Remanent magnetization in the linear chain antiferromagnet (CH3NH3)Mn1–xMxCl3⋅2H2O, M=Cd or Cu

Paduan-Filho, A.; Becerra, C. C.; Palácio, Fernando

doi:10.1063/1.361916

Cited by 9 publications

(13 citation statements)

References 7 publications

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“…10b as a straight line. The continuity of this line at low temperature, with the experimental points at high temperature, is a robust indication that the theory is sufficiently coherent to allow us to combine results from different sets of experimental data 21,40 .…”

Section: 9 Critical Behavior At the Low Field Transitionmentioning

confidence: 64%

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Bose–Einstein Condensation of Magnons in NiCl 2 -4SC (NH 2 ) 2

Paduan-Filho

2012

Braz J Phys

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A Bose-Einstein condensation (BEC) has been observed in magnetic insulators in the last decade. The bosons that condensed are magnons, associated with an ordered magnetic phase induced by a magnetic field. We review the experiments in the spin-gap compound NiCl 2 -4SC(NH 2 ) 2 , in which the formation of BEC occurs by applying a magnetic field at low temperatures. This is a contribution to the celebration for the 50th anniversary of the Solid State and Low Temperature Laboratory of the University of São Paulo, where this compound was first magnetically characterized.PACS numbers: 75.50.Tt, 75.50.Gg, 75.30.Ds, Macroscopic systems governed by quantum mechanics of interacting particles attract a great deal of interest. Cold atoms and quantum magnets, whose total spin is an integer, have interesting similarities that show the common physics of these two seemingly different realizations 1-11 . All atoms with an even number of neutrons satisfy Bose statistics, which accounts for about 75 per cent of the atoms in the periodic table. Based on the Bose-Einstein statistics a gas of non-interacting massive bosons condenses below a certain temperature T BEC , in which the Bose-Einstein condensation (BEC) occurs. This is a macroscopic quantum phenomenon characterized by spontaneous quantum coherence persisting over macroscopic length and time scales. In dilute atomic gases this phenomenon was realized experimentally for cold atoms. Several quantum spin systems in solids, which show a magnetic-field induced transition, are expected to also show condensation above or below a certain critical field 2,7,12 . Studies have shown that the magnetic system can be mapped non-locally onto a set of weakly interacting bosons on a lattice.The sorting phase can be described as a BEC of bosonic quasi-particles, in which the magnetic field acts to preserve the number of bosons. Therefore, the tuning parameter to induce condensation in spin-ordered systems is not the temperature, but the magnetic field. For particles as well as magnons, a macroscopic number of bosons condense into a single quantum state-the state of lowest energy. The quantum coherence of Bose-Einstein condensation dates back to the prediction of Einstein, based on Bose's work, in 1924.In the diluted BEC the macroscopic wave function is directly connected with the microscopic energy levels, providing a complete description of these phenomena in terms of the Gross-Pitaevskii equation. The concept of a coherent macroscopic matter wave in interacting many-body systems is independent of a detailed microscopic understanding of particles. The intricacies of the many-body problem with interactions that lead to non-separable Hamiltonians are solved by this equation, which introduces effective potentials that are sim-pler than the original interactions, which in turn renders the physical problem more tractable.Experimental evidence of the BEC in confined weakly interacting gases was produced by E. A. Cornell, W. Ketterle, and C. E. Wieman in 1995, leading to a Nobel Prize in 2001. That...

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Section: 9 Critical Behavior At the Low Field Transitionmentioning

confidence: 64%

“…(8) and (12) from different experiments. The continuity of this derivative with the experimental points is very high 40 .…”

Section: J 410 Boson Number Conservationmentioning

confidence: 89%

Bose–Einstein Condensation of Magnons in NiCl 2 -4SC (NH 2 ) 2

Paduan-Filho

2012

Braz J Phys

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“…High fields, up to 70 kOe, were obtained with a superconductor coil and low fields were produced by a copper solenoid. Temperatures below 1.2 K were obtained with a 3 He refrigerator [16,17].…”

Section: Methodsmentioning

confidence: 99%

Weak ferromagnetism in manganese tartrate dihydrate MnC₄H₄O₆·2H₂O

Paduan-Filho

Becerra

2000

J. Phys.: Condens. Matter

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Magnetization and differential susceptibility of manganese tartrate dihydrate were measured in a single crystal from room temperature down to 0.4 K and in the presence of magnetic fields up to 70 kOe. Nearly antiferromagnetic order occurs below TN = 1.83 K, with spins oriented close to the c axis. Sharp peaks in the susceptibility and the presence of a remanent magnetization in the plane perpendicular to the c axis suggest a weak ferromagnetic structure of spins with a canting angle 0.6°. The magnetic phase diagram below TN was determined. The exchange and anisotropy field were obtained respectively as HE = 19.4 kOe and HA = 0.6 kOe.

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“…4,7,8 In the case of diluted crystals of MMn/Cd and MMn/Cu the results, although similar, are more complexes due to the lower dimensionality of these systems. 9,10 A most remarkable feature in the Rb derivative series is the observation of a net magnetization below T N in undiluted crystals of Rb 2 FeCl 5 · H 2 O. Figure 2 shows the temperature dependence of the magnetization for several fields up to 1 Oe.…”

Section: Region Of Low Magnetic Fieldsmentioning

confidence: 97%

“…The materials studied were solid solutions of 9 From herein the formulas of these compounds will be abbreviated to, respectively, Mn/Zn, K-Fe/In, Rb-Fe/In, MMn/Cd and MMn/Cu. Such M r was observed only when the easy axis of antiferromagnetic alignment of the crystal was oriented parallel to the applied magnetic field.…”

Section: Region Of Low Magnetic Fieldsmentioning

confidence: 99%

Impurity-Induced Magnetic Anomalies in the Slightly Diluted Low Anisotropy A₂Fe_1-xIn_xCl₅·H₂O, (A=K, Rb) Antiferromagnets: An Overview

Palácio

Campo

Morón

et al. 1998

Int. J. Mod. Phys. B

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The phase diagram of low anisotropy antiferromagnets contains regions where small perturbations in the structure can induce rich interesting physical phenomenology that is still to be fully understood. This paper reviews the anomalies observed in site-diluted antiferromagnets in two regions of the magnetic phase diagram: the region where the magnetic field is very low, normally less than 10 Oe, and the spin-flop region. Although the observed phenomena is quite general, the magnetic behavior of the solid solutions A 2 Fe 1-x In x Cl 5· H 2 O , (A=K, Rb) is used to exemplify such anomalies.

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Remanent magnetization in the linear chain antiferromagnet (CH3NH3)Mn1–xMxCl3⋅2H2O, M=Cd or Cu

Cited by 9 publications

References 7 publications

Bose–Einstein Condensation of Magnons in NiCl 2 -4SC (NH 2 ) 2

Bose–Einstein Condensation of Magnons in NiCl 2 -4SC (NH 2 ) 2

Weak ferromagnetism in manganese tartrate dihydrate MnC₄H₄O₆·2H₂O

Impurity-Induced Magnetic Anomalies in the Slightly Diluted Low Anisotropy A₂Fe_1-xIn_xCl₅·H₂O, (A=K, Rb) Antiferromagnets: An Overview

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Remanent magnetization in the linear chain antiferromagnet (CH3NH3)Mn1–xMxCl3⋅2H2O, M=Cd or Cu

Cited by 9 publications

References 7 publications

Bose–Einstein Condensation of Magnons in NiCl 2 -4SC (NH 2 ) 2

Bose–Einstein Condensation of Magnons in NiCl 2 -4SC (NH 2 ) 2

Weak ferromagnetism in manganese tartrate dihydrate MnC4H4O6·2H2O

Impurity-Induced Magnetic Anomalies in the Slightly Diluted Low Anisotropy A2Fe1-xInxCl5·H2O, (A=K, Rb) Antiferromagnets: An Overview

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Product

Resources

About

Weak ferromagnetism in manganese tartrate dihydrate MnC₄H₄O₆·2H₂O

Impurity-Induced Magnetic Anomalies in the Slightly Diluted Low Anisotropy A₂Fe_1-xIn_xCl₅·H₂O, (A=K, Rb) Antiferromagnets: An Overview