering…
View article: Electrical resistivity across the tricriticality in itinerant ferromagnet
Electrical resistivity across the tricriticality in itinerant ferromagnet Open
We investigate the discontinuous ferromagnetic phase diagram near tricritical point in UCo1-xRuxAl compounds by electrical resistivity measurements. Separation of phases in UCo0.995Ru0.005Al at ambient pressure and in UCo0.990Ru0.010Al at …
View article: Characterisation of irradiation-induced defects in ZnO single crystals
Characterisation of irradiation-induced defects in ZnO single crystals Open
Positron annihilation spectroscopy (PAS) combined with optical methods was employed for characterisation of defects in the hydrothermally grown ZnO single crystals irradiated by 167 MeV Xe26+ ions to fluences ranged from 3×1012 to 1×1014 c…