Low-Dimensional Critical Behaviors and Competition Between Order Parameters in the Organic Metal (Tmtsf)2ClO4

1989 ◽  
Vol 173 ◽  
Author(s):  
F. Pesty ◽  
P. Garoche ◽  
M. Heritier
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Specific Heat ◽  
High Field ◽  
Density Wave ◽  
Second Order ◽  
Metallic State ◽  
Transition Line ◽  
One Dimensional ◽  
Low Dimensional

ABSTRACTIn low-dimensional conductors, the instability of the metallic state can lead to the formation at low temperature of a spin density wave induced by the magnetic field (FISDW). The transition results from the complex interplay between the one dimensional instability of the electronic gas and the quantization of the magnetic field’s flux. This second-order phase-transition line has been investigated by measuring both specific heat and thermal conductivity along the c* direction. The mean-field jump and the gap value have been deduced respectively from the anomaly and the exponential decay of the electronic specific heat. The coupling strength λ has been evaluated, and the λ > 0.3 value indicates clearly a strong coupling behavior at high field. Below 8 teslas, the specific heat displays a double anomaly in relation with the competition between subphases. Above the second-order transition line, critical fluctuations are observed on both specific heat and lattice thermal conductivity. Along this line, one-dimensional fluctuations increase with increasing magnetic field. It is proposed that the very high field reentrance of the metal is to be related to enhancement of the 1D fluctuations.

High Magnetic Field Phases of the (TMTSF)2X (X = CLO4, PF6) Charge Transfer Complexes

1989 ◽  
Vol 173 ◽  
Author(s):  
J. S. Brooks ◽  
N. A. Fortune ◽  
P. M. Chaikin ◽  
L. Y. Chiang ◽  
G. Montambaux ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Charge Transfer ◽  
Magnetic Fields ◽  
Specific Heat ◽  
Low Temperatures ◽  
Density Wave ◽  
Spin Density Wave ◽  
Metallic State ◽  
Low Field ◽  
Fast Oscillations

ABSTRACTThe purpose of this talk is to discuss the physical properties of the (TMTSF)2X charge transfer salts in high magnetic fields. This class of materials is of great interest since the effective lower dimensionality and the various ground states are magnetic field dependent at low temperatures. At present, the so-called “standard model” provides a good theoretical description of the low field field induced spin density wave transitions (FISDW). However the reentrance from the last FISDW back to a high field metallic state, and the coexistence of “fast oscillations” in all measured properties, is yet to be accurately described theoretically. The emphasis of this paper is on recent specific heat results which have been obtained on (TMTSF)2ClO4 in magnetic fields as high as 30 T. Here we observe both the reentrant phase transition and the fast oscillations in the specific heat. A main conclusion we draw from our measurements is that the density of states in the reentrant phase is less than it is in the low field metallic state at low temperatures.

Study of Thermal Conductivity due to Spins in One-Dimensional Spin Systems AFeX3 (A=Rb, Cs; X=Cl, Br)

2015 ◽  
Vol 827 ◽  
pp. 243-247
Author(s):  
Riesma Tasomara ◽  
T. Kawamata ◽  
Y. Matsuoka ◽  
H. Sudo ◽  
K. Naruse ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Magnetic Fields ◽  
Spin Systems ◽  
Zero Field ◽  
One Dimensional ◽  
Conducting Materials ◽  
Thermal Conducting ◽  
Low Dimensional ◽  
Two Peaks

Large contributions of the thermal conductivity due to spins, κspin, in low-dimensional spin systems are expected to be utilized as highly thermal conducting materials. One-dimensional spin system RbFeCl3 with ferromagnetic chains and CsFeBr3 with antiferromagnetic chains in magnetic fields have been prepared in order to observe the contribution of κspin to the value of thermal conductivity. The temperature dependence of the thermal conductivity parallel to spin chains along the c-axis, κ//c, of RbFeCl3 enhanced around 3 K and 10 K by the application of magnetic field. In the thermal conductivity perpendicular to c-axis, κ⊥c, of RbFeCl3, on the other hand, it has been found that only one peak around 3 K is enhanced by the application of magnetic field. Since κ⊥c is mainly owing to the thermal conductivity due to phonons, κphonon, it has been concluded the peak of κ//c around 10 K in magnetic fields is due to the contribution of κspin. For CsFeBr3, it has been found that κ//c shows two peaks around 3 K and 25 K while κ⊥c shows one peak around 12 K in zero field. This indicates that there is a marked contribution of κspin to κ//c. κ⊥ However, the details of the marked contribution of κspin to κ//c are not yet clear, since κ//c has been suppressed by the application of magnetic field in contrast with the enhancement of the thermal conductivity in RbFeCl3.

Magnetic Evidence for Reentrant Field-Induced Spin Density Waves

1989 ◽  
Vol 173 ◽  
Author(s):  
M. J. Naughton ◽  
R. V. Chamberlin ◽  
X. Yan ◽  
P. M. Chaikin ◽  
L. Y. Chiang
Keyword(s):  
Magnetic Field ◽  
Spin Density ◽  
High Field ◽  
Density Wave ◽  
Spin Density Wave ◽  
Metallic Phase ◽  
Wave State ◽  
T Phase ◽  
Resistance Data ◽  
The Magnetic Field

ABSTRACTHigh magnetic field (to 31T) d.c. magnetization measurements on the quasi-one dimensional organic conductor (TMTSF) 2ClO4 yield thermodynamic evidence for the reentrance of a metallic phase from the magnetic field-induced spin density wave state. The H-T phase diagram developed previously from magnetotransport measurements is reproduced from 8 to 26 tesla. The reentrance occurs as a sharp collapse of M(H) to (near) zero magnetization in the high field metal phase. For fields above 27 tesla, deHaas-van Alphen-like oscillations appear, similar to earlier resistance data, as well as other features possibly signifying multiple transitions in the very high field regime.

scholarly journals Structures and physical properties of v-based kagome metals csv6sb6 and csv8sb12 *

2021 ◽  
Vol 38 (12) ◽  
pp. 127401
Author(s):  
Qiangwei Yin ◽  
Zhijun Tu ◽  
Chunsheng Gong ◽  
Shangjie Tian ◽  
Hechang Lei
Keyword(s):  
Charge Density Wave ◽  
High Field ◽  
Density Wave ◽  
Orthorhombic Symmetry ◽  
Two Dimensional ◽  
Wave State ◽  
New Members ◽  
One Dimensional ◽  
Topological Materials ◽  
Linear Field

We report two new members of V-based kagome metals CsV6Sb6 and CsV8Sb12. The most striking structural feature of CsV6Sb6 is the V kagome bilayers. For CsV8Sb12, there is an intergrowth of two-dimensional V kagome layers and one-dimensional V chains, and the latter ones lead to the orthorhombic symmetry of this material. Further measurements indicate that these two materials exhibit metallic and Pauli paramagnetic behaviors. More importantly, different from CsV3Sb5, the charge density wave state and superconductivity do not emerge in CsV6Sb6 and CsV8Sb12 when temperature is above 2 K. Small magnetoresistance with saturation behavior and linear field dependence of Hall resistivity at high field and low temperature suggest that the carriers in both materials should be uncompensated with much different concentrations. The discovery of these two new V-based kagome metals sheds light on the exploration of correlated topological materials based on kagome lattice.

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