Md. Riad Kasem
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View article: Investigation of Superconducting Gap of High-Entropy Telluride AgInSnPbBiTe5
Investigation of Superconducting Gap of High-Entropy Telluride AgInSnPbBiTe5 Open
We performed transverse-field muon spin relaxation/rotation (TF- μ SR) on a high-entropy-type (HE-type) superconductor AgInSnPbBiTe 5 . The emergence of bulk superconducting states was confirmed from magnetic susceptibility, specific heat,…
View article: Specific heat analyses on optical-phonon-derived uniaxial negative thermal expansion system TrZr2 (Tr = Fe and Co1-xNix)
Specific heat analyses on optical-phonon-derived uniaxial negative thermal expansion system TrZr2 (Tr = Fe and Co1-xNix) Open
Recently, huge uniaxial negative thermal expansion (NTE) along a c-axis has been observed in transition-metal (Tr) zirconides TrZr2 with a tetragonal CuAl2-type structure. In a recent study on FeZr2 [M. Xu et al., Nat. Commun. 14, 4439 (20…
View article: Large self-heating by trapped-flux reduction in Sn-Pb solders
Large self-heating by trapped-flux reduction in Sn-Pb solders Open
Magnetic flux trapping in field-cooled (FC) Sn-Pb solders has been recently studied because of the observation of nonvolatile magneto-thermal switching ( Arima H. et al ., Commun. Mater. , 5 (2024) 34) and anomalous magnetic field-temperat…
View article: Specific heat analyses on optical-phonon-derived uniaxial negative thermal expansion system $Tr$Zr$_{2}$ ($Tr$ = Fe and Co$_{1-x}$Ni$_{x}$)
Specific heat analyses on optical-phonon-derived uniaxial negative thermal expansion system $Tr$Zr$_{2}$ ($Tr$ = Fe and Co$_{1-x}$Ni$_{x}$) Open
Recently, huge uniaxial negative thermal expansion (NTE) along a $c$-axis has been observed in transition-metal ($Tr$) zirconides $Tr$Zr$_{2}$ with a tetragonal CuAl$_{2}$-type structure. In a recent study on FeZr$_{2}$ [M. Xu et al., Nat.…
View article: Large self-heating by trapped-flux reduction in Sn-Pb solders
Large self-heating by trapped-flux reduction in Sn-Pb solders Open
Magnetic flux trapping in field-cooled (FC) Sn-Pb solders has been recently studied because of the observation of nonvolatile magneto-thermal switching [H. Arima et al., Commun. Mater. 5, 34 (2024)] and anomalous magnetic field-temperature…
View article: Observation of nonvolatile magneto-thermal switching in superconductors
Observation of nonvolatile magneto-thermal switching in superconductors Open
Applying a magnetic field to a solid changes its thermal-transport properties. Although such magneto-thermal-transport phenomena are usually small effects, giant magneto-thermal resistance has recently been observed in spintronic materials…
View article: Vortex formation and exotic superconducting states in field-cooled Sn-Pb solders
Vortex formation and exotic superconducting states in field-cooled Sn-Pb solders Open
Formation of vortices is a typical phenomenon of type-II superconductors under magnetic fields (H). In contrast, type-I superconductors do not host vortices because of their Meissner state. As rare cases, vortices have been observed in int…
View article: Stabilization of Bi vibration along c-axis in BiS<sub>2</sub>-based layered compounds La(O,F)Bi(S,Se)<sub>2</sub> by Se substitution
Stabilization of Bi vibration along c-axis in BiS<sub>2</sub>-based layered compounds La(O,F)Bi(S,Se)<sub>2</sub> by Se substitution Open
BiCh 2 -based layered compounds have been extensively studied as potential thermoelectric and unconventional superconducting materials. For both functionalities, in-plane chemical pressure effects improve their thermoelectric or supercondu…
View article: Observation of nonvolatile magneto-thermal switching in superconductors
Observation of nonvolatile magneto-thermal switching in superconductors Open
Applying a magnetic field to a solid changes its thermal-transport properties. Although such magneto-thermal-transport phenomena are usually small effects, giant magneto-thermal resistance has recently been observed in spintronic materials…
View article: Magneto-thermal-switching properties of superconducting Nb
Magneto-thermal-switching properties of superconducting Nb Open
Recently, thermal switching has been extensively studied because it is a key component for thermal management in electronic devices. Here, we show a huge magneto-thermal-switching ratio (MTSR) in pure Nb at temperatures lower than its supe…
View article: Axis thermal expansion switching in transition-metal zirconides TrZr<sub>2</sub> by tuning the c/a ratio
Axis thermal expansion switching in transition-metal zirconides TrZr<sub>2</sub> by tuning the c/a ratio Open
This study examines the temperature-dependent evolution of the lattice constants for various CuAl 2 -type compounds, including NiZr 2 , (Co,Rh,Ir)Zr 2 , (Fe,Co,Rh,Ir)Zr 2 , and (Co,Ni,Cu,Rh,Ir)Zr 2 , in the pursuit of negative or zero ther…
View article: Glassy atomic vibrations and blurry electronic structures created by local structural disorders in high-entropy metal telluride superconductors
Glassy atomic vibrations and blurry electronic structures created by local structural disorders in high-entropy metal telluride superconductors Open
Recently, robustness of superconductivity to external pressure has been observed in high-entropy (HE) metal telluride (MTe). Here, we investigated the atomic displacement parameters (Uiso), atomic vibration characteristics, and electronic …
View article: Axis thermal expansion switching in transition-metal zirconides TrZr2 by tuning the c/a ratio
Axis thermal expansion switching in transition-metal zirconides TrZr2 by tuning the c/a ratio Open
This study examines the temperature-dependent evolution of the lattice constants for various CuAl2-type compounds, including NiZr2, (Co,Rh,Ir)Zr2, (Fe,Co,Rh,Ir)Zr2, and (Co,Ni,Cu,Rh,Ir)Zr2, in the pursuit of negative or zero thermal expans…
View article: Glassy atomic vibrations and blurry electronic structures created by local structural disorders in high-entropy metal telluride superconductors
Glassy atomic vibrations and blurry electronic structures created by local structural disorders in high-entropy metal telluride superconductors Open
The motivation of this work is our recent observation of the robustness of superconductivity in a High-entropy (HE) superconductor Ag0.2In0.2Sn0.2Pb0.2Bi0.2Te (CsCl-type) to external pressure. The superconducting transition temperature (Tc…
View article: Superconductivity of high-entropy-alloy-type transition-metal zirconide (Fe,Co,Ni,Cu,Ga)Zr<sub>2</sub>
Superconductivity of high-entropy-alloy-type transition-metal zirconide (Fe,Co,Ni,Cu,Ga)Zr<sub>2</sub> Open
We synthesized a new high-entropy-alloy-type (HEA-type) superconductor (Fe,Co,Ni,Cu,Ga)Zr 2 with a T c of 2.9 K. The EDX analyses revealed that the actual composition of the transition-metal site ( Tr -site) is Tr = Fe 0.17(1) Co 0.18(2) N…
View article: Superconductivity of high-entropy-alloy-type transition-metal zirconide (Fe,Co,Ni,Cu,Ga)Zr2
Superconductivity of high-entropy-alloy-type transition-metal zirconide (Fe,Co,Ni,Cu,Ga)Zr2 Open
We synthesized a new high-entropy-alloy-type (HEA-type) superconductor (Fe,Co,Ni,Cu,Ga)Zr2 with a Tc of 2.9 K. The EDX analyses revealed that the actual composition of the transition-metal site (Tr-site) is Tr = Fe0.18Co0.18Ni0.16Cu0.25Ga0…
View article: Anomalous thermal expansion in a CuAl2-type superconductor CoZr2
Anomalous thermal expansion in a CuAl2-type superconductor CoZr2 Open
In this work, we show that the CuAl2-type superconductor CoZr2 and alloyed systems exhibit anomalous thermal expansion in a wide temperature range. We performed neutron powder diffraction and X-ray powder diffraction on CoZr2 and observed …
View article: Material Development of High-Entropy-Alloy-Type Superconductors and Investigation of Physical Properties under High Pressure
Material Development of High-Entropy-Alloy-Type Superconductors and Investigation of Physical Properties under High Pressure Open
Since the discovery of superconductivity in a high-entropy alloy (HEA) Ti-Zr-Hf-Nb-Ta, we have developed HEA-type superconductors based on various electronic materials. Since compounds basically possess two or more crystallographic sites a…
View article: Robustness of superconductivity to external pressure in high-entropy-alloy-type metal telluride AgInSnPbBiTe<sub>5</sub>.
Robustness of superconductivity to external pressure in high-entropy-alloy-type metal telluride AgInSnPbBiTe<sub>5</sub>. Open
High-entropy-alloy (HEA) superconductors are a new class of disordered superconductors. However, commonality of superconducting characteristics of HEA materials is unclear. Here, we have investigated the crystal and electronic structure, a…
View article: Estimation of the Grüneisen Parameter of High-Entropy Alloy-Type Functional Materials: The Cases of REO0.7F0.3BiS2 and MTe
Estimation of the Grüneisen Parameter of High-Entropy Alloy-Type Functional Materials: The Cases of REO0.7F0.3BiS2 and MTe Open
In functional materials such as thermoelectric materials and superconductors, the interplay between functionality, electronic structure, and phonon characteristics is one of the key factors to improve functionality and to understand the un…
View article: Tuning of Carrier Concentration and Superconductivity in High-Entropy-Alloy-Type Metal Telluride (AgSnPbBi)(1-x)/4InxTe
Tuning of Carrier Concentration and Superconductivity in High-Entropy-Alloy-Type Metal Telluride (AgSnPbBi)(1-x)/4InxTe Open
High-entropy-alloy-type (HEA-type) compound superconductors have been drawing much attention as a new class of exotic superconductors with local structural inhomogeneity. NaCl-type (Ag,In,Sn,Pb,Bi)Te is a typical HEA-type superconductor, b…
View article: Superconductivity in In-doped AgSnBiTe3 with possible band inversion
Superconductivity in In-doped AgSnBiTe3 with possible band inversion Open
We investigated the chemical pressure effects on structural and electronic properties of SnTe-based material using partial substitution of Sn by Ag0.5Bi0.5, which results in lattice shrinkage. For Sn1-2x(AgBi)xTe, single-phase polycrystall…
View article: Superconductivity in In-doped AgSnBiTe3 with possible band inversion
Superconductivity in In-doped AgSnBiTe3 with possible band inversion Open
We investigated the chemical pressure effects on structural and electronic properties of SnTe-based material using partial substitution of Sn by Ag0.5Bi0.5, which results in lattice shrinkage. For Sn1-2x(AgBi)xTe, single-phase polycrystall…
View article: Anomalous broadening of specific heat jump at Tc in high-entropy-alloy-type superconductor TrZr2
Anomalous broadening of specific heat jump at Tc in high-entropy-alloy-type superconductor TrZr2 Open
A high-entropy-alloy-type (HEA-type) superconductor is new category of highly disordered superconductors. Therefore, finding brand-new superconducting characteristics in the HEA-type superconductors would open new avenue to investigate the…
View article: Superconducting properties of high-entropy-alloy tellurides M-Te (M: Ag, In, Cd, Sn, Sb, Pb, Bi) with a NaCl-type structure
Superconducting properties of high-entropy-alloy tellurides M-Te (M: Ag, In, Cd, Sn, Sb, Pb, Bi) with a NaCl-type structure Open
High-entropy-alloy-type tellurides M-Te, which contain five different metals\nof M = Ag, In, Cd, Sn, Sb, Pb, and Bi, were synthesized using high pressure\nsynthesis. Structural characterization revealed that all the obtained samples\nhave …