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Jang, Hoyoung; Lee, J. S.; Ko, Kyung-Tae; Noh, Woo-Suk; Koo, Tae‐Yeong; Kim, J. Y.; Lee, K. B.; Park, J. H.; Zhang, C. L.; Kim, Sung Baek; Cheong, Sang‐Wook

doi:10.1103/physrevlett.106.047203

Cited by 36 publications

(25 citation statements)

References 28 publications

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“…In addition, our communication reports corresponding results observed with linear polarization. The established magnetic structure for the multiferroic phase of TbMnO 3 is consistent with our data for the first harmonic, as shown in Section 3 [10,14,16]. We report equal amounts of data on the first and second harmonics of the Mn chiral order, which appear concomitantly with the magnetic order at 42 K and persists also in the polar phase appearing at 27 K.…”

Section: Introductionsupporting

confidence: 89%

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Melting of chiral order in terbium manganate (TbMnO₃) observed with resonant x-ray Bragg diffraction

Lovesey¹,

Scagnoli²,

Garganourakis³

et al. 2013

J. Phys.: Condens. Matter

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Resonant Bragg diffraction of soft, circularly polarized x-rays has been used to observe directly the temperature dependence of chiral-order melting in a motif of Mn ions in terbium manganate. The underlying mechanism uses the b-axis component of a cycloid, which vanishes outside the polar phase. Melting is witnessed by the first and second harmonics of a cycloid, and we explain why the observed temperature dependence differs in the two harmonics. Conclusions follow from an exact treatment of diffraction by using atomic multipoles in a circular cycloid, since a standard treatment of the diffraction, based on a single material-vector identified with the magnetic dipole, does not reproduce correctly observations at the second harmonic.

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Section: Introductionsupporting

confidence: 89%

“…The D-M interaction favours orthogonal spins, and it may induce canting of nominally parallel spins deprived of inversion symmetry. In a magnetically-induced multiferroic, such as TbMnO 3 , the presence of a chiral magnetic structure induces polarization by shifting the oxygen atoms [9,10].…”

Section: Introductionmentioning

confidence: 99%

Melting of chiral order in terbium manganate (TbMnO₃) observed with resonant x-ray Bragg diffraction

Lovesey¹,

Scagnoli²,

Garganourakis³

et al. 2013

J. Phys.: Condens. Matter

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“…The Mn magnetic structure of Eu 3/4 Y 1/4 MnO 3 below T C ≈ 28 K has been shown to consist of an A type ab-plane cycloid with a wave vector τ = 1 4 b * in the P bnm orthorhombic unit cell, upon which an F type c-axis sinusoid is superposed through the Dzyaloshinskii-Moriya interaction [28]. The same mechanism is also expected to induce a G type ab-plane cycloid and a C type c-axis sinusoid.…”

mentioning

confidence: 99%

Long-range antiferromagnetic order of formally nonmagneticEu3+Van Vleck ions observed in multiferroicEu1−x
Skaugen
¹
,
Schierle
²
,
Laan
³

et al. 2015
Phys. Rev. B

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We report on resonant magnetic x-ray scattering and absorption spectroscopy studies of exchange-coupled antiferromagnetic ordering of Eu 3+ magnetic moments in multiferroic Eu 1−x Y x MnO 3 in the absence of an external magnetic field. The observed resonant spectrum is characteristic of a magnetically ordered 7 F 1 state that mirrors the Mn magnetic ordering, due to exchange coupling between the Eu 4f and Mn 3d spins. Here, we observe long-range magnetic order generated by exchange coupling of magnetic moments of formally nonmagnetic Van Vleck ions, which is a step further towards the realization of exotic phases induced by exchange coupling in systems entirely composed of non magnetic ions. The interplay between local spin and orbital magnetic moments is an important factor in a large variety of magnetic ordering phenomena exploited in present day applications. In special cases, even with magnetic moments present, a system can form a nonmagnetic singlet ground state. Prominent examples are rare-earth and transition-metal ions with the f or d shell missing one electron for half filling. Here the orbital and spin moments can cancel out generating a J = 0 ground state. However, having only a small energy spacing between the ground state and the first magnetic triplet state, magnetism can in such systems be generated by symmetry breaking external stimuli such as magnetic or electric fields. In the case of magnetic stimulus this is known as Van Vleck magnetism and offers fascinating possibilities for new applications, for example for a magnetic sensor that is itself nonmagnetic. From a more fundamental point of view such systems are candidates for a variety of novel states of matter characterized by hidden order [1], Bose-Einstein condensation, or quantum phase transitions [2,3].A paramount example of a formally nonmagnetic ion being susceptible to external magnetic fields is the Eu 3+ ion with S = 3 and L = 3, having a J = 0 nonmagnetic ground state. Van Vleck magnetism has long been known to contribute to the paramagnetic moment of Eu 3+ [4][5][6][7]. For this ion, the symmetry breaking by an external magnetic field mixes the 7 F 1 state into the ground state, yielding a finite magnetic moment. A more recent example of this mechanism is the observation of x-ray magnetic circular dichroism (XMCD) in EuN under an applied magnetic field of 5 T, which is explained by magnetic field induced admixture of 7 F 1 into the 7 F 0 ground state [8]. The possibility of spin ordering without external electric or magnetic stimulus in the case of a vanishing total magnetic moment has been discussed theoretically, setting up the possibility of an unconventional phase transition in which the spin correlation length diverges but there is little or no change in the magnetic properties [9]. * joerg.strempfer@desy.de While these previous studies revealed the presence of Van Vleck magnetic moments, experimental proof of intrinsic long-range magnetic order of Van Vleck ions is missing. The perovskite-structure rare-earth (RE) manganites R...

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“…Resonant soft x-ray diffraction (RSXD) [14] has been used in recent years to study the magnetic ordering in multiferroic single crystals of o-REMnO 3 with, e.g., RE ¼ Tb [15,16] and RE ¼ Dy [17], and in films of RE ¼ Y [18]. RSXD is element selective, allowing one to directly probe the Mn 3d (magnetic) states due to a transition from the 2p 1=2 , 2p 3=2 to the 3d states at the Mn L 2;3 absorbtion edges.…”

mentioning

confidence: 99%

Multiferroic Properties ofo−LuMnO3Controlled byb-Axis Strain

Windsor

Huang

et al. 2014

Phys. Rev. Lett.

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Strain is a leading candidate for controlling magnetoelectric coupling in multiferroics. Here, we use x-ray diffraction to study the coupling between magnetic order and structural distortion in epitaxial films of the orthorhombic (o-) perovskite LuMnO(3). An antiferromagnetic spin canting in the E-type magnetic structure is shown to be related to the ferroelectrically induced structural distortion and to a change in the magnetic propagation vector. By comparing films of different orientations and thicknesses, these quantities are found to be controlled by b-axis strain. It is shown that compressive strain destabilizes the commensurate E-type structure and reduces its accompanying ferroelectric distortion.

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Coupled Magnetic Cycloids in MultiferroicTbMnO3andEu3/4Y1/4

Cited by 36 publications

References 28 publications

Melting of chiral order in terbium manganate (TbMnO₃) observed with resonant x-ray Bragg diffraction

Melting of chiral order in terbium manganate (TbMnO₃) observed with resonant x-ray Bragg diffraction

Long-range antiferromagnetic order of formally nonmagneticEu3+Van Vleck ions observed in multiferroicEu1−x
Skaugen
¹
,
Schierle
²
,
Laan
³

et al. 2015
Phys. Rev. B

Multiferroic Properties ofo−LuMnO3Controlled byb-Axis Strain

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Coupled Magnetic Cycloids in MultiferroicTbMnO3andEu3/4Y1/4

Cited by 36 publications

References 28 publications

Melting of chiral order in terbium manganate (TbMnO3) observed with resonant x-ray Bragg diffraction

Melting of chiral order in terbium manganate (TbMnO3) observed with resonant x-ray Bragg diffraction

Long-range antiferromagnetic order of formally nonmagneticEu3+Van Vleck ions observed in multiferroicEu1−xSkaugen1, Schierle2, Laan3 et al. 2015Phys. Rev. B

Multiferroic Properties ofo−LuMnO3Controlled byb-Axis Strain

Contact Info

Product

Resources

About

Melting of chiral order in terbium manganate (TbMnO₃) observed with resonant x-ray Bragg diffraction

Melting of chiral order in terbium manganate (TbMnO₃) observed with resonant x-ray Bragg diffraction

Long-range antiferromagnetic order of formally nonmagneticEu3+Van Vleck ions observed in multiferroicEu1−x
Skaugen
¹
,
Schierle
²
,
Laan
³

et al. 2015
Phys. Rev. B