scholarly journals Superconductivity in CuIr2-x Al x Te4 telluride chalcogenides

2021 ◽  
Author(s):  
Dong Yan ◽  
Lingyong Zeng ◽  
Yijie Zeng ◽  
Yishi Lin ◽  
Junjie Yin ◽  
...  
Keyword(s):  
Charge Density Wave ◽  
Condensed Matter ◽  
Density Wave ◽  
Superconducting Transition ◽  
Doping Amount ◽  
Al Doping ◽  
The Past ◽  
Maximum Value ◽  
Specific Heat Jump ◽  
The Relationship

Abstract The relationship between charge-density-wave (CDW) and superconductivity (SC), two vital physical phases in condensed matter physics, has always been the focus of scientists' research over the past decades. Motivated by this research hotspot, we systematically studied the physical properties of the layered telluride chalcogenide superconductors CuIr2-x Al x Te4 (0 ≤ x ≤ 0.2). Through the resistance and magnetization measurements, we found that the CDW order was destroyed by a small amount of Al doping. Meanwhile, the superconducting transition temperature (T c ) kept changing with the change of doping amount and rose towards the maximum value of 2.75 K when x = 0.075. The value of normalized specific heat jump (ΔC/γT c ) for the highest T c sample CuIr1.925Al0.075Te4 was 1.53, which was larger than the BCS value of 1.43 and showed that bulk superconducting nature. In order to clearly show the relationship between SC and CDW states, we propose a phase diagram of T c vs. doping content.

scholarly journals Pressure-induced enhancement of the superconducting transition temperature in La2O2Bi3AgS6

2021 ◽  
Author(s):  
Esteban I. Paredes Aulestia ◽  
Xinyou Liu ◽  
Yiu Yung Pang ◽  
Chun Wa So ◽  
Wing Chi Yu ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Charge Density Wave ◽  
Ambient Pressure ◽  
Density Wave ◽  
Transition Metal Dichalcogenides ◽  
Superconducting Transition ◽  
Resistivity Measurements ◽  
Maximum Value ◽  
Metal Dichalcogenides ◽  
Pressure Phase

Abstract Charge density wave (CDW) instability is often found in phase diagrams of superconductors such as cuprates and certain transition-metal dichalcogenides. This proximity to superconductivity triggers the question on whether CDW instability is responsible for the pairing of electrons in these superconductors. However, this issue remains unclear and new systems are desired to provide a better picture. Here, we report the temperature-pressure phase diagram of a recently discovered BiS2 superconductor La2O2Bi3AgS6, which shows a possible CDW transition at T* ∽155 K and a superconducting transition at Tc ∽1.0 K at ambient pressure, via electrical resistivity measurements. Upon applying pressure, T* decreases linearly and extrapolates to 0 K at 3.9 GPa. Meanwhile, Tc is enhanced and reaches maximum value of 4.1 K at 3.1 GPa, forming a superconducting dome in the temperature-pressure phase diagram.

scholarly journals Chiral superconductivity in the alternate stacking compound 4Hb-TaS2

2020 ◽  
Vol 6 (13) ◽  
pp. eaax9480 ◽  
Author(s):  
A. Ribak ◽  
R. Majlin Skiff ◽  
M. Mograbi ◽  
P. K. Rout ◽  
M. H. Fischer ◽  
...  
Keyword(s):  
Ground State ◽  
Time Reversal ◽  
Charge Density Wave ◽  
Density Wave ◽  
Spin Liquid ◽  
Strongly Correlated ◽  
Superconducting Transition ◽  
Wave State ◽  
Two Dimensional Materials ◽  
Different Types

Van der Waals materials offer unprecedented control of electronic properties via stacking of different types of two-dimensional materials. A fascinating frontier, largely unexplored, is the stacking of strongly correlated phases of matter. We study 4Hb-TaS2, which naturally realizes an alternating stacking of 1T-TaS2 and 1H-TaS2 structures. The former is a well-known Mott insulator, which has recently been proposed to host a gapless spin-liquid ground state. The latter is a superconductor known to also host a competing charge density wave state. This raises the question of how these two components affect each other when stacked together. We find a superconductor with a Tc of 2.7 Kelvin and anomalous properties, of which the most notable one is a signature of time-reversal symmetry breaking, abruptly appearing at the superconducting transition. This observation is consistent with a chiral superconducting state.

PHASE SOLITONS IN THE PEIERLS-FROLICH MODEL AND E-E INTERACTION

1987 ◽  
Vol 01 (05n06) ◽  
pp. 207-216
Author(s):  
A.V. Balatsky ◽  
S.I. Matveenko
Keyword(s):  
Charge Density ◽  
Electric Charge ◽  
Charge Density Wave ◽  
Density Wave ◽  
The Relationship

The electric charge of the phase soliton in the Peierls dielectric is calculated when e-e interaction is present. It is shown that the value of the charge is connected with the change of the phase of the charge density wave on the soliton ∆æ by the relationship q=∆æ/2π(1 +δ) where δ is a constant of scattering forward.

scholarly journals Unusual competition of superconductivity and charge-density-wave state in a compressed topological kagome metal

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
F. H. Yu ◽  
D. H. Ma ◽  
W. Z. Zhuo ◽  
S. Q. Liu ◽  
X. K. Wen ◽  
...  
Keyword(s):  
Charge Density ◽  
Electrical Transport ◽  
Charge Density Wave ◽  
Condensed Matter ◽  
Density Wave ◽  
Residual Resistivity ◽  
Double Peak ◽  
Wave State ◽  
Quantum Oscillations ◽  
Nontrivial Topology

AbstractUnderstanding the competition between superconductivity and other ordered states (such as antiferromagnetic or charge-density-wave (CDW) state) is a central issue in condensed matter physics. The recently discovered layered kagome metal AV3Sb5 (A = K, Rb, and Cs) provides us a new playground to study the interplay of superconductivity and CDW state by involving nontrivial topology of band structures. Here, we conduct high-pressure electrical transport and magnetic susceptibility measurements to study CsV3Sb5 with the highest Tc of 2.7 K in AV3Sb5 family. While the CDW transition is monotonically suppressed by pressure, superconductivity is enhanced with increasing pressure up to P1 ≈ 0.7 GPa, then an unexpected suppression on superconductivity happens until pressure around 1.1 GPa, after that, Tc is enhanced with increasing pressure again. The CDW is completely suppressed at a critical pressure P2 ≈ 2 GPa together with a maximum Tc of about 8 K. In contrast to a common dome-like behavior, the pressure-dependent Tc shows an unexpected double-peak behavior. The unusual suppression of Tc at P1 is concomitant with the rapidly damping of quantum oscillations, sudden enhancement of the residual resistivity and rapid decrease of magnetoresistance. Our discoveries indicate an unusual competition between superconductivity and CDW state in pressurized kagome lattice.

QUASI-ONE-DIMENSIONAL SUPERCONDUCTIVITY IN Sc5Ir4Si10 AND Lu5Ir4Si10 SINGLE CRYSTALS

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3334-3339 ◽  
Author(s):  
T. TAMEGAI ◽  
G. J. LI
Keyword(s):  
Fermi Surface ◽  
Charge Density ◽  
Single Crystals ◽  
Charge Density Wave ◽  
Density Wave ◽  
Anisotropy Parameter ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Subtle Difference ◽  
One Dimensional

Anisotropic superconducting properties in Sc 5 Ir 4 Si 10 and Lu 5 Ir 4 Si 10 single crystals are investigated. Both of these compounds are found to show quasi-one-dimensional superconductivity with better conduction along the c-axis and anisotropy parameter of about 2. Reflecting the partial destruction of the Fermi surface due to charge-density-wave formation, Lu 5 Ir 4 Si 10 shows higher residual resistivity, lower superconducting transition temperature, and longer magnetic penetration depths compared with those of Sc 5 Ir 4 Si 10. Similarity of superconducting properties including the anisotropy in Sc 5 Ir 4 Si 10 and Lu 5 Ir 4 Si 10 indicates that the absence of the charge-density wave in Sc 5 Ir 4 Si 10 is controlled by a subtle difference in the Fermi surface topologies in these two compounds.

Charge density wave, superconductivity, and non-metallic behaviour under high pressure in ZrTe3

2002 ◽  
Vol 12 (9) ◽  
pp. 97-98
Author(s):  
K. Igarashi ◽  
S. Yasuzuka ◽  
K. Inagaki ◽  
S. Tanda ◽  
Y. Okajima ◽  
...  
Keyword(s):  
High Pressure ◽  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
High Pressures ◽  
Density Wave ◽  
Metallic State ◽  
Resistivity Measurements ◽  
Low Dimensional ◽  
The Relationship

The charge-density-wave (CDW) order of low-dimensional inorganic conductor ZrTe3 is found to increase with increasing pressure, while the superconductivity with filamentary nature is significantly suppressed. It was evidenced in resistivity measurements under pressure up to 0.8 Cpa. The present results suggest that competition between the superconductivity and the CDW is not simply explained by a nesting effect of the Fermi surface, but other origin is needed. Non-metallic behaviour is also found below 4 K under high pressures above 0.6 Gpa. The relationship between the non-metallic state and the pressure-enhanced CDW is expected, although yet inexplicable.

scholarly journals Nonequilibrium dynamics of spontaneous symmetry breaking into a hidden state of charge-density wave

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Faran Zhou ◽  
Joseph Williams ◽  
Shuaishuai Sun ◽  
Christos D. Malliakas ◽  
Mercouri G. Kanatzidis ◽  
...  
Keyword(s):  
Charge Density ◽  
Long Range ◽  
Charge Density Wave ◽  
Condensed Matter ◽  
Density Wave ◽  
Topological Defects ◽  
Intense Laser ◽  
Nonequilibrium Dynamics ◽  
Spontaneous Transformation ◽  
Long Range Correlations

AbstractNonequilibrium phase transitions play a pivotal role in broad physical contexts, from condensed matter to cosmology. Tracking the formation of nonequilibrium phases in condensed matter requires a resolution of the long-range cooperativity on ultra-short timescales. Here, we study the spontaneous transformation of a charge-density wave in CeTe3 from a stripe order into a bi-directional state inaccessible thermodynamically but is induced by intense laser pulses. With ≈100 fs resolution coherent electron diffraction, we capture the entire course of this transformation and show self-organization that defines a nonthermal critical point, unveiling the nonequilibrium energy landscape. We discuss the generation of instabilities by a swift interaction quench that changes the system symmetry preference, and the phase ordering dynamics orchestrated over a nonadiabatic timescale to allow new order parameter fluctuations to gain long-range correlations. Remarkably, the subsequent thermalization locks the remnants of the transient order into longer-lived topological defects for more than 2 ns.

scholarly journals Unusual competition of superconductivity and charge-density-wave state in a compressed topological kagome metal

2021 ◽  
Author(s):  
Fanghang Yu ◽  
Donghui Ma ◽  
Weizhuang Zhuo ◽  
Shiqiu Liu ◽  
Xikai Wen ◽  
...  
Keyword(s):  
Charge Density ◽  
Electrical Transport ◽  
Charge Density Wave ◽  
Condensed Matter ◽  
Density Wave ◽  
Residual Resistivity ◽  
Quantum Oscillation ◽  
Wave State ◽  
Lifshitz Transition ◽  
Nontrivial Topology

Abstract Understanding the competition between superconductivity and other ordered states (such as antiferromagnetic or charge-density-wave (CDW) state) is a central issue in condensed matter physics. The recently discovered layered kagome metal AV3Sb5 (A = K, Rb, and Cs) provides us a new playground to study the interplay of superconductivity and CDW state by involving nontrivial topology of band structures. Here, we present high-pressure electrical transport measurements for CsV3Sb5 with the highest Tc of 2.7 K in AV3Sb5 family. The CDW transition is monotonically suppressed by pressure, while superconductivity is enhanced with increasing pressure up to P1 ≈0.7 GPa, then an unexpected suppression on superconductivity happens until pressure around 1.2 GPa. The CDW is completely suppressed at a critical pressure P2≈2 GPa together with a maximum Tc of about 8 K. In contrast to a common dome-like behavior, the pressure-dependent Tc shows an unexpected double-peak behavior. The unusual suppression of Tc at P1 is linked to a Lifshitz transition of Fermi surface evidenced by quantum oscillation experiment, a sudden enhancement of the residual resistivity and a rapid decrease of magnetoresistance. A possible nearly commensurate CDW state involving the formation of CDW domain wall has been used to account for the Lifshitz transition. Our discoveries indicate an unusual competition between superconductivity and CDW state in pressurized kagome lattice.

Sign in / Sign up

Export Citation Format

Share Document