Appearance of Successive Phase Transition in SmRu4P12 under High Magnetic Fields Probed by 31P Nuclear Magnetic Resonance

Hachitani, Kenichi; Amanuma, Hideaki; Fukazawa, Hideto; Kohori, Yoh; Koyama, K.; Kumagai, K.; Sekine, Chihiro; Shirotani, Ichimin

doi:10.1143/jpsj.75.124712

Cited by 30 publications

(14 citation statements)

References 20 publications

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“…Furthermore, the spinlattice relaxation rate 1=T 1 measured by NMR 8) is very sensitive to the magnetic fields between T MI and T ? , while it is rather insensitive above T MI .…”

Section: Discussionmentioning

confidence: 99%

“…The À 7 doublet gives no contribution even in magnetic fields as far as the field is small. Therefore, it is enough to consider the T h mixing for only the quartets À 8 and e À À 8 .…”

Section: Dipole Moment In the Ordered Phasementioning

confidence: 99%

“…Namely, some magnetic multipoles higher than the dipole should be involved. Both NMR 8,9) and SR 10,11) experiments detect internal magnetic field below T MI in SmRu 4 P 12 . Recent neutron diffraction experiments also found a clear magnetic superlattice with finite dipole moment on the Sm ions.…”

Section: Introductionmentioning

confidence: 99%

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Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu₄P₁₂Skutterudite–

Kiss

Kuramoto

2009

J. Phys. Soc. Jpn.

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A crystalline electric field (CEF) model of localized 4f 5 electrons is proposed for understanding intriguing ordering phenomena in SmRu 4 P 12 . We take the CEF quartet and doublet (pseudo-sextet) of the Hund's rule ground state with J ¼ 5=2, and include intersite interactions between multipoles by the mean-field theory. The model leads to a multipole order with representation À 5u , and shows the following features: (i) increasing transition temperature T MI with increasing magnetic field; (ii) an anomaly in specific heat and other thermodynamic quantities at lower temperature T ? , (iii) sharpening of the anomaly at T ? as the magnetic field increases. These behaviors reproduce salient features observed experimentally in SmRu 4 P 12 . Possible mechanisms for spontaneous magnetic moment are discussed.

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“…Furthermore, the spinlattice relaxation rate 1=T 1 measured by NMR 8) is very sensitive to the magnetic fields between T MI and T ? , while it is rather insensitive above T MI .…”

Section: Discussionmentioning

confidence: 99%

“…The À 7 doublet gives no contribution even in magnetic fields as far as the field is small. Therefore, it is enough to consider the T h mixing for only the quartets À 8 and e À À 8 .…”

Section: Dipole Moment In the Ordered Phasementioning

confidence: 99%

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Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu₄P₁₂Skutterudite–

Kiss

Kuramoto

2009

J. Phys. Soc. Jpn.

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“…[6][7][8] The interest in these successive phase transitions is a strange H −T magnetic phase diagram. T MI increases with the magnetic field, 9 which is very similar to the system of antiferroquadrupolar ordering such as CeB 6 and TmTe.…”

Section: Multipole Ordering In Smru 4 P 12mentioning

confidence: 99%

Exploring Characteristic Electronic States in Filled Skutterudites by Ultrasonic Measurements –Multipole Ordered State in SmRu₄P₁₂–

et al. 2008

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Filled skutterudites show various interesting physical properties, such as unconventional superconductivity, anomalous magnetism, metal-insulator transition, heavy fermion behavior and so on. We have investigated the multipole ordering state of SmRu4P12 by ultrasonic measurements under extreme conditions of low temperature, high pressure and high magnetic field by pulsed method, so far. Recently, the angle dependence of the elastic constant has been measured. The elastic constant shows interesting and peculiar angle dependence below the metal-insulator transition temperature in the magnetic field. It will enable us to reveal characteristic multipole ordered state in SmRu4P12. In this paper, we will report recent status of the multipole ordered state of SmRu4P12, and discuss the recent results of our elastic constant measurements and the relation to the octupole ordering scenario proposed for this system. KEYWORDS: skutterudite; elastic constant; multipole ordering IntroductionUltrasonic measurement is one of the most sensitive devices for investigating various properties in solids. Elastic strain introduced in solids evokes corresponding lattice distortion and couples with various degrees of freedom such as charge, quadruples and their fluctuation. The symmerized strains have the same symmetry of quadrupoles. Therefore, we can get the charge susceptibility and the quadrupole susceptibility by the elastic constant measurements. Then, the metal-insulator transition and the orbital ordering can be detected. Information on crystalline electric field (CEF) and multipoles higher than rank 2 will be also provided. The elastic strain couples with superconducting order parameter and vortices, so that their static and dynamic properties can be investigated.Ultrasonic investigations under extreme conditions provide us with various important information. We have tried to develop novel and sophisticated measurement methods for the ultrasonic experiments under extreme conditions, so far. They have been applied for the study of SmRu 4 P 12 . Ultrasonic measurement down to 20 mK has been performed using a 3 He-4 He dilution refrigerator.1 Ultrasonic measurements under hydrostatic pressure up to 1.2 GPa 2 and in pulsed magnetic field up to 35 T 3 have been carried out, so far. In this paper, we will summarize present status of the investigations on multipole ordering state in SmRu 4 P 12 , including the review on ultrasonic investigations. Then we would like to show our recent challenge to a new elastic constant measurement.

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“…(iii) Just below T MI , spontaneous internal magnetic field was observed by µSR, NMR measurements. [9][10][11][12] The internal field is dependent on H, which is not explained by a conventional magnetic order due to dipole moments.…”

mentioning

confidence: 99%

³¹P-NMR Study in Single Crystal SmRu₄P₁₂

et al. 2008

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Appearance of Successive Phase Transition in SmRu₄P₁₂ under High Magnetic Fields Probed by ³¹P Nuclear Magnetic Resonance

Cited by 30 publications

References 20 publications

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu₄P₁₂Skutterudite–

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu₄P₁₂Skutterudite–

Exploring Characteristic Electronic States in Filled Skutterudites by Ultrasonic Measurements –Multipole Ordered State in SmRu₄P₁₂–

³¹P-NMR Study in Single Crystal SmRu₄P₁₂

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Appearance of Successive Phase Transition in SmRu4P12 under High Magnetic Fields Probed by 31P Nuclear Magnetic Resonance

Cited by 30 publications

References 20 publications

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu4P12Skutterudite–

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu4P12Skutterudite–

Exploring Characteristic Electronic States in Filled Skutterudites by Ultrasonic Measurements –Multipole Ordered State in SmRu4P12–

31P-NMR Study in Single Crystal SmRu4P12

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Appearance of Successive Phase Transition in SmRu₄P₁₂ under High Magnetic Fields Probed by ³¹P Nuclear Magnetic Resonance

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu₄P₁₂Skutterudite–

Ordering and Crossover in a Pseudo-Sextet Localized Electron Model –Possible Scenario for SmRu₄P₁₂Skutterudite–

Exploring Characteristic Electronic States in Filled Skutterudites by Ultrasonic Measurements –Multipole Ordered State in SmRu₄P₁₂–

³¹P-NMR Study in Single Crystal SmRu₄P₁₂