scholarly journals Magnetic field-driven quantum criticality in antiferromagnetic CePtIn4

2019 ◽  
Vol 116 (41) ◽  
pp. 20333-20338 ◽  
Author(s):  
Debarchan Das ◽  
Daniel Gnida ◽  
Piotr Wiśniewski ◽  
Dariusz Kaczorowski
Keyword(s):  
Magnetic Field ◽  
Tricritical Point ◽  
Condensed Matter ◽  
Quantum Critical Point ◽  
Quantum Criticality ◽  
Transition Line ◽  
First Order ◽  
Experimental Systems ◽  
Quantum Critical ◽  
Second Order Phase Transition

Physics of the quantum critical point is one of the most perplexing topics in current condensed-matter physics. Its conclusive understanding is forestalled by the scarcity of experimental systems displaying novel aspects of quantum criticality. We present comprehensive experimental evidence of a magnetic field-tuned tricritical point separating paramagnetic, antiferromagnetic, and metamagnetic phases in the compound CePtIn4. Analyzing field variations of its magnetic susceptibility, magnetoresistance, and specific heat at very low temperatures, we trace modifications of the antiferromagnetic structure of the compound. Upon applying a magnetic field of increasing strength, the system undergoes metamagnetic transitions which persist down to the lowest temperature investigated, exhibiting first-order–like boundaries separating magnetic phases. This yields a unique phase diagram where the second-order phase transition line terminates at a tricritical point followed by 2 first-order lines reaching quantum critical end points as T→ 0. Our findings demonstrate that CePtIn4 provides innovative perspective for studies of quantum criticality.

scholarly journals Entropic topography associated with field-induced quantum criticality in a magnetic insulator DyVO4

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Dheeraj Ranaut ◽  
K. Mukherjee
Keyword(s):  
Heat Capacity ◽  
Magnetic Susceptibility ◽  
Tricritical Point ◽  
Quantum Critical Point ◽  
Temperature Response ◽  
Quantum Criticality ◽  
Metamagnetic Transition ◽  
First Order ◽  
Quantum Critical ◽  
Magnetic Insulator

AbstractExploration of low temperature phase transitions associated with quantum critical point is one of the most mystifying fields of research which is under intensive focus in recent times. In this work, through comprehensive experimental evidences, we report the possibility of achieving quantum criticality in the neighborhood of a magnetic field-tuned tricritical point separating paramagnetic, antiferromagnetic and metamagnetic phases in a magnetic insulator, DyVO4. Magnetic susceptibility and heat capacity indicate to the presence of a long-range second order antiferromagnetic transition at TN ~ 3.2 K. Field variation of Magnetic susceptibility and heat capacity, along with differential magnetic susceptibility and DC field dependent AC susceptibility gives evidence of the modification of the antiferromagnetic structure below the tricritical point; implying the presence of a field-induced first order metamagnetic transition which persists down to 1.8 K. Further, the magnetic field dependence of the thermodynamic quantity − dM/dT, which is related to magnetic Gruneisen parameter, approaches a minimum, followed by a crossover near 5 kOe to a maximum; along with a hyperbolic divergence in temperature response of dM/dT in the critical field regime. Temperature response of heat capacity at 5 kOe also shows a deviation from the conventional behavior. Entropic topography phase diagram allows tracking of the variation of the entropy, which indicates towards the emergence of the peak at quantum critical point into a V-shaped region at high temperatures. Our studies yield an inimitable phase diagram describing a tricritical point at which the second-order antiferromagnetic phase line terminates followed by a first order line of metamagnetic transition, as the temperature is lowered, leading to metamagnetic quantum critical end point.

scholarly journals Anomalous quantum criticality in the electron-doped cuprates

2019 ◽  
Vol 116 (13) ◽  
pp. 5991-5994 ◽  
Author(s):  
P. R. Mandal ◽  
Tarapada Sarkar ◽  
Richard L. Greene
Keyword(s):  
Low Temperature ◽  
Condensed Matter ◽  
Quantum Critical Point ◽  
Quantum Criticality ◽  
Cuprate Superconductor ◽  
Superconducting Transition ◽  
Critical Fluctuations ◽  
Quantum Critical Phenomena ◽  
Quantum Critical ◽  
Doping Range

In the physics of condensed matter, quantum critical phenomena and unconventional superconductivity are two major themes. In electron-doped cuprates, the low critical field (HC2) allows one to study the putative quantum critical point (QCP) at low temperature and to understand its connection to the long-standing problem of the origin of the high-TCsuperconductivity. Here we present measurements of the low-temperature normal-state thermopower (S) of the electron-doped cuprate superconductor La2−xCexCuO4(LCCO) fromx= 0.11–0.19. We observe quantum criticalS/Tversusln(1/T)behavior over an unexpectedly wide doping rangex= 0.15–0.17 above the QCP (x= 0.14), with a slope that scales monotonically with the superconducting transition temperature (TCwith H = 0). The presence of quantum criticality over a wide doping range provides a window on the criticality. The thermopower behavior also suggests that the critical fluctuations are linked withTC. Above the superconductivity dome, atx= 0.19, a conventional Fermi-liquidS∝Tbehavior is found forT≤40 K.

Magnetic field enhancement of the Hall effect anomalies in quantum critical point CeCu5.9Au0.1

2008 ◽  
Vol 403 (5-9) ◽  
pp. 1268-1269 ◽  
Author(s):  
D.N. Sluchanko ◽  
V.V. Glushkov ◽  
S.V. Demishev ◽  
O.D. Chistyakov ◽  
N.E. Sluchanko
Keyword(s):  
Magnetic Field ◽  
Hall Effect ◽  
Critical Point ◽  
Quantum Critical Point ◽  
Field Enhancement ◽  
Quantum Critical ◽  
Magnetic Field Enhancement

A METAMAGNETIC QUANTUM CRITICAL ENDPOINT IN Sr3Ru2O7

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3258-3264 ◽  
Author(s):  
S. A. GRIGERA ◽  
A. P. MACKENZIE ◽  
A. J. SCHOFIELD ◽  
S. R. JULIAN ◽  
G. G. LONZARICH
Keyword(s):  
Quantum Critical Point ◽  
Point Of View ◽  
Zero Temperature ◽  
Tuning Parameters ◽  
First Order ◽  
End Point ◽  
Fundamental Point ◽  
New Type ◽  
Quantum Critical ◽  
The Magnetic Field

In this paper, we discuss the concept of a metamagnetic quantum critical end-point, consequence of the depression to zero temperature of a critical end-point terminating a line of first order first transitions. This new type of quantum critical point (QCP) is interesting both from a fundamental point of view: a study of a symmetry conserving QCP, and because it opens the possibility of the use of symmetry breaking tuning parameters, notably the magnetic field. In addition, we discuss the experimental evidence for the existence of such a QCP in the bilayer ruthenate Sr3Ru2O7.

scholarly journals First-Order Superconducting Transition near a Ferromagnetic Quantum Critical Point

2003 ◽  
Vol 90 (7) ◽  
Author(s):  
Andrey V. Chubukov ◽  
Alexander M. Finkel’stein ◽  
Robert Haslinger ◽  
Dirk K. Morr
Keyword(s):  
Critical Point ◽  
Quantum Critical Point ◽  
Superconducting Transition ◽  
First Order ◽  
Quantum Critical

scholarly journals Magnetic-Field Induced Quantum Critical Point inYbRh2Si2

2002 ◽  
Vol 89 (5) ◽  
Author(s):  
P. Gegenwart ◽  
J. Custers ◽  
C. Geibel ◽  
K. Neumaier ◽  
T. Tayama ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Point ◽  
Quantum Critical Point ◽  
Quantum Critical

DYNAMICAL PHASE TRANSITION IN THE ISING MODEL ON A SCALE-FREE NETWORK

2005 ◽  
Vol 19 (32) ◽  
pp. 4769-4776 ◽  
Author(s):  
A. KRAWIECKI
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Ising Model ◽  
Tricritical Point ◽  
System Size ◽  
Critical Parameters ◽  
Dynamical Phase Transition ◽  
First Order ◽  
Dynamical Phase ◽  
Wide Range

Dynamical phase transition in the Ising model on a Barabási–Albert network under the influence of periodic magnetic field is studied using Monte-Carlo simulations. For a wide range of the system sizes N and the field frequencies, approximate phase borders between dynamically ordered and disordered phases are obtained on a plane h (field amplitude) versus T/Tc (temperature normalized to the static critical temperature without external field, Tc∝ ln N). On these borders, second- or first-order transitions occur, for parameter ranges separated by a tricritical point. For all frequencies of the magnetic field, position of the tricritical point is shifted toward higher values of T/Tc and lower values of h with increasing system size, i.e. the range of critical parameters corresponding to the first-order transition is broadened.

scholarly journals Bose polarons near quantum criticality

Science ◽  
2020 ◽  
Vol 368 (6487) ◽  
pp. 190-194 ◽  
Author(s):  
Zoe Z. Yan ◽  
Yiqi Ni ◽  
Carsten Robens ◽  
Martin W. Zwierlein
Keyword(s):  
Critical Temperature ◽  
Quantum Critical Point ◽  
Spectral Width ◽  
Quantum Criticality ◽  
Einstein Condensate ◽  
Resonant Interactions ◽  
Bose Einstein Condensate ◽  
Modern Physics ◽  
Quantum Critical ◽  
Bose Einstein

The emergence of quasiparticles in interacting matter represents one of the cornerstones of modern physics. However, in the vicinity of a quantum critical point, the existence of quasiparticles comes under question. Here, we created Bose polarons near quantum criticality by immersing atomic impurities in a Bose-Einstein condensate (BEC) with near-resonant interactions. Using radiofrequency spectroscopy, we probed the energy, spectral width, and short-range correlations of the impurities as a function of temperature. Far below the superfluid critical temperature, the impurities formed well-defined quasiparticles. Their inverse lifetime, given by their spectral width, increased linearly with temperature at the so-called Planckian scale, consistent with quantum critical behavior. Close to the BEC critical temperature, the spectral width exceeded the impurity’s binding energy, signaling a breakdown of the quasiparticle picture.

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