Deuteron Self-Trapped State and the Strain-Mediated Structural Phase Transition in KDCO<sub>3</sub>

Kanao, Rinna; Nohdo, S.; Horiuchi, Noriaki; Kashida, Shoji; Kakurai, Kazuhisa; Yamada, Y.

doi:10.1143/jpsj.64.2286

Cited by 9 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The population ratio R:L increases discontinuously to 0.5:0.5 and then remains a constant above T c . This transition, supposed to be of the order-disorder type [9][10][11][12][13][14][15][16][17], could be of great significance to experimental studies of the quantum-to-classical interface in the crystalline state. However, structural and dynamical models are still in debate and require further studies.…”

Section: Introductionmentioning

confidence: 98%

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO₃crystal at 340 K

Cousson¹,

Gutmann²

2007

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

We utilize single-crystal neutron diffraction to study the C2/m structure of potassium hydrogen carbonate (KHCO 3 ) and macroscopic quantum entanglement above the phase transition at T c = 318 K. Whereas split atom sites could be due to disorder, the diffraction pattern at 340 K evidences macroscopic proton states identical to those previously observed below T c by Fillaux et al (2006 J. Phys.: Condens. Matter 18 3229). We propose a theoretical framework for decoherence-free proton states and the calculated differential cross-section accords with observations. The structural transition occurs from one ordered P2 1 /a structure (T < T c ) to another ordered C2/m structure. There is no breakdown of the quantum regime. It is suggested that the crystal is a macroscopic quantum object which can be represented by a state vector. Raman spectroscopy and quasi-elastic neutron scattering suggest that the |C2/m state vector is a superposition of the state vectors for two P2 1 /a-like structures symmetric with respect to (a, c) planes.

show abstract

Section: Introductionmentioning

confidence: 98%

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO₃crystal at 340 K

Cousson¹,

Gutmann²

2007

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…KHCO 3 and its deuterated analogue KDCO 3 are typical of materials that exhibit order-disorder phase transitions. They undergo antiferrodistortive phase transitions of order-disorder type at T C , which is at 318 K for KHCO 3 and at 353 K for KDCO 3 [2][3][4][5]. Note the significant isotope effect on the transition temperature.…”

Section: Introductionmentioning

confidence: 99%

NMR study of the order–disorder phase transitions of KHCO3 and KDCO3 single crystals

Lim

Jeong

2006

Journal of Solid State Chemistry

View full text Add to dashboard Cite

“…Critical phenomena have been also thoroughly investigated for the phase transition of KDCO 3 at T cD = 353 K, taking advantage of the larger coherent scattering crosssection of the deuterium atom [12,13,14]. QENS measurements at the superlattice reflection (1, 2, 0) with the high resolution spin-echo technique evidence very slow dynamics (∼ 10 −9 s) above T cD and complete slowing down as T −→ T cD .…”

Section: Discussionmentioning

confidence: 99%

“…The twining-free crystal (≈ 3 × 3 × 3 mm 3 ), previously studied in Ref. [4] was loaded into an aluminum container heated at (340 ± 1) K. This temperature is sufficiently below decomposition (≈ 400 K) to avoid damage, and it is sufficiently high to marginalize critical phenomena [6,8,12,13,14]. The data reduction was carried out with CRYSTALS [21,22].…”

Section: Crystal Structurementioning

confidence: 99%

“…The population ratio R : L increases discontinuously to 0.5 : 0.5 and then remains a constant above T c . This transition, supposed to be of the order-disorder type [9,10,11,12,13,14,15,16,17], could be of great significance to experimental studies of the quantum-to-classical interface in the crystalline state. However, structural and dynamical models are still in debate and require further studies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO3 crystal at 340 K

Fillaux,

Cousson,

Gutmann

2008

Preprint

View full text Add to dashboard Cite

We utilize single-crystal neutron diffraction to study the C2/m structure of potassium hydrogen carbonate (KHCO 3 ) and macroscopic quantum entanglement above the phase transition at T c = 318 K. Whereas split atom sites could be due to disorder, the diffraction pattern at 340 K evidences macroscopic proton states identical to those previously observed below T c by F. Fillaux et al., (2006 J. Phys.: Condens. Matter 18 3229). We propose a theoretical framework for decoherence-free proton states and the calculated differential cross-section accords with observations. The structural transition occurs from one ordered P 2 1 /a structure (T < T c ) to another ordered C2/m structure. There is no breakdown of the quantum regime. It is suggested that the crystal is a macroscopic quantum object which can be represented by a state vector. Raman spectroscopy and quasi-elastic neutron scattering suggest that the |C2/m state vector is a superposition of the state vectors for two P 2 1 /a-like structures symmetric with respect to (a, c) planes.

show abstract

Deuteron Self-Trapped State and the Strain-Mediated Structural Phase Transition in KDCO₃

Cited by 9 publications

References 7 publications

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO₃crystal at 340 K

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO₃crystal at 340 K

NMR study of the order–disorder phase transitions of KHCO3 and KDCO3 single crystals

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO3 crystal at 340 K

Contact Info

Product

Resources

About

Deuteron Self-Trapped State and the Strain-Mediated Structural Phase Transition in KDCO3

Cited by 9 publications

References 7 publications

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO3crystal at 340 K

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO3crystal at 340 K

NMR study of the order–disorder phase transitions of KHCO3 and KDCO3 single crystals

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO3 crystal at 340 K

Contact Info

Product

Resources

About

Deuteron Self-Trapped State and the Strain-Mediated Structural Phase Transition in KDCO₃

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO₃crystal at 340 K

A neutron diffraction study of macroscopically entangled proton states in the high temperature phase of the KHCO₃crystal at 340 K