Magnetic-Field-Induced Metallic State in β-US2

2011 ◽  
Vol 80 (Suppl.A) ◽  
pp. SA104 ◽  
Author(s):  
Kiyohiro Sugiyama ◽  
Yusuke Hirose ◽  
Kentaro Enoki ◽  
Shugo Ikeda ◽  
Etsuji Yamamoto ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Metallic State

scholarly journals Universal behavior of the bosonic metallic ground state in a two-dimensional superconductor

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Zhuoyu Chen ◽  
Bai Yang Wang ◽  
Adrian G. Swartz ◽  
Hyeok Yoon ◽  
Yasuyuki Hikita ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Diagram ◽  
Quantum Phase Transitions ◽  
Metallic State ◽  
Two Dimensional ◽  
Metallic Behavior ◽  
Universal Behavior ◽  
Hall Resistivity ◽  
Wide Range ◽  
Metal State

AbstractAnomalous metallic behavior, marked by a saturating finite resistivity much lower than the Drude estimate, has been observed in a wide range of two-dimensional superconductors. Utilizing the electrostatically gated LaAlO3/SrTiO3 interface as a versatile platform for superconductor-metal quantum phase transitions, we probe variations in the gate, magnetic field, and temperature to construct a phase diagram crossing from superconductor, anomalous metal, vortex liquid, to the Drude metal state, combining longitudinal and Hall resistivity measurements. We find that the anomalous metal phases induced by gating and magnetic field, although differing in symmetry, are connected in the phase diagram and exhibit similar magnetic field response approaching zero temperature. Namely, within a finite regime of the anomalous metal state, the longitudinal resistivity linearly depends on the field while the Hall resistivity diminishes, indicating an emergent particle-hole symmetry. The universal behavior highlights the uniqueness of the quantum bosonic metallic state, distinct from bosonic insulators and vortex liquids.

A magnetic field sensitive interfacial metallic state in a crystalline insulator

2008 ◽  
Vol 19 (30) ◽  
pp. 305401 ◽  
Author(s):  
Vladimir Y Butko ◽  
Haiyan Wang ◽  
David Reagor
Keyword(s):  
Magnetic Field ◽  
Metallic State

scholarly journals Quenching of the 2D Metallic State by Aligning the Electron Spins

2000 ◽  
Vol 53 (4) ◽  
pp. 537
Author(s):  
J. S. Thakur ◽  
D. Neilson
Keyword(s):  
Magnetic Field ◽  
Phase Boundary ◽  
Memory Function ◽  
Metallic State ◽  
Correlation Effects ◽  
Parallel Magnetic Field ◽  
Metal Insulator ◽  
Conducting Phase ◽  
Exchange Correlation ◽  
Spin Polarisation

We discuss the destabilisation of the electron 2D metallic state by an in-plane magnetic field. We demonstrate that such a field can destabilise the metallic state through spin polarisation which significantly enhances the exchange correlations between electrons. We find that the conducting phase of the fully spin polarised system is almost completely suppressed. We discuss this phenomenon within a memory function formalism which treats both disorder and exchange-correlation effects. We determine the shift in the position of the metal–insulator phase boundary as the system is polarised by an increasing parallel magnetic field.

THE EFFECTS OF PRESSURE AND MAGNETIC FIELD ON THE CONDUCTIVITY OF FeCl4 DOPED POLYACETYLENE: THE INFLUENCE OF SCATTERING BY LOW-ENERGY EXCITATIONS

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3097-3100
Author(s):  
A. N. ALESHIN ◽  
T. J. KIM ◽  
D.-S. SUH ◽  
Y. W. PARK ◽  
H. KANG ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Pressure ◽  
Hydrostatic Pressure ◽  
Ambient Pressure ◽  
Weak Localization ◽  
Low Energy ◽  
Metallic State ◽  
Dephasing Time ◽  
Two Level Systems ◽  
Resistivity Minimum

The effects of hydrostatic pressure and magnetic field on the conductivity of oriented polyacetylene films doped with FeCl 4- up to metallic state have been studied at T = 0.35-300 K. It was found that application of pressure up to 10 kBar increases the conductivity at 300 K by a factor of 1.3 and suppresses the resistivity minimum in ρ (T) at 270 - 280 K. At T < 2 K the temperature dependence of resistivity ρ (T) ~ ln T (at ambient pressure and at 10 kBar) which remains unaltered by a magnetic field up to 14 Tesla. Transverse magnetoresistance (MR) was found to be negative, linear and temperature independent at T < 2 K (at ambient and high pressure). We attribute the observed ρ (T) and MR behavior to weak localization accompanied by effect of electron dephasing time saturation due to scattering by two-level systems of a special type. More strong behavior of ρ (T) and MR at T > 2 K related to further suppression of weak localization due to scattering by low-energy excitations of a "glassy" type.

scholarly journals New Reentrant Insulating Phases in Strongly Interacting 2D Systems with Low Disorder

2018 ◽  
Author(s):  
Richard L.J. Qiu ◽  
Chieh-Wen Liu ◽  
Shuhao Liu ◽  
Xuan P.A. Gao
Keyword(s):  
Magnetic Field ◽  
Oxide Semiconductor ◽  
Future Research ◽  
Metallic State ◽  
Zero Field ◽  
Strongly Correlated ◽  
Strongly Interacting ◽  
Intermediate Phases ◽  
Experimental Findings ◽  
Low Magnetic Field

The apparent metal-insulator transition (MIT) in two-dimension (2D) was discovered by Kravchenko et al. [1] more than two decades ago in strongly interacting 2D electrons residing in a Si-metal-oxide-semiconductor field-effect transistor (Si-MOSFET). Its origin remains unresolved. Recently, low magnetic field reentrant insulating phases (RIPs), which dwell between the zero-field (B=0) metallic state and the integer quantum Hall (QH) states where the Landau-level filling factor &upsilon; &gt; 1, have been observed in strongly correlated 2D GaAs hole systems with large interaction parameter rs (~20-40) and high purity. A new complex phase diagram was proposed, which includes zero field MIT, low magnetic field RIPs, integer QH states, fractional QH states, high field RIPs and insulating phases (HFIPs) with &upsilon; &lt; 1 in which the insulating phases are explained by the formation of Wigner crystal. Furthermore, evidences of new intermediate phases were reported. All contribute to the further understandings of the puzzle. This review article serves the purpose of summarizing those recent experimental findings and theoretical endeavors, to foster future research efforts.

scholarly journals Superconductor-metal transition in odd-frequency–paired superconductor in a magnetic field

2019 ◽  
Vol 116 (26) ◽  
pp. 12729-12732 ◽  
Author(s):  
A. M. Tsvelik
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Strong Magnetic Field ◽  
Density Wave ◽  
Metallic State ◽  
Wave State ◽  
Pair Density ◽  
Pair Density Wave

It is shown that the application of a sufficiently strong magnetic field to the odd-frequency–paired pair-density wave state described in A. M. Tsvelik [Phys. Rev. B94, 165114 (2016)] leads to formation of a low-temperature metallic state with zero Hall response. Applications of these ideas to the recent experiments on stripe-ordered La1.875Ba0.125CuO4(LBCO) are discussed.

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.

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