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Sb, Oseroff; Cheong, S. W.; Aktaş, B.; Mf, Hundley; Fisk, Z.; Lw, Rupp

doi:10.1103/physrevlett.74.1450

Cited by 194 publications

(124 citation statements)

References 26 publications

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“…Investigations have concentrated on systems where Cu atoms were replaced with Zn [14][15][16][17][18][19] or Ge was replaced with Si. [20][21][22] It is now well established that a new antiferromagnetic (AF) ordered phase appears at low temperatures in both Zn-doped 14,19 and Si-doped 22 samples.…”

Section: Introductionmentioning

confidence: 99%

Spin-Peierls and antiferromagnetic phases in Cu1−xZnxGeO
Martin
¹
,
Hase
²
,
Hirota
³

et al. 1997
Phys. Rev. B

116

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Comprehensive neutron scattering studies were carried out on a series of high-quality single crystals of Cu 1−x Zn x GeO 3 . The Zn concentration, x, was determined for each sample using Electron Probe Micro-Analysis. The measured Zn concentrations were found to be 40-80% lower than the nominal values. Nevertheless the measured concentrations cover a wide range which enables a systematic study of the effects due to Zn-doping. We have confirmed the coexistence of spin-Peierls (SP) and antiferromagnetic (AF) orderings at low temperatures and the measured phase diagram is presented. Most surprisingly, long-range AF ordering occurs even in the lowest available Zn concentration, x=0.42%, which places important constraints on theoretical models of the AF-SP coexistence. Magnetic excitations are also examined in

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Section: Introductionmentioning

confidence: 99%

Spin-Peierls and antiferromagnetic phases in Cu1−xZnxGeO
Martin
¹
,
Hase
²
,
Hirota
³

et al. 1997
Phys. Rev. B

116

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“…For instance, it has been shown that the contributions to the susceptibility from doping-induced impurity spins in spin-Peierls systems at low temperatures deviate heavily from the Curie-law behaviour one would expect for purely exponentially decaying correlation functions 15,21 . Other examples are the transition to an ordered antiferromagnetic phase, the Néel phase, occuring at unexpectedly high temperatures [21][22][23][24] , and the temperature dependence of the specific heat in these materials 21 .…”

mentioning

confidence: 99%

“…For specific compounds and doping conditions, certain predictions of the model, such as phase transitions or long-range ordering, have been experimentally tested, either by the measurement of macroscopic quantities 22,24,25 or by scattering techniques 23,[26][27][28] . However, some configurations are difficult to investigate experimentally, such as the impact of boundaries 29 or spatial variations in the coupling or dimerization strength.…”

mentioning

confidence: 99%

The random mass Dirac model and long-range correlations on an integrated optical platform

et al. 2013

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Long-range correlation-the non-local interdependence of distant events-is a crucial feature in many natural and artificial environments. In the context of solid state physics, impurity spins in doped spin chains and ladders with antiferromagnetic interaction are a prominent manifestation of this phenomenon, which is the physical origin of the unusual magnetic and thermodynamic properties of these materials. It turns out that such systems are described by a one-dimensional Dirac equation for a relativistic fermion with random mass. Here we present an optical configuration, which implements this one-dimensional random mass Dirac equation on a chip. On this platform, we provide a miniaturized optical test-bed for the physics of Dirac fermions with variable mass, as well as of antiferromagnetic spin systems. Moreover, our data suggest the occurence of long-range correlations in an integrated optical device, despite the exclusively short-ranged interactions between the constituting channels.

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“…The SP transition is evidenced by a kink at T SP in the magnetic susceptibility and is clearly revealed by X-ray and neutron scattering 2 . A unique feature of this compound is that the effect of impurities can be studied by substituting impurity ions (Zn, Mg and Ni) for the Cu sites [3][4][5][6][7][8] and Si for the Ge sites 9 . These substitutions all induce a strong decrease of T SP and the appearance at lower temperature (T < T N < T SP ) of a three-dimensional AF phase.…”

Section: Introductionmentioning

confidence: 99%

Electron spin resonance of Ni-dopedCuGeO3in the paramagnetic, spin-Peierls, and antiferromagnetic states: Comparison with nonmagnetic impurities

Grenier

Monod²,

Hagiwara

et al. 2002

Phys. Rev. B

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We have performed Electron Spin Resonance measurements on single crystals of the doped spinPeierls compounds CuGe1−ySiyO3 and Cu1−xMxGeO3 with M = Zn, Mg, Ni (x, y ≤ 0.1). The first part of our experiments was performed in the paramagnetic and spin-Peierls phases at 9.5, 95 and 190 GHz. All non-magnetic impurities (Si, Zn and Mg) were found to hardly affect the position and linewidth of the single line resonance, in spite of the moment formation due to the broken chains. In contrast to Si, Zn and Mg-doping, the presence of Ni (S = 1) at low concentration induces a spectacular shift towards high fields of the ESR line (up to 40% for x=0.002), together with a large broadening. This shift is strictly proportional to the ratio of Ni to Cu susceptibilities: Hence it is strongly enhanced below the spin-Peierls transition. We interpret this shift and the broadening as due to the exchange field induced by the Ni ions onto the strongly exchange coupled Cu spins. Second, the antiferromagnetic resonance was investigated in Ni-doped samples. The frequency vs magnetic field relation of the resonance is well explained by the classical theory with orthorhombic anisotropy, with g values remarkably reduced, in accordance with the study of the spin-Peierls and paramagnetic phases. The easy, second-easy, and hard axes are found to be a, c, and b axes, respectively. These results, which are dominated by the single ion anisotropy of Ni 2+ , are discussed in comparison with those in the Zn-and Si-doped CuGeO3.

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Spin-Peierls State versus Néel State in Doped CuGeO3

Abstract: Spin-Peierls state versus Néel state in doped CuGeO3.

Cited by 194 publications

References 26 publications

Spin-Peierls and antiferromagnetic phases in Cu1−xZnxGeO
Martin
¹
,
Hase
²
,
Hirota
³

et al. 1997
Phys. Rev. B

Spin-Peierls and antiferromagnetic phases in Cu1−xZnxGeO
Martin
¹
,
Hase
²
,
Hirota
³

et al. 1997
Phys. Rev. B

The random mass Dirac model and long-range correlations on an integrated optical platform

Electron spin resonance of Ni-dopedCuGeO3in the paramagnetic, spin-Peierls, and antiferromagnetic states: Comparison with nonmagnetic impurities

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Spin-Peierls State versus Néel State in Doped CuGeO3

Abstract: Spin-Peierls state versus Néel state in doped CuGeO3.

Cited by 194 publications

References 26 publications

Spin-Peierls and antiferromagnetic phases in Cu1−xZnxGeOMartin1, Hase2, Hirota3 et al. 1997Phys. Rev. B

Spin-Peierls and antiferromagnetic phases in Cu1−xZnxGeOMartin1, Hase2, Hirota3 et al. 1997Phys. Rev. B

The random mass Dirac model and long-range correlations on an integrated optical platform

Electron spin resonance of Ni-dopedCuGeO3in the paramagnetic, spin-Peierls, and antiferromagnetic states: Comparison with nonmagnetic impurities

Contact Info

Product

Resources

About

Spin-Peierls and antiferromagnetic phases in Cu1−xZnxGeO
Martin
¹
,
Hase
²
,
Hirota
³

et al. 1997
Phys. Rev. B

Spin-Peierls and antiferromagnetic phases in Cu1−xZnxGeO
Martin
¹
,
Hase
²
,
Hirota
³

et al. 1997
Phys. Rev. B