A magnetic-field-induced irreversible transition in geometrically frustrated antiferromagnetic TbBaCo4O7 with kagome and triangular lattices

2009 ◽  
Vol 35 (12) ◽  
pp. 971-973 ◽  
Author(s):  
A. N. Bludov ◽  
S. L. Gnatchenko ◽  
R. Szymczak ◽  
H. Szymczak ◽  
S. N. Barilo ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Geometrically Frustrated ◽  
Triangular Lattices

scholarly journals Thermodynamic, Dynamic, and Transport Properties of Quantum Spin Liquid in Herbertsmithite from an Experimental and Theoretical Point of View

2019 ◽  
Vol 4 (3) ◽  
pp. 75 ◽  
Author(s):  
Vasily R. Shaginyan ◽  
Alfred Z. Msezane ◽  
Miron Ya. Amusia ◽  
John W. Clark ◽  
George S. Japaridze ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Optical Conductivity ◽  
Inelastic Neutron Scattering ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Theoretical Point ◽  
Geometrically Frustrated ◽  
State Of Matter ◽  
Quantum Spin Liquid

In our review, we focus on the quantum spin liquid (QSL), defining the thermodynamic, transport, and relaxation properties of geometrically frustrated magnet (insulators) represented by herbertsmithite ZnCu 3 ( OH ) 6 Cl 2 . The review mostly deals with an historical perspective of our theoretical contributions on this subject, based on the theory of fermion condensation closely related to the emergence (due to geometrical frustration) of dispersionless parts in the fermionic quasiparticle spectrum, so-called flat bands. QSL is a quantum state of matter having neither magnetic order nor gapped excitations even at zero temperature. QSL along with heavy fermion metals can form a new state of matter induced by the topological fermion condensation quantum phase transition. The observation of QSL in actual materials such as herbertsmithite is of fundamental significance both theoretically and technologically, as it could open a path to the creation of topologically protected states for quantum information processing and quantum computation. It is therefore of great importance to establish the presence of a gapless QSL state in one of the most prospective materials, herbertsmithite. In this respect, the interpretation of current theoretical and experimental studies of herbertsmithite are controversial in their implications. Based on published experimental data augmented by our theoretical analysis, we present evidence for the the existence of a QSL in the geometrically frustrated insulator herbertsmithite ZnCu 3 ( OH ) 6 Cl 2 , providing a strategy for unambiguous identification of such a state in other materials. To clarify the nature of QSL in herbertsmithite, we recommend measurements of heat transport, low-energy inelastic neutron scattering, and optical conductivity σ ¯ in ZnCu 3 ( OH ) 6 Cl 2 crystals subject to an external magnetic field at low temperatures. Our analysis of the behavior of σ ¯ in herbertsmithite justifies this set of measurements, which can provide a conclusive experimental demonstration of the nature of its spinon-composed quantum spin liquid. Theoretical study of the optical conductivity of herbertsmithite allows us to expose the physical mechanisms responsible for its temperature and magnetic field dependence. We also suggest that artificially or spontaneously introducing inhomogeneity at nanoscale into ZnCu 3 ( OH ) 6 Cl 2 can both stabilize its QSL and simplify its chemical preparation, and can provide for tests that elucidate the role of impurities. We make predictions of the results of specified measurements related to the dynamical, thermodynamic, and transport properties in the case of a gapless QSL.

Magnetic-Field Induced Transition to the1/2Magnetization Plateau State in the Geometrically Frustrated MagnetCdCr2O4

2005 ◽  
Vol 94 (4) ◽  
Author(s):  
Hiroaki Ueda ◽  
Hiroko Aruga Katori ◽  
Hiroyuki Mitamura ◽  
Tsuneaki Goto ◽  
Hidenori Takagi
Keyword(s):  
Magnetic Field ◽  
Geometrically Frustrated ◽  
Plateau State

scholarly journals Magnetic field–induced type II Weyl semimetallic state in geometrically frustrated Shastry-Sutherland lattice GdB4

2019 ◽  
Vol 11 ◽  
pp. 100168 ◽  
Author(s):  
W. Shon ◽  
D.-C. Ryu ◽  
K. Kim ◽  
B.I. Min ◽  
B. Kim ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Type Ii ◽  
Geometrically Frustrated

Magnetic-field strengths from optical polarization data

1967 ◽  
Vol 31 ◽  
pp. 381-383
Author(s):  
J. M. Greenberg
Keyword(s):  
Magnetic Field ◽  
Optical Polarization ◽  
Polarization Data ◽  
Term Model ◽  
Source Of Information ◽  
Field Strengths

Van de Hulst (Paper 64, Table 1) has marked optical polarization as a questionable or marginal source of information concerning magnetic field strengths. Rather than arguing about this–I should rate this method asq+-, or quarrelling about the term ‘model-sensitive results’, I wish to stress the historical point that as recently as two years ago there were still some who questioned that optical polarization was definitely due to magnetically-oriented interstellar particles.

Observing the galactic magnetic field

1967 ◽  
Vol 31 ◽  
pp. 375-380
Author(s):  
H. C. van de Hulst
Keyword(s):  
Magnetic Field ◽  
Fair Agreement ◽  
Solar Neighbourhood ◽  
Galactic Magnetic Field ◽  
The Magnetic Field

Various methods of observing the galactic magnetic field are reviewed, and their results summarized. There is fair agreement about the direction of the magnetic field in the solar neighbourhood:l= 50° to 80°; the strength of the field in the disk is of the order of 10-5gauss.

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